Elektronika 12-011 (USSR analog multieffect) [gut shots]  [schematic]

All about modern commercial stompbox circuits from Electro Harmonix over MXR, Boss and Ibanez into the nineties.
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scream314
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Post by scream314 »

I own an old USSR made Elektronika 12-011 full analog multieffect and want to rebuild/repair it. As I'm a quite bad tracer, I need help with tracing. I'll do the rest (offboard wiring), and put the complete schematic togedher.

The multi contains 4 effects (wah, phaser, compressor, vibrato) with separarte boards. There are a few smart ideas (footswitches made from toggle switches, expression pedal), and the ciruits may be interesting, too. The wah seems to be inductorless, the phaser has 6 stages. There are a few mysterious components (they are unknown, at least for me), I need help to identify them.

The ICs are к553уд2 (http://chip-info.narod.ru/datasheets/mi ... 53ud2.html) and К1400УH1 (http://radioparts.ru/chips/k1400un1.html; in compressor, may be an OTA). The n-FETs are 4 legged (D, S, G, case) metal case KP303's (http://emil.matei.ro/doc/kp303.png).

The compressor:
comp1.JPG
comp-back.JPG
The phaser:
phase1.JPG
phase2.JPG
phase-back1.JPG
phase-back2.JPG
The vibrato:
vibe1.JPG
vibe-back.JPG
The wah:
wah1.JPG
wah2.JPG
wah3.JPG
Unknown green things:
DSCF0442.JPG
DSCF0446.JPG
Footswitch:
DSCF0448.JPG
Wah pedal:
DSCF0449.JPG
Inside:
DSCF0440.JPG
Opamps:
DSCF0441.JPG
DSCF0447.JPG

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kymar
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Post by kymar »

green things is ceramic caps

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Hides-His-Eyes
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Post by Hides-His-Eyes »

What a beautiful piece of work. I can't imagine what something like that would have cost at the time.
Testing, testing, won too fwee

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kymar
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Post by kymar »

maybe it will help
Layout.jpg
schematic.jpg
К553УД2=LM301

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scream314
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Post by scream314 »

kymar wrote:maybe it will help
Definitely. Thanks.

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