Even higher quality is the documentation and preparation done by Ralph. 5 at mid tap. Four of them are +- left and right channels. At the heart of Stefan's control-board (Srefan also offers a relay-board and an extension control-board if you want to listen to 5. Feb 3, 2008 · In the mean time I'm very happy with the original Pass D1 "line up" of 8412/5842 but I would like to address the lack of reclocker on the D1V3. Per our last emails, I was sending you an F7 for review. For the full range speakers I also use a BSC (1mH + 8ohm). 97v Voltage across 390R drain IRF9610 is 4. Cool, huh? :) This is made for IRFP420, or a similar Mosfet that has a Vgs in the 4V range. If you have ONE driver and want a high pass filter then add a capacitor in series. Ever since I joined the forum and finding the Pass Labs section Nelson Pass's amp designed have intrigued me and became a thing of great desire. Mar 5, 2018 · FS: Nelson Pass A40 PCBs UPDATE: a new batch of PCBs arrived! See post #17 below for photos of a bare PCB, post #28 for the schematic, post #33 for photos of a sample build. I am using it to drive my luxman l-58a that I am using as a power amp. May 12, 2010 · Hi everybody, this is a special request, as the gallery section of the passdiy is no longer available for the moment, if you have build an Nelson Pass amplifier can you post pictures of it. The seller told me that the unit is only 6 months old but I would like to check this information. "Gentlemen, my apologies. Dec 11, 2023 · The PCB we used for post #177. 5v not 15v as nelson pass recommended. , $12 Apr 17, 2013 · Here you will find a build guide for the Pass / Firstwatt F4 power amplifier using PCBs and chassis from the DIYaudio store. Dec 11, 2023 · Doing some more listening after a modest upgrade to the shared Universal PS board. com Dec 11, 2023 · Generally speaking, any of the Firstwatt amplifiers are going to be a notable and significant upgrade to any of the ACA amplifiers. Nov 16, 2016 · From BAF 2015 diy amp with IXFN Schade 50 in single-ended have DF= 12. 3V, not the +/- 17 that I'm supposed to see. Go to Products and scroll down nearly to the bottom; it's listed under the preamps. Nov 7, 2002 · Hello all, I am about to begin construction of an Aleph 5. 2. 5. Aug 21, 2009 · This is how i have done it in my F2 clone. NuTube website; Nelson Pass' original article; B1K thread on diyAudio; B1K product page in the diyAudio Store Jun 26, 2014 · Greetings, I have a Pass Aleph P (original non-remote) that I am using that has too much gain. Jan 4, 2018 · diyAudio provides this forum for the convenience of our members, but makes no warranty nor assumes any responsibility. The next email arrived July 22nd. 8v Voltage acroos 220R in upper 9610 is 4. Aug 27, 2021 · Hi, I decided to build another AB Amp and will offer the PCB‘s (layout by Prasi, 2oz Cu…) and many of the needed parts. Supplier: A-Series White Toggle Circuit Breaker - Single Pole10A - Blue Sea Systems Second-third Image: ATC Semitec PEPI Thermostat PEPI Thermostats and Thermal Protectors | ATC Semitec Fourth-fifth image: mains power entry connector (plug) with Emi/Rfi filter Aug 16, 2002 · It is easy to see what the bean counters at Adcom were thinking, "we can sub the C2344/A1011 for those expensive Motorola parts Mr. if anyone wants i can share eagle files / gerbers. 9VDC, R9,10 approx 5VDC, Z1,2=9VDC. I feel I don't need the extra complexity and cost of the remote control on the P1. Which version of the F5T are you interested in? A stereo F5T v2 in a 5U chassis will cost considerable less than 100W mono blocks v3 in a 5U chassis'. It's as jellybean a part as one could be imagined. Upper diode before base stopper 68R, lower diode after base stopper 68R. So I did and plotted the Mar 21, 2013 · Thanks to a nice person on the Pass Labs Forum ( www. Feb 21, 2005 · All, I am intrigued by the following Pass products seem to have and would be very interested in building an excellent (read best bang for buck) pre-amp. I am on standby for the 2SD2014 to become available again which will act as the 2SD2081 replacement - so the Darlington's will be the 2SB1257/2SD2014 combo as per suggestion. Last edited: 2022-11-29 8:48 pm Jan 22, 2018 · They have nothing to do with gain and everything to do with oscillation. The same holds for a Linkwitz-Riley high-pass, except that you need to invert the polarity when the order is not a multiple of Sep 30, 2022 · I want to try these 100Hz high pass filters with my full range speakers (TABAQ with 4FE32) in a 2. My other amplifier is a First Watt F4, factory made. 7 or the Zen balanced line stage preamplifier. 5 Ohms) and in burn-in test (24 hours at max power - 18Vpeak, driven with 10khz sine wave and loaded with RCL combo of 3. Feb 27, 2012 · The BrianGT schematic shows the negative side of C1 being connected to R9 and R10, and the positive side to C4, R15, and R11. I am using Revel M20's that are 87db at 6ohms. Power output is not an issue as long as it sounds good. May 12, 2010 · My holiday of diyAudio projects has continued! I tried in vain to troubleshoot and revive a B1-ish contraption I built previously that had an annoying hum. C101,102 ,C4-104,C3-103 2x220uf but pcb isn't compatible. the cone (and air load) moving up and down, causing strong vibration to the whole base, efforts on isolating that from floor and other Nov 16, 2016 · The question as to what truly constitutes Class A operation has been re-examined since 1975, and most of the designers I have talked to agree that an amplifier is still Class A when both polarities of the output stage have significant current and both are contributing to the output signal. 2 from the rig, pending an all expenses-paid trip back to the factory where Wayne himself will be going through everything from top to bottom, and re-installed the Pass X1. " and when those 1. No data yet, but there's a description and pictures of the unit, both inside and out. Feb 8, 2023 · diyAudio provides this forum for the convenience of our members, but makes no warranty nor assumes any responsibility. 5 Ohms) temperature on MOSFETs never rose more than 26 degrees Celsius above ambient, so I think it's Nov 4, 2021 · Nelson Pass said: The DIY ACA mini (Amp Camp Amp mini) is in the process of shipping to the Burning Amp Festival lottery winners and a few of the helpers and associates. I'm looking forward to getting together with him again. Jul 20, 2006 · Explanation would be welcome I would like to understand N. Works Oct 18, 2019 · Good afternoon! I am building a balanced version of the F5 turbo. 2009-08-28 12:21 am #13 Jan 3, 2017 · Pass has been kind enough to open source many of his designs which sound at par if not better than amps costing thousands of dollars , be it high end Munich or many such hifi Expos the price of equipment at display is ridiculous and to think that under the hood they all are using a commodity transistor albeit carefully matched makes it too hard May 21, 2023 · Drilling and tapping by hand is pretty labor intensive. Pass Labs HPA-1 headphone amplifier | Stereophile. Hum was diminished slightly, but is still present. Jan 11, 2019 · The shorting pins did nothing to resolve the hissing issues in my new preamp. If I connect a new equipment, I first listen either there is a backround noise or any kind of irregular gain other than beryllium tweeters hisssss. But I think the more gain the better, so the Cs should work great. Mar 9, 2002 · Oldie, but a goodie. 5A parts didn't work "maybe there was a reason Mr. I had another project that got in the way. Centre is 1. This is a beautifully simple Oct 20, 2009 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi This is the single depletion mode Mosfet amp that Nelson Pass demonstrated at Burning Amp Jan 22, 2007 · Or maybe somebody else would know how to figure out what you want to know:-----Second Hand Pass Labs X150. my electrical engineering study experience went no further than high school level. Pass used an 8A part, let us try this 5A 100V part, I mean the rails are only +/- 80V, right? Feb 17, 2008 · Hi, I recently built a pair of Pass J-Low's. Joined 2001. Today I removed the Pass Labs X0. 22uf snubber cap was a suggestion from Wayne, he did a bunch of testing and found that value to give the most benefit in a single cap. Jun 19, 2019 · Referencing DIYAudio store chassis'. Jun 27, 2013 · I found some Denon POA-4400A Monoblocks. the deep slot forms a strong 1/4 W. Perhaps a short description of each and what that Jul 9, 2023 · The Pass SIT was a production run of one batch, and sadly the fab that made them went out of business a year or so later for completely unrelated reasons. Any schematics would be appreciated. Then I though why not paring one BL and one GR to get a Idss 14mA device. S. Another advantage to the TO-247 is that you can screw it to the heatsink without using an isolator for the screw. We do not vet any members. As you might have noticed, there are 5 tiny wires coming from the arm to the rca jacks. Jan 22, 2018 · Hello everyone! I (potentially stupidly) decided to make the WHAMMY my very first electric project, and I'm a little stuck. Am doing my best to keep the DIY section of the Review Magazine going and am always open to publishing projects (pres, amps, speakers, etc). However, some say the significant cost difference isn't equal to the gain in sonic improvements (the law of diminishing returns is a constant in the high-end audiophile world). I installed the boards on my prototyping chassis configured to handle the FirstWatt standard +/-24V power and a subset of the Universal Mounting Spec heatsink Jul 12, 2013 · After finishing the pass labs pearl 2, designed by wayne at pass labs, and falling head over heels in love with records, i couldn't help but want to build a matching preamp/control deck to pair with it and my turntable. Feb 18, 2023 · While testing and waiting for NP FE 2022, I bought bunch of Toshiba 2SK209GR and BL. Pass used and save a ton of money. That is what makes the heatsinks at the store a good deal. I also finally got around to doing at least one hopefully meaningful measurement of it. I assumed the schematic was correct and the boards were wrong, but based on Brians's post you Mar 22, 2014 · Sound of various Pass designs Nelson, It would be interesting to know your thoughts on how the Sony VFET amps sounded vs the Pass SIT amp vs the current (and maybe past) Pass 240 based products, the F series and maybe even the Aleph sound. Luckily, it is very possible to build an F5m that sounds really great using standard F5 PCBs plus the Universal PS board. The other Filter is a High Pass that feeds the Treble driver. com. Apr 3, 2014 · The diyAudio universal PSU v3 was made with the requirements of this very amp when it was designed. 2 from the diyAudio store. Are they a Nelson Pass design? If working nice are they a good buy for €~300,00 each?! (They include 23% VAT Oct 5, 2018 · I have some Altec 604-8g coaxes in 620 kabinet clones as reserve and will test active crossovers on them and either use a combination of Pass clones and tube amps ( I have se300b and two pairs of pp pentode monoblocks to play with) or two clones to drive them, if active suits the 604s. Jun 16, 2021 · IRF9610 are all matched as per nelson pass circuit but my power supply gives me 14. May 12, 2010 · Walter, et al: It was great meeting Tom (6sX7) yesterday; we had a nice time chatting and listening. This is unseen! Also the questions asked about building this Jan 22, 2018 · Given the explosion in the popularity of headphones, as well as the unbelievable amount of choice and variety in the market, it seemed that a simple and great-sounding headphone amp would be a great addition to the DIY community. My collection of vinyl has generally only been played about three times since my practice was to record albums onto cassette tape. Mar 21, 2013 · In today’s marketplace, audio power amplifiers are conventionally viewed as voltage sources, delivering a given voltage at the output that is a multiple of an input voltage. However i am concerned that 10 Ohms series resistance does not reduce the inrush current enough. I listen to CD’s and computer downloads and ripped CD’s using a Mac mini and Audirvana. I'm currently on step 12 of the build guide, and I'm only reading +/-2. )? Just trying to figure out what Pass considers the best approach for headphone amplification. + and - Reg VDC at 51. Jan 22, 2018 · 7800/7900 series regs are more than 50yr old now. i am using a 625VA toroid and when i checked the resistance across the primary winding including the series CL60 Mar 9, 2002 · For those interested in crossovers, the XVR1 crossover is now listed on the Pass Labs website. (SIT-1, -2, -3. ) My initial guess is that something might be going-out with the protection circuit, and I'm assuming this will affect both sides when tripped (an old Yamaha car-amp I once fixed worked that way). It will help me and others to get inspiration for designing our amplifiers. Illustrated build guide for the BA-3 amplifier (With complimentary output stage) The “Burning Amplifier” series is a selection of modular amplifier pieces designed by our technical, spiritual, and menu advisor, Nelson Pass. Long story short, life got in the way, had a kid, and I Jan 20, 2012 · OK, so after some pushing by a friend who wanted a Pass B1 for less than the $1k retail price, I agreed to build him one. My questions are: Was the Pearl 1 a MM version? Any chance of those boards being available? Is it possible to convert the Pearl 2 This is the build guide for the Korg Nutube B1. However, I also want to make a preamp for this unit. Sep 1, 2011 · Just a heads up DIY guys as Nelson Pass penned a DIY speaker project and i just posted it. The 22k resistor along with the gate capacitance of the jfets is the input low pass Jan 22, 2018 · Oscilloscope testing revealed oscillating problems. Nov 21, 2022 · I've been chipping away at the preliminary schematic for this updated circuit, and here are the changes I've been making so far: 1) Darlington for upper VAS stage 2) Alternate feedback circuit for unity gain DC feedback using film cap instead of tantalum 3) Discrete vs. b) You can copy Nov 16, 2016 · It is a very simple amp that had surprising performance, however it is the intellectual property of Pass Labs, and so remains under wrap. Thanks! JojoD Step 1 The Nelson Pass 6-24 crossover. Much better success. ••• Dec 3, 2021 · It's been a while, but I finally have the PSU 99% finished. Edit - it's Conrad heat sinks, and I may have the double flange version. 59v IRF240 are all matched to 3. Which offers the best audio performance, which is the most Apr 12, 2008 · As many of you know, the F5 power amplifier design is done and is merely awaiting delivery of the issue of AudioXpress which was scheduled to be mailed April 10. Jan 31, 2023 · Hi all, Over a long period I built a XONO 2019 with boards, documentation and help from RSTaudio (Ralph Stens). I am still working on the best way to incorporate some motor run caps into the power supply. R6/R7 voltages trimmed to ~530mv. 6 Two channel Chassis in the diyAudio Store. Customers can post any issues in those threads as long as it is done in a civil manner. ••• Jan 12, 2012 · The . The 5th wire is supposed to be connected to the arm by a screw to discharge any static electricity buildup. For the sub-woofer I am using a cheap Ali active low pass filter specifically for subs, but no high pass for the full rangers yet. So this is going to be the first publication from me for a project from start to finish. As to the positive feedback, the modulation is similar to "muting" the cascode. Dec 11, 2023 · Hey TonyEE, Maybe it is unfortunate that you missed the window to get the special F5m boards. The unit was pretty hot at 780mv, and probably okay, but I dialled back down because 25-30W/ch is plenty for these speakers (88dB sensitivity) in a smallish room. The old datasheets are still quite valid. . IRF9610 I used are all matched to 3. The amplifier is powered from a laboratory source + -30V. This build utilizes the v3 circuit board and the kit of circuit board parts available from diyAudioStore. Mr Pass has 1uf mylar bypasses on the supply rails right next to the active circuits in the GFP-750 preamp but there are none on the GFA-5800 amplifier channel pcb supply rails. I am in the middle of a DIY project with a Nelson Pass A40 Power Amplifier. Dec 11, 2023 · And the Pass F5m that I built a while back has been the instrument of choice for judging the upgrades to convert a Rega P3-24 into something more P6-like. 1 or 7. resistors and some caps are smd 1210 . Check it out. An illustrated guide to building the diyAudio PSUv3 can be found here - diyAudio Power Supply Circuit Board v3 illustrated build guide Jul 20, 2006 · C3 (bias capacitor) changed from 220uF to 2200uF. 5mm thick sheet aluminium, finished in hammerite green. Jan 10, 2001 · Hexfets for Aleph 3 To-3's dissipate heat the best because of the metal can, the To-247 come in second I think because of it's size. So much so I'm considering moving up to the X0. to get acquainted with the project. etc. That's why i ask if it's ok to use 470uf. His F4 sounded terrific as well. If you want a low pass filter then add an inductor in series. I Sep 10, 2018 · X250: Stripdown, Clean, Recapping and Schematic creating First image: Unusual Main switch: Single Pole White Toggle Circuit Breaker. 6v DC offset at May 24, 2024 · Final button-up completed. I will tell you this so that you can reverse engineer it: Three stages, DF is about 700, high current, high slew, . Intrigued, I decided to build myself one as well to go with a little 2050 Sure May 4, 2012 · I have found lots of info online how to make high pass filters, so let me cut to the chase - a 2nd order (12db/octave) high pass filter @ 500hz (for an 8ohm driver) is what I want to build. First read Nelson Pass’ article on Amp Camp Amp #1 if you haven’t already: Amp Camp Amp #1 Another great guide can be found here - Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. 7, however I May 11, 2013 · A 2way crossover is TWO filters combined, One Filter is a Low Pass that feeds the Bass driver. 2. 1 sound) is a PIC18F4550 µProcessor designed by the "Microchip" company. When that failed I changed course to put a DCB1 Hypnotize board and donut in that chassis, instead. Feb 9, 2016 · Scott: I just rebuilt my Maplenoll turntable. You can check them out… More Dec 11, 2013 · ACA March 2018 Build guide can be found here: ACA (v1. Attachments NELSON PASS M2-REV1. Aug 14, 2009 · (BTW, this amp is after the hi-pass side of an x-over - not used as a full-range amp; an MA-2070 handles the lows. I'm not sure whether to make an Aleph P1. 1) Illustrated Build Guide ------- An illustrated guide to building the Nelson Pass 'Amp Camp Amp'. png Aug 6, 2022 · hi fellows, have been reading the original A75 publish and got a few questions wondering if i can find consultation here. Avel Lindberg 5A tranny, Panasonic TSU electrolytics, polyproplyne coupling caps, Vishay-Dale resistors , Clarostat volume controls, Grayhill selector switch, gold input output RCA'S, Detachable IEC power cord, ofc hook up wire. (Model PS-12) Of course you could use the Super Regulator V2. DIY audio-wise, have successfully assembled and run AMB β22 singled-ended and balanced in Feb 5, 2007 · Others may choose Pass 2. I develop a kind of interest May 12, 2010 · Not quite a PASS amp yet but will hopefully be part of it. The F5m is proving to be a good match for my speakers. The price is $10 per pair of boards plus shipping. Pass Labs Tubes / Valves Chip Amps Class D Power Supplies Headphone Systems May 2, 2008 · I think Mr Pass and KBK both have valid points. Patrick Jul 17, 2019 · Context: Loudspeakers - Spatial Audio M4 Triode Masters, linestages- Supratek Chardonnay w/ 6SN7 tubes and Pass diy ba-3. Pass M2 amp with 2SK /2SJ fets. Attachments 45932494_2347086195333466_6892676594519769088_n. I have a Pass Pearl 2 phono premp that I built several years ago. I've read through all the build threads, the reviews, etc. I feel that it's important to support AudioXpress, a magazine with which I have a 35 year history, and which also serves as a Sep 22, 2013 · Hi Experienced diyers I have ready on the table pcb's for F4,F5 and AlephJ amps with components but first timer like me esitate about choice to make for pure and solid connections on pcb with solder and between psu,rca,speakers with wire. The top and the base are made of cast aluminium. 2K are in series with the signal hots. The input circuitry and the power driver circuitry are shown in the diagrams. Jul 21, 2020 · Dear Nelson Pass, Great thanks for this new publication ! You write there : If your speakers are not perfect, then this is just the beginning of the process, as the driver frequency response and phase shift are additional unwanted elements in the crossover. com Do we know anything about the design? Push-Pull or single-ended? Based on any currently known topology (Aleph, etc. Still, any thoughts on the First Watt B-5 Verses the VXR-1 in post #59? -David Aug 31, 2013 · An illustrated guide to building the Aleph J This is a guide to building the Nelson Pass / Firstwatt 'Aleph J' amplifier. I kept a log on another forum and I figured I might aswell post the information and pictures here too, as it might be of use for somebody also wanting to build them. And, I will be using a Betsy driver with a Eminence Kappa-15LFA 15" Low Frequency Driver 8 Ohm for the woofer, crossing over at 100HZ. Dec 3, 2021 · I had thought originally to put 2x UPS boards within the power chassis and send umbilicals up. You could go with a single power supply in the F5T v2, but dual-mono is better. resonance, deep notch filter is needed if you play it up to midbass. For my part, I have compiled an index of the articles that I think are necessary for understanding the Pass amplifiers, including Zen Variations and First Watt. I found VERY different schematics for the "same" circuit, depending on what website I looked at. All diyAudio rules about conduct apply and will be enforced. The input pots P100 & P200 completely ruin the balanced impedance on the input side. but you can probably macgyver that. I have just gone through the list of resistors on the parts list and am Apr 9, 2021 · Here is a version of Mr. 5 and be happy with it. TO-220 comes in third. 5 there was a noise like a ''servo regulator'' is working nearby my listening room. What is need for DF = 700 ? ps: from specifications DF=200 Jan 30, 2020 · Confronted with this challenge, Pass Labs’ design team decided that each of the Xs Phono three pairs of inputs had to have its own separate, directly connected stereo phono stage. Daniel Jun 21, 2014 · Schematic of signal circuit. 1 bi-amped setup with a sub. The Pass SIT has never been available in any product other than the various Firstwatt SIT amplifiers. Nov 30, 2016 · Pass' new HPA-1 is certainly getting good press. First push today was to see if I could just get it to work. I know you don't dispense praise lightly. Some small variation is allowed through, but it works to slightly decrease the voltage across the JFET on the negative output swing and increase it on the positive, running counter to the natural tendency of the transconductance to increase at higher current and Jun 5, 2010 · Thanks Jacco, yes, 3 pairs per channel seems thin, but it's all I got right now Nevertheless, amp drives happily my speakers (Canton ct-1000 and Epos M5 which go down to 3. if you connect 4 ohms to an 8 ohm crossover the resulting slope will change and does not result in a "clean" filter anymore. Aug 29, 2021 · Yes this is awesome, the proud owner seems to be located in Buenos Aires Argentina and he has a few Pass Labs jewels in his system. Paid Member. 69v Voltage across 9v diode in upper IRF9610 is 8. com ), I became aware that high current power JFET transistors are again available. Apr 11, 2010 · Here is my recommendation: Its author is Stefan Dreyer, a German. diyaudio. the series inductor will provide attenunation at a lower frequency and the parallel cap will only "shunt" higher Sep 1, 2011 · I've tried a similar one, with 2 problems: 1. Pass statement If you put a large cap across the bias transistor and reversed diodes from the + and - of that cap to the output it will tend to kill the turn on thump. however you bought up OnSemi, and their "MC" 7800/7900 series regs are 100% compatible, but looking at her not insignificantly better performance, it's safe to say they are a newer (and likely different) design. Nov 17, 2018 · Greetings. Apr 17, 2013 · I'm confused because shematic is a bit strange. Any project needs to start with a good PSU - this is an Antek 20+20V shielded transformer, and 317/337 linear regulator PSU from Tubecad. Depends on a few things. By optimized pairing, I got few precision marched 2 quad BL and 2 quad GR for LTP with Idss 19mA and 10mA. 00x% distortion, 40 uV output noise, big Class A envelope, 25 watts into 8, 100 watts into 2. Jun 15, 2024 · Wired as a . But SLLXO I have no idea, Dave is the expert there But it's so much cheaper and easier to do it in the digital domain Apr 23, 2011 · Here in the Pass forum, a few folks (myself included) are new, and hoping to find a decent starting point. The luxman is rated at 100w at 8ohms (biased in class A most of the time). With pass 2. Aug 18, 2017 · Is it possible to reduce the supply voltage of ZEN V9, eventually remove the cascoding to obtain a low power (1-2W) good sounding class A JFET amp? I need it to drive medium/tweeter compression driver with 120dB sensitivity (600hz to 20Khz) 16ohm, so only 1 or 2 high quality low distortion and Feb 8, 2019 · Hello all, new forum member here. L. :snail: EDIT: For current boards marked "V0R1" please find the changes and additional information in post Sep 10, 2007 · Hi, I currently own the Pass X1 and find it excellent in many ways. CLS should definitely address all of Mr Pass' concerns about cabling and such. This is a group of photos overviewing the basic steps necessary to build a DIY Firstwatt / Nelson Pass F5 Class-A amplifier. Measured voltages across R7,8 = . The pieces can be mixed and matched, used with a range of PSU voltages Jul 3, 2014 · After a quick blessing from our technical, spiritual, and menu advisor, Nelson Pass, I am glad to present the preliminary discution for the diyAudio Mosfet F6. December 30th, 2007 After building the Cyburg Stick and Buschhorn I've really Oct 5, 2006 · Hi guys, I have some IRFP240/IRFP9240 leftovers from an F1 project, I was hoping I can build a simple class ab amp out of a single pair. 2 A ) Temperature of heat sink during long listening session - 50-55C. Wayne's been working Jan 11, 2023 · Greetings. I am pleased to present the DIY ACA mini article here (in two parts as it exceeds the size limit of the forum). moreover, all the thick aluminum chassis also takes part of heat. The 5U 'BIG Amp Chassis' is shown, because that's the one I have. Negative feedback= 18 open loop= 38dB. I'm waiting on delivery of a tentlabs VCXO but have begun building a slightly modified version of the reclocker shown in the D1 service manual. Feb 7, 2015 · Greetings, I'm a long time lurker and with the big help of another DIYAudio member I am getting a LOT of help building an F5T amp with the volume control and source selector built into the amp as well. Estimated USPS shipping prices are $5 for the continental U. 5 and a pass to the other speakers; so 2 in and 2 out but only one box, I could have done it as a second order but not cheaply. Thanks in advance. The first opamp I tried the LME49720 oscillated slightly with any compensation value (C2&C7) so I removed them and add a 100nF decoupling caps to the opamp supply and to the 7815/7915 input pins. Jun 17, 2015 · Some news from 6 Moons about F7. passdiy. This forum is to discuss the challenges and success in building a copy of the aleph p for personal enjoyment and education. There are no switches or relays in the signal paths to the hugely important first amplification stages. On my boards (revision 0744, see photo above) the positive terminal of C1 connects to R9, which is the opposite of the schematic. The big Mar 30, 2008 · In the past, I have published the odd schematics of projects that I have built, plus the odd photos. If you do this, the volume control of the amplifier for the low frequency system's amplifier would act like a bass control, but not a very good one. That's what Wayne did on an earlier PCB and it worked perfectly. jpg Nov 12, 2009 · Owen, I have an idea to make a modular design between your pcb & ACKO's Sabre DAC board - here's my post from the Buffalo tweakers thread in response to qusp wishing that the tweakers board had something to plug into it by which I assumed he meant an output stage: I have an idea about that - basically to allow output boards to be plugged in from the top into the tweakers board using standard Jul 27, 2015 · Ideally, the design of the low-pass filter and the high-pass filter would be done together, and ideally taking into account the capabilities of all the speakers used. Just stick one end of the resistors into the input pads and attach your signal wires to the other end, so the 2. I have a tough criteria when I evaluate components. Use of this facility is at your own risk. Jul 21, 2020 · I am thinking about building an open-baffle speaker(s) per the Pass slot example on this site. It will fit comfortably in a 4U 'Jack of all chassis' and have enough heatsink as well. Now I'm doing the tuning. I present the DIY FRONT END 2022. Shipping is from Germany. Nelson's article is at: The Slot Loaded Open Baffle Project Article By Nelson Pass ••• Mar 20, 2022 · passive filter for such a low crossover is usually not ideal - i suppose you could get a cheap class D amp with active crossover for not much more money. Chances upon this (not that I was looking for an arc welder) 70 years old, beautifully designed and extremely well constructed 9KVA arc welder. A few disclaimers first : a) All the information I have to offer is as published. They would sit close to each other the two, but the idea is a modular pass system so we can enjoy various builds without having to invest in redundant parts, larger chassis, etc. However, I notice that there are several designs out there (BOZ, etc). I payed around 96€ for the parts and 16€ for the PCB‘s that is also the price for this offer (plus shipping). In the positive arm of the amplifier, 8 pairs of transistors and Aug 27, 2009 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. For a myriad of reasons, including voltage swing, current delivery, and clipping behavior. Jan 11, 2002 · The "ion cloud loudspeaker" used photocopy machine ionizing nichrome wire strung in a flat array a bit like a window screen, but with more space between the wires, and charged to a variable DC potential of about 10 KV. diyAudio provides this forum for the convenience of our members, but makes no warranty nor assumes any responsibility. Pass DIY Apprentice. integrated output Darlingtons to avoid having to use obsolete integrated devices 4) Current mirror loading for input diff Jul 12, 2013 · After finishing the pass labs pearl 2, designed by wayne at pass labs, and falling head over heels in love with records, i couldn't help but want to build a matching preamp/control deck to pair with it and my turntable. 2k 3W was chosen as a bleeder because (yep, you guessed it…) I had them on hand - that value is used as a bleeder in Pass power amps. A few links to start off - Nov 8, 2021 · Hey all, A few years ago I started modifying a Harman Kardon Citation 12 per Nelson Pass’ article. With a 240v supply and 10 Ohms series resistance (ignoring the resistance of the primary winding for now) the inrush current is 24 Amps. Dec 11, 2023 · Based on the circuit shown by Papa at the BAF 2023, I have built the F5m using easily modified DIYAudio Store F5 boards from long ago. The bag of transistors is sorted before packaging, so that the transistors work in any spot if the included resistors are stuffed in the spots marked 'bias'. If you purchase the predrilled heatsinks, you can attach the output mosfets with little wire leads as I showed in a previous post as the holes won't match your amplifier boards. May 12, 2010 · Do these heatsinks really suffice? /RK:confused: These radiators are enough (ok, for hot summer day would be too small, but the bias is set to 1. tv. This one will drive any headphone you want to throw at it. Jun 30, 2012 · Original article by Nelson Pass: Amp Camp Amp #1 _____ Info for Amp Camp Kit (updated by Moderators) Here's the ORIGINAL step by step photo build guide: ACA illustrated build guide A new Build Guide for the V1. The amp has some age and was outputting a distorted sound so I decided to overhaul it and re-cap it etc. Ah one - i was going to use Wima films and Nichicon for power supply and Nichicon Gold for electrolytics on Pearl pcbs . Nov 30, 2016 · The 992/1845's I used were on the borderline between B & C for the BC550/560. Nov 24, 2008 · Hi, Pass Bride of Zen preamp in Par-metal gold rack case,. Nov 21, 2022 · I'll have to take a closer look to see if a pass through a milling machine may provide a better mounting service. Feb 8, 2011 · Here is the test setup: Running unbalanced with no signal source attached at this point in the test. Dec 11, 2023 · Featured Vendors The diyAudio Store Parts Connexion miniDSP DIY HiFi Supply. Nov 30, 2016 · The FQP parts as well as KSA/KCA are on their way plus some spares. Mar 19, 2015 · EDIT: And after what has been a long, long time, and at least three revisions, PCB are now available here - WHAMMY Headphone Amplifier – diyAudio Store Well illustrated build guide here - "WHAMMY" Pass DIY headphone amp guide Just to create some interesting discussion, here is a preview of the new PassDIY headphone amp. Upper and lower diode different position. Jan 16, 2022 · Thankyou Ben 👍 maybe some more questions as i progress . Grey Jul 18, 2024 · The reason why it works is that a Linkwitz-Riley low-pass filter of order 2n and an all-pass filter of order n with Butterworth poles both have exactly twice the phase shift of a Butterworth low-pass filter of order n. Nov 5, 2010 · I am not a good source of reliable information for balanced feeds, so check for corroboration. plus i have ended up from 220uf when i have plenty of 470uf/50V. Sep 14, 2005 · Thank you. I love it! I would like a version that would work for Moving Magnet cartridges. First of all, the boards are very high quality. ldanzgkpoqmxmueaxvkd