Looking for pointers on first DIY preamp please.
Hello folks, First of all, please excuse my lack of technical terminology when it comes to sound systems. I have been working with small amps for neck-loop inductance systems and am willing to move on...
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FS: Sennheiser HD 500 w/ 10'MHE-310 Headphone Adaptor Cable, 3.5 mm TRS to...
Basically new, I bought these for checking my work on various headphone pres/amp builds. They are in pristine condition. They come with 10' adapter cord for 3.5mm to 1/4". $100 shipped via USPS...
View ArticleTDA7293 x3 parallel mono_power supply
Hello Diyers! I ordered few days ago an amp board with 3 TDA7293 YJ 255W TDA7293 X 3pcs Mono Amplifier board Picture - More Detailed Picture about YJ 255W TDA7293 X 3pcs Mono Amplifier board new...
View ArticleWTB: Onkyo SR-TX1000 or Integra DTC-10.5 Parts
Anyone have any "Cards" laying around for these monster receivers? Specifically looking for a Optical/Coax card, as it has the DSP board on it. Let me know. Thanks
View ArticleMotorola three channel
Hi all. I am a total newbie, and I have a ton of questions. I just bought an old Motorola SE amp that was taken out of a console. It is three channel. The guy I bought it from said the third channel is...
View ArticleTAS 5630 distortion
I keep reading that @ 300 watts its distortion is 10%. Has anyone pushed it that far and measured it ? How can it be reduced - like say having a bigger power supply help ? Running it at a lower voltage...
View ArticleWhy 4 Ohm Speakers?
Hi, I have been auditioning a cheap, but very nice sounding Chinese made chip amp board with a variety of different speakers. With a pair of 15 inch 15 Ohm vintage "Monkey Coffins" I get get some...
View ArticleSpeakers in alcoves around the chimney?
I'm intending to make some new speakers - they'll mostly be used for music but will be either side of my TV and so will need to turn their hand to dramatic effects in film soundtracks too. Either way,...
View ArticleIn need of SJEP120R100's
Wanting to purchase a pair, matched if possible of sjep120r100 for a f2j clone..... Are these completely extinct ?.... Mike
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Quick primary check pls (diagram)
I called the manufacturer, and got the primary voltages for each wire on this power transformer. Is my diagram correct for typical 120v/60Hz ? (USA) (700VA) !! Choices: A) yes. B) no. C) no, but try...
View ArticleOptions for (very) small transducers for earbuds?
I've been reading up on custom in ear monitors. You can definitely can DIY these, but it requires expensive balanced armatures which, if you can even buy them in low quantities, are significantly more...
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Suggest on my project,PCM1794
Hello,World! So my thesis is done.It's a PCM 1794 DAC with USB.However,I want to use it for listening too.This is my first digital project. I'm using latest XMOS for USB->I2S.The PCM1794 is done...
View ArticleIs there any software out there to pick optimal load lines?
The core of designing a tube amp is simply selecting a load line. Something that is pretty easy on the drawing board when you can pick all your parts values. When selecting a load line my understanding...
View ArticlePassive radiator sub box thickness
Planning to put together a passive radiator box with a TC Sounds LMS Ultra 5400 and two 18" VMP passive radiators. My first thoughts were to make it half a meter thick to stop wall vibration, but...
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How to use TPC/TMC?
Hi everyone, I was using Miller dominant pole compensation and this kind of compensation, seems to produce high values of THD20 on the order of 0.0x %, so I decided to use something like TPC (two pole...
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Design Shorting Tubes?
I am working on a DC coupled output cathode follower unit I found in the backwaters of Tube Cad Journal. The 12BH7s seem to short somewhere resulting in an insane amount of current draw from the B-...
View ArticleUltimate Open Source XMOS USB-I2S: The source to end all sources.
There are a host of options on DIYaudio for I2S, but none of them seem to completely fit the bill, and most importantly, very few are open source! Therefore, I propose a group project to build the...
View ArticleAll I've got is a scope - how do I measure PS stability?
I have the usual assortment of small test tools, but for big stuff all I have is a Tek 2465A. Have 1x and 10x probes. I'm trying to figure out how much I can do to measure PS stability using a scope. I...
View ArticleDesigning for Ultra-Low THD+N in Analog Circuits
By Bruce Hofer, Chairman & Co-Founder, Audio Precision
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SS REF500 Oscillating Perry can you take a look
I have a Soundstream REF500 amplifier that is oscillating. When I got the amplifier it had burnt Zobel resistors, 2 emitter resistors (replaced) and 2 TIP102 (bank replaced). This got the amp to...
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