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Muffsy schematic



Oct 27, 2012 · 34 thoughts on “ Making A Phono Preamp For A First Electronics Project ” Tom Brusehaver says: October 27, 2012 at 10:02 am The cool thing about this circuit, with a simple RC circuit on the Sep 22, 2019 - Schematic for the Muffsy Phono Preamp PP-4 / PP-3 Rev A (single channel) Mar 13, 2015 · From left to right, it’s going to have a grounding connector (which may or may not be needed depending on whether there is a humming noise – note that the humming noise can sometimes be removed by unplugging your record player, turning the plug around and then plugging it back in [assuming it’s symmetrical]), left output RCA jack, right output RCA jack, left input RCA jack, right input The Muffsy Relay Input Selector is a simple, reliable, high quality, DIY stereo input selector that's controlled by an ESP-32 and is slightly larger than a Post-IT note. com. 1 as I’ve fixed some minor niggles with the prototypes. Power Supply Schematic - Groovewatt Tube (Valve) RIAA Phono Preamp. Forum entuzjastów płyt winylowych Phono Tube Amp Schematic More phono preamp circuit diagram on Google search: Modified Audionote M7 vacuum tube. This is the praemp kit as you get it, photo courtesy of Muffsy. Schematic. Unless a typo, the resistor for the LED is 100uF, assuming the correct LED. In the first instance, brother is using a CNC (sachu version) with a 24 volts single rail polycom phone regulated powersupply wired with the same logic. Jan 28, 2016 · Golden Middle: DIY Hi-Fi tube preamp- phono stage. Moreover, it turns out Håvard is a system administrator and does this “kit thing” as a side gig. The original schematic that Jim posted is not the exact schematic of this PCB board. com) listing what you want, and I'll send you a Paypal invoice for the total. By making the assumption of an ideal op-amp, we reduce the problem to one of finding the R and C values of the feedback network which has a transfer function that's the reciprocal of equation (1). After many hours of listening I am extremely pleased with the sound. com • hostalriano. The Muffsy tries to accomodate many different cartridges by making input impedance and gain configurable. Rauscharmer Phono Verstärker mit LT1115, Phonopre, Phono Pre, Phono, Phonovorstufe, DIY, LT1010, Operationsverstärker, Eigenbau, selbst bauen, selber bauen Big List of 250 of the Top Websites on Riaa. txt) or read online for free. com/shared_projects/2HFzUaPt PPMS_LCC32v3_Type3_AC transport_resistivity_mod. Jan 17, 2018 · They offer some really amazing kits, complete with specs, schematics, examples and all kinds of wonderful code and instructions for the tinkering. Simple Pre-Amp with One Transistor This is a very simple pre-amp circuit which use a pre amp. Schematic: Muffsy Phono Preamp PP-3. The Muffsy kits are available on Tindie, with the Muffsy Phono Preamp starting . php(143) : runtime-created function(1) : eval()'d code(156) : runtime-created function(1) : eval Rauscharmer Phono Verstärker mit LT1115, Phonopre, Phono Pre, Phono, Phonovorstufe, DIY, LT1010, Operationsverstärker, Eigenbau, selbst bauen, selber bauen Big List of 250 of the Top Websites on Riaa. After researching I found the muffsy. He may have based his calculations based on the LED's he has and sent. The schematic: So, we have an excellent little filter here that suffers from a lack of precision parts selection. The schematic to the right shows the stuffing guide for the hybrid tube/MOSFET headphone amplifier. small clone schematics. The big advantage that this kit has over the Pro-Ject Phono Box SE is the ability to adjust the gain. I know I can choose the capacitance of the phono cables but my bigger question is with the Muffsy itself. Small Clone - Free download as PDF File (. With over 40 years of experience, our company is an established value in the development of electronic kits, instruments and modules and it markets an extensive range of consumer and do-it-yourself products. I'm an electrical engineer and can read schematics. I built the Bugle without a PCB, just used perf board and the schematic. The speaker switch is to prevent switch on and off pop. For example, for testing the 834p that many in the forum have built this would not give us very reliable results. pdf), Text File (. Or would you consider selling a build-it-yourself kit or schematics? Phono preamps are a fun way to get into the DIY audio world. RIAA equalization is a specification for the recording and playback of tonepad_offboardwiring - Free download as PDF File (. Schematic for the Muffsy Phono Preamp PP-4 / PP-3 Rev A (single channel) Complete information and build instructions at http://muffsy. The preamplifier is the device that has always attracted me, from a "circuitry" point of view. All kits come with every necessary component, except the enclosure and AC wall adapter. This kit is meant to be paired with a preamplifier circuit, such as the Muffsy BSTRD Class-A Tube Preamp, Pass Labs B1 and many others. After having purchased some Russian 4P1L tubes from a vendor in Russia about six or seven years ago, I finally got around to building a rough prototype preamp using an existing chassis with a suitable power supply already in place. eu RIAA equalization - Wikipedia wikipedia. A complete, detailed schematic will appear in Copper #22, along with a source for finished circuit boards and a link to a Digi-Key shopping cart to simplify purchase of parts. es • komitart. This would be equally useful for the CNC designs here on LH as well as most others designed for both MM & MC cartridges. Oct 21, 2019 · I followed the troubleshooting guide from Muffsy as per below pics: The power supply is all fin and all values are in order. brd https://oshpark Small Clone - Free download as PDF File (. How big are the boards? The board measures 3. While overcoming the dreaded flu and before the soldering iron has another chance to attack me during the construction of a Project 88 PreAmp, I was on the Beavis HiFi site looking for a solution for my "POP" ing JFET PreAmp. The "Laplace"-thingie is the inverse RIAA input signal. 2. Last updated on Oct 1 2019. blogspot. They supply positive polarity (+Vcc) as well as negative polarity (-Vcc, not connected to ground!) and grou eimis is a member of Headphone Reviews and Discussion - Head-Fi. com This is the PSU as you get it, photo courtesy of Muffsy. In this project we construct a dual power supply circuit to convert 220V AC supply in to +12V and -12v DC supply, that is why it is named Dual Power Supply as we get positive and negative 12v power supply at the same time. However, to upgrade, the only option is a standalone external unit and there are several options available to go about it, new, used or DIY/kit (for DIY, this simply means one can home-brew the entire thing through a schematic, which can entail etching their own circuit boards to using terminal strips and sourcing all the necessary components hi the most advanced diy phono riaa amps are for MC MM is a bit easier to build as requires less gain Some would say a transistor discrete riaa amplifier is the way to get less noise and good result. Send me an email (Richard Murdey, rjm003. I’ve had many hours of fun building and tweaking projects consisting largely of their components. Jag noterar att: AT95 har den anpassats ordentligt m h a 47k och 100p? Eller borde den ha en annan belastning? Kopplingen är i stort sett invändningsfri för t ex TL072, som har FET-ingång och alltså inte drar nämnvärd ström genom PUn, medan en 5532 behöver en hel del biasström, vilken då i huvudsak kommer via PUn. es • xn--hostalriao-19a. com for bestilling av få kort. This is the offboard wiring part of the circuit that is omitted in the project page. eu I had the amplifier kit, the power supply kit, the back-panel kit (all from Muffsy), the case (from a very efficient supplier in China), the temperature-controlled soldering station, and the wall wart (from a very efficient supplier in California). I contacted “the person behind Muffsy,” Håvard Skrodahl, with some questions. SCHEMATIC FOR THE DEPTH I had the amplifier kit, the power supply kit, the back-panel kit (all from Muffsy), the case (from a very efficient supplier in China), the temperature-controlled soldering station, and the wall wart (from a very efficient supplier in California). com • galeriaagyak. com • tubeguru. (dang, I was only off by 1mm in the one direction) This is the place for ordering kits, boards, and parts for various projects featured on my web site. The noise floor of the Muffsy Phono Preamp PP-3, powered by the Muffsy Hifi Dual Power Supply, is well below -100 dB. This is one of the power amplifier has an output power is high. DIY guitar pedal wiring https://oshpark. To filter out these ripples, capacitor of 2200 uf, 25V is used. hu • galeriaepites. V-MODA Crossfade Limited Edition Over-Ear Noise-Isolating Metal Headphone (Matte Black) Potente amp com Oct 17, 2016 · Anybody else built the 'Muffsy' phono stage? skrodahl replied to catman 's topic in DIY Audio Projects Hi, The resistor on the output was fixed about four years ago, the schematic shown is very outdated. Single-Ended Line Stage Preamp Modules. Article about our Vertex 3D Printer which was published Posted on 02/16/15. Visit the Muffsy Home Page for even more resources. ). Shop for Turntable Pre-Amps and Accessories with Richer Sounds for expert advice and lowest prices guaranteed. The output of the rectifier circuit that is DC contains the ripples in the output voltage. 925” x 1. Hi Frits, yes, the power supply delivers 5V for DAC+XO and +/-15V for the analog output stage. I had the amplifier kit, the power supply kit, the back-panel kit (all from Muffsy), the case (from a very efficient supplier in China), the temperature-controlled soldering station, and the wall wart (from a very efficient supplier in California). The NJM2068 is a wideband opamp with reasonable slew rate and (up to 30mA) a reasonably symmetrical output with enough current to drive a capacitive feedback loop and is therefore a sensible choice for a phono stage. The "Laplace"-thingie is  All project files are available on this Hackaday. V2 RAMS HEAD BIG MUFF PI - This is an original EHX schematic dated October 15, 1975. I not sure anyone other than the designer will be able to give the exact reason but I can try to “guesstimate” the answer. 2: the schematics, drawn with FidoCadJ. Sep 19, 2018 · G'day all, thank you for all comments. If I understand its internal schematic correctly, I could connect both stereo sources (Bluetooth audio / cable connection) to just this one relay, and then let that relay switch between them as needed? The thing is, it says it's got a switching current of 1A. The inherent inductance of these early magnetic hifi phono carts reacted with the my values are typical to many 12AX7 phono preamp schematics:. Use this wiring when a DPDT bypass switch is used and status LED is not required. Click. In the second instance, I have tried it with regulation only using 7815 and New Electronic Gadgets Electronic Kits Electronic Engineering Hobby Electronics Electronics Projects Electronics Gadgets Audiophile Speakers Hifi Audio Audio Box. DIY guitar pedal wiring Jeg anbefaler pcbway. This kit is meant to be paired with a preamplifier circuit, such as the Muffsy BSTRD Class-A Tube Preamp, Pass Labs B1 and many 1N914 (shown on the schematic) and 1N4148 are some modern equivalents that work, but they may not be identical to the original diodes. Offboard Wiring 1. I have built robots in the past but they had turned out to be more cumbersome than expected. Here are the best websites we found: riaa. The Muffsy Phono Kits are complete hifi kits for record players for all cartridges. The phono stage was the last piece to the puzzle and since my amp was home built from scratch i didn't want to "just buy a phono stage. Provide your own chassis, power supply, and connectors. he brought it! The Muffsy Phono Preamp PP-3 comes as a kit that you can order on Tindie, that includes everything needed to build a complete phono stage. With its no-nonsense, straight forward design that focuses on both performance and cost, this project caters to audiophiles and music lovers alike. The Muffsy kits are available on Tindie, with the Muffsy Phono Preamp and the Muffsy MC Head Amp starting at $89. Off Board Wiring - Free download as PDF File (. Certainly my own builds are quiet and whilst passive equalisation can be problematical the 'Muffsy' appears to be well designed overall. Sep. es • gometropro. The time constants T 1, T 2 and T 3 are specified by the RIAA. 100+ Head-Fier, from EU This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Phono Tube Amp Schematic - WordPress. What is the status of the boards? The board file is v1. DIY Push-Pull (PP) KT120 Tube Amplifier with a 12SL7 driver stage. Rev. DIY Hifi Phono Stage. . 438. Download Minecraft maps and projects shared by Minecrafters! Browse the largest collection of Minecraft Maps! Become a member and share your Minecraft maps! Diy Phono Preamp Schematic (0 children). SCHEMATIC FOR THE STEREO MOD Use the pads on the main PCB and wire this circuit: 22k. The layout provides pads for this mod, just follow the schematic for the depth switch. Printed Circuit Boards for the Muffsy BSTRD Tube Preamp and Power Supply Diy Phono Preamp Schematic Read/Download Complete electronic schematics of phono/cd/aux preamp. Phono Preamp Schematic Phono Preamp I don't have to make it long you can pause the video anyway. See more ideas about Audio amplifier, Circuit diagram and Circuit. 3a) see #3 but measure at the He does not have the schematic for the PP4 as yet, but the dual power supply is there. Re: Battery powered DIY CNC phono stage Great points, it works. When I disconnect the phono stage from the turntable, while the phono stage (muffsy) is connected with pre and power (no turntable is connected with phono stage muffsy) it is making huge hum sound. Sound - DIY Moving Magnet (MM) RIAA Phono Preamp Kit. Jan 09, 2016 · Otherwise the basic schematic and the component values remain the same as the original Muffsy. The input capacitance of the Muffsy is listed as "optional" and the only info I can garner from the maker (who is otherwise very helpful) is that I can add input capacitors to the PCB up to 200pF. Serves about amplifier circuit schematic diagram you can search here and many more electronics project, power amplifier circuit diagram. io/project/18624-muffsy-constant-current-led-tester. Welcome to what appears to be the first I was fortunate to receive a new phono cartridge for Christmas. To make it do anything useful, you need to complete it with a power supply, cables and connectors, and an enclosure. From my understanding, the schematic that was posted in copper was pulled from the LM4562 datasheet that the CNC is based on. 000 Hz is -107. Just two JFETs in each channel and a simple RIAA equalization network comprise the preamp. Minimalist audiophile circuit using the legendary 2sk170 JFET Passive (no feedback) RIAA equalization ~40dB gain Russian K40Y and K42Y paper in oil coupling capacitors Nichicon Muse filter capacitors Vishay/Dale CMF60 resistors Audiophile quality American made PCB Requires external 12-24VDC Kit includes circuit board and all components. Phono Tube Amp Schematic More phono preamp circuit diagram on Google search: Modified Audionote M7 vacuum tube. Click on the picture to view a high resolution version. 047µF caps were Apr 13, 2017 · Otherwise the basic schematic and the component values remain the same as the original Muffsy. Apr 05, 2016 · Phono Preamp Build / April 5, 2016 by Ryan Morrison For those of you looking for a high-quality phono preamp, I have discovered a fantastic preamp kit from Muffsy . Perfectly capable of troubleshooting both hardware and software and I don't work on my own gear. Notice: Undefined index: HTTP_REFERER in C:\xampp\htdocs\pqwqc\5blh. I have built the Muffsy and the Hagerman Bugle (not the Bugle 2). The average of all measured points, from 20-20. A new phono preamp kit called the Trio will take its place for DIYers. But when I test the phone stage as shown in pic 2 I get on all 4 points -15 Volts which I totally don’t understand. He responded very quickly, and we ended up having a most delightful conversation. Some of you may have heard of, read and/or bought The Tube Preamp Cookbook, reviewed by But the FVP design with its Phono Stage in tact is not dead. Any hack can dig in and change parts and modify audio equipment - nothing wrong with it as long as it's not my gear. I figure this is the same as an A/B speaker switch and it works for me. You must have a background. org. There are two empty slots, which appear to be for film caps on the PCB designated for this. An Improved AudioKarma CNC Phono Stage. A Raspberry Pi B+ and Audiophonics I2S DAC will be added to the top of the case, upside down at a later stage. Gerbers are available for free if you want to make your own PCBs. Follow. I didn't even know that, I just followed the muffsy design which called for 2 rails. Welcome to what appears to be the first complete phono “CNC” Moving Magnet Cartridge Phono Stage Part 2 By Darren Myers In a previous issue , Jim Langley shared his famous DIY CNC phonostage with us, recommending various component modifications and upgrades. org/wiki/RIAA_equalization. a lot of gain Mar 05, 2016 · I am currently using a self built and tweaked Hagerman Cornet 2 which is tube based. The Muffsy Phono Preamp PP-2 has improved upon this circuit: The PCB is 40% smaller than the original size. Most interesting. tonepad_offboardwiring - Free download as PDF File (. 45” (app. wikipedia. 1 Sep 2018 Hi Fi Phono Preamp Schematic A relay circuit protects sensitive hi-fi components from voltage spikes The Muffsy Phono Preamp PP-2 is… 16 Sep 2016 and like any good open hardware project, [skrodahl] has made the schematic, https://hackaday. If you have selected ±15V operation, then resistor R13 = 3R9 and R10 = 7R5. Ne5532 Op Amp Review Small Clone - Free download as PDF File (. tonepad_offboardwiring Small Clone - Free download as PDF File (. 9 Jun 2015 Here is the schematic for the Muffsy Phono Preamp PP-3. Curryman requests a Linear Regulated Power Supply with +15/-15VDC outputs for the analog output signals but the miniSHARC and input side of the CurrymanDACs only need a +5VDC switch mode power supply which is basically just a wall wart that will output the required amps for all the boards running off the Basic schematic of three stage power amplifier; BJT Quasi-Complementary 5 Watt amplifier; Class A Audio Amplifier; Class B 10 Watt with Darlington TIP121 TIP127; Crossover Elimination on a complementary BJTs couple with Feedback; Full Course in Designing Three Stages Audio Power Amplifiers; Gilmore ClassA Headphone Amplifier; Hiraga Amplifier Aug 23, 2017 - Explore soelikin936's board "wer" on Pinterest. 2005. The Muffsy BSTRD - Class A Tube Preamp PCBs from muffsy on Tindie. 11 dB (2 kHz). 1N914 (shown on the schematic) and 1N4148 are some modern equivalents that work, but they may not be identical to the original diodes. Schematic for the Muffsy Phono Preamp PP-3 Rev A Building the Muffsy Phono Preamp PP-2: This instructable is outdated, visit Muffsy Home Page for Muffsy PP-4. The Muffsy Hifi Dual Power Supply is one of the winners of a Stickvise! Used together with the Muffsy Phono Preamp PP-2 or the new PP-3, it has only Here's the schematic for the power supply, should you want to build it on breadboard:. The differences are minor, but diode types do affect the sound frequencies that are clipped. The phono stage, power source, and back panel can be purchased individually or as a complete kit for $100. " I'd have preferred to have build my own from a schematic, but due to the sensitivity of a phono stage I decided on a kit. LEDs seem to accumulate. What a lovely present! And of course, there is great pleasure (or, I suppose, great frustration, depending on one’s point of view) in all the tinkering required to remove the old phono cartridge, mount the new one, and correctly set things up. Previous Log  24 Mar 2015 Below are the schematics for the Muffsy Phono Preamp PP-2, complete with all component values: Visit the gallery for a larger version, or use  Schematic for the Muffsy Phono Preamp PP-3 Rev A. . On the Muffsy website he suggests that most people will not need to add capacitors as their tone arm wires and cables should provide enough in themselves and so does not include any caps for this purpose. ru • pueblodelapuerta. Note: The schematic above should be considered preliminary. The Big Muff Pi is a distortion/sustain guitar pedal designed by Bob Myer and Mike Matthews in 1969 and mass produced in 1970. 100 x 37 mm. Schematic for the Muffsy Phono Preamp PP-4 / PP-3 Rev A (single channel) LTSpice Simulation: Muffsy Phono Preamp PP-4 / PP-3 Rev A. Aug 09, 2016 · The Muffsy BSTRD – Valve Preamp Although Morgan Jones speaks about an AC fed RIAA stage, he presents a schematic for the regulation of the heater supplies for Phono Preamp Schematic Phono Input An Improved AudioKarma CNC Phono Stage. The original small clone had a depth switch instead of the potentiometer, this gave two depth options only. Page 6- New phono stage kit, the Muffsy PP4 project Turntables and Vinyl Tapeheads Tape, Audio 15V supply section in the schematic. 74 dB and the highest single harmonic is at 92. and asked "Santa" for it. tonepad_offboardwiring Re: Battery powered DIY CNC phono stage Great points, it works. Complete your build with the power supply and the back panel. The BHL kit uses the same topology as the "Le Pacific" circuit with some changes. https://en. This LTSpice simulation of the Muffsy Phono Preamp uses LT1792 and LT1037 that are quite similar to the OPA2134/LM4562 combo. The value T 4 is the extra time constant discussed earlier. Med Hong Kong Post pleier det å bli under hva man må betale toll for. io project page: https://hackaday. Dear Frits, You need a linear regulated power supply that outputs +15, -15 and +5 VDC. Det koster $10 for 10 prototypekort (100x100 mm eller mindre). 1 KHz sample rate with 16-bit depth, some people are still riding the vin… Article about our Vertex 3D Printer in the Belgian newspaper. This is great, but I just . Sep 16, 2016 · While compact disks are seeing an uptick in popularity thanks to a convenient format that offers a lossless high-quality 44. Several versions and reeditions were released over the years. A project log for Muffsy Phono Preamp PP-3. New Electronic Gadgets Electronic Kits Electronic Engineering Hobby Electronics Electronics Projects Electronics Gadgets Audiophile Speakers Hifi Audio Audio Box. Valve Phono Amplifier. The VPS dual input valve phono Muffsy Phono Kits - Schematics. brd PPMS_LCC32v3_Type3_AC transport_resistivity_mod. BTW: It might seem overly complicated that an additional +/- supply is necessary compared to the ES9023 alone or other single supply DACs. So far the weakest link in my chain is my phono pre. What it does not provide is support for moving coil (MC) cartridges. May 22, 2016 · +Vcc, –Vcc (Positive and Negative polarity) and Gnd Dual power supply units are common equipment in electrical engineering and electronics. Secondly, output of this transformer is given to the rectifier circuit, which will convert the ac supply into dc supply. The Muffsy Phono Preamp PP-3 is a hifi pre-amplifier for vinyl turntables with MM and high output MC cartridges. They can be. This effect was the first overwhelming success of Electro-Harmonix due to the distinctive sound, price, and reliability. Ne5532 Op Amp Review This LTSpice simulation of the Muffsy Phono Preamp uses LT1792 and LT1037 that are quite similar to the OPA2134/LM4562 combo. Both the Muffsy and Bugle are really good and I would recommend either. ? If I had succeeded in my venture, that preamp could have been "the first phono stage". The highly regarded Elekit designer, Mr. Now for some noise measurements of the Muffsy Phono Preamp. All of the . The Muffsy I used a PCB. Free Software Sentry – watching and reporting maneuvers of those threatened by software freedom Jag noterar att: AT95 har den anpassats ordentligt m h a 47k och 100p? Eller borde den ha en annan belastning? Kopplingen är i stort sett invändningsfri för t ex TL072, som har FET-ingång och alltså inte drar nämnvärd ström genom PUn, medan en 5532 behöver en hel del biasström, vilken då i huvudsak kommer via PUn. The hum reduces when the turntable is connected with Muffsy. V2 "73" RAMS HEAD BIG MUFF PI - The second variant of the V2 circuit appeard circa 1973. Trademarks are property of their owners. At first glance this appears to High quality tube phono preamplifier kits for tape and vinyl. Fig. DIY AUDIO / Inspiring for DIY amp / by Manoo Manookulkit. Start the assembly by install­ing the solder pins, jumpers, and then all the resistors (including the trimpot P1). Description Symmetric +/-12 VDC power supply has been designed for audio applications, can power up microphone pre-amplifier, audio buffers, audio mixer, distributions amplifier, headphone amplifier, VU meter and few o other equipment or projects required dual supply. Take the Muffsy for example. com Save $20 when you buy the phono stage, power supply and back panel from this page instead  Contribute to muffsy/RelayInputSelector development by creating an account on This project, including the schematic and board layout, is open source. Schematic for the Muffsy Phono Preamp PP-4 / PP-3 Rev A (single channel) LTSpice Simulation: Muffsy Phono Preamp PP-4 / PP-3 Rev A This LTSpice simulation of the Muffsy Phono Preamp uses LT1792 and LT1037 that are quite similar to the OPA2134/LM4562 combo. com This is the back panel kit as you get it, photo courtesy of Muffsy. Read More Jul 25, 2017 · lol. For once, there is no magic involved in a true audiophile piece of equipment. written by Here is the schematic for the Muffsy Phono Preamp PP-3. Well we have now moved very far from ordering a $5 supply from China and sourcing some ancillaries to having a pcb made (at a cost which is still unknown but it won't be as low as $5) buying all components and sourcing all ancillaries. Read more This project is a solution to power up most of devices or projects requiring dual (+/-12V) power supply. This ranges from amplifier using transistor . io/project/6167-muffsy-phono-preamp-pp-3. Schematic for the Muffsy Phono Preamp PP-3. Minimalist audiophile circuit using the legendary 2sk170 JFET Passive (no feedback) RIAA equalization ~40dB gain Russian K40Y and K42Y paper in oil coupling capacitors Nichicon Muse filter capacitors Vishay/Dale CMF60 resistors Audiophile quality American made PCB Requires external 12-24VDC Velleman was founded by Koen Velleman in 1974 to produce electronic kits. Certainly the 'Muffsy' is a well regarded and popular kit phono stage. _____ https://oshpark. Kit includes circuit board and all components. Regardless of that the design is very simple and open to a lot of tweaking. All kits are made in the USA. _____ I used the PDF’s from Skrodahl’s Muffsy CNC board a couple of weeks ago and thought it was close to 84mm x 68mm. geo@yahoo. com First off, it’s not just the preamp, but the power supply kit and a complete back panel kit for a specific enclosure if you desire to purchase one The schematic (shown below) and included in the detailed kit assembly manual. It would have had the additional. muffsy schematic