Elektronika 12-011 (USSR analog multieffect) [gut shots] [schematic]
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: The phaser: The vibrato: The wah: Unknown green things: Footswitch: Wah pedal: Inside: Opamps:
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: The phaser: The vibrato: The wah: Unknown green things: Footswitch: Wah pedal: Inside: Opamps:
- Hides-His-Eyes
- Tube Twister
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