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Old 19th March 2008, 12:52 PM   #1
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Default My DIY stompbox

Hello everyone! Recently I have finished work on a very cool distortion pedal and now I'm glad to introduce it.

The scheme is attached below. It is taken from here:
http://forum.gtlab.net/cgi-bin/yabb2...=1180818602/90

The stompbox is built on russian JFETs KP303A or 2P303A, which could be replaced with J201. I think that russian transistors are very good because of their low noise, metal body protecting them from outer electircal interference, and extra durability. Try to get them, guys. And no goddamn fitting by U and Id parameters!

All capacitors except C9 and C10 are film caps.

Nothing difficult I think. Few words about the sound: it is powerful and grinding. It is True and Evil hi-gain overdrive! In my opinion it sounds better than most of overdrive/distortion pedals you may find at musical store.

Photos and sound samples will come soon, I guess not later than next week.
Attached Images
File Type: gif bsiab_x.gif (33.9 KB, 460 views)
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Old 20th March 2008, 10:46 AM   #2
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Hi, is your overdrive based on the Brown Sound In A Box I pedal ?
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Old 21st March 2008, 07:40 AM   #3
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Hello, Andronico. I guess it is a kind of modification of the device you've mentioned. Here's the story of mods (in russian unfortunately):
http://gtlab.net/gtlab2/readarticle.php?article_id=33

I can't say more, sorry. I just took scheme, necessary parts and combined them in a small box.
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Old 21st March 2008, 11:59 AM   #4
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Thank you Dr, I visit your page (using google to translate from russian to english) and understood some of the modifications.
I made a BSIAB II two years ago and love how it sounds. How is yours compared with BSIAB II ? Is the same type of sound ?
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Old 21st March 2008, 02:06 PM   #5
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Actually, I'm not the author of all those mods, heh!

The answer is "Yes!", it sounds similar to BSIAB 2, but more angry or something like that. Anyway the difference is not too big. May be there is a rational point in comparing the sound by samples? I mean that this Sunday I'm gonna record how it sounds and place it here. I'll use microphone, tube amplifier etc. Don't you want to join the experiment?

P.S.: Main advantage of the scheme I attached above is that you don't have to fit transistors by cut-off voltage and drain current. I don't think it influenced the sound much.
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Old 9th December 2010, 01:32 PM   #6
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Anybody know where I could buy KP303A or 2P303A to ship to the United States?
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Old 17th December 2010, 02:59 PM   #7
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DrZoidburg What is the value of C6? Surley it cant be 2200 Ufd ! Also what fets are used?
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Old 17th December 2010, 08:17 PM   #8
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Quote:
Originally Posted by firechief View Post
DrZoidburg What is the value of C6? Surley it cant be 2200 Ufd ! Also what fets are used?
It's clearly marked as 2200(pF) - the FET's are labelled as well, some strange Russian numbers presumably try substituting some you can get.
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