Enclosure not stated · 3 knobs
Electro Harmonix Clone Theory SAD1024
Based on the Electro-Harmonix Clone Theory SAD1024
- Category
- Vibrato / Chorus· Chorus
- Price
- see vendor
- Tags
- Chorus
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 53 rows
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Check before you build · 4 values the reader of this schematic was not sure of
- 58K: could be 56K
- 51K: could be 56K
- 330K: drawn like 380K
- 0.033uF: could be 0.022uF
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 24 | ||||
| ×1 | 1M | 1M | input pulldown; read from the schematic by eye | |
| ×1 | 82K | 82k | input op amp input resistor; read from the schematic by eye | |
| ×1 | 160K | 160k | input op amp feedback; read from the schematic by eye | |
| ×1 | 470K | 470k | bias divider from +15V; read from the schematic by eye | |
| ×1 | 240K | 240k | bias divider to ground; read from the schematic by eye | |
| ×1 | 10K | 10k | input op amp output to ground (blend leg); read from the schematic by eye | |
| ×2 | 100K | 100k | SAD1024 input biasing (sections 1 and 2); read from the schematic by eye | |
| ×1 | 2.2K | 2.2k | feed to Bias trimmer; read from the schematic by eye | |
| ×1 | 10Ω | 10 | supply to SAD1024 pins 7/9; read from the schematic by eye | |
| ×1 | 4.7K | 4.7k | Balance trimmer to ground; read from the schematic by eye | |
| ×2 | 75K | 75k | mixer: one from Blend wiper, one from SAD output; read from the schematic by eye | |
| ×1 | 36K | 36k | output filter op amp input; read from the schematic by eye | |
| ×2 | 240K | 240k | output op amp feedback divider; read from the schematic by eye | |
| ×2 | 1.1K | 1.1k | output series resistor; Edge network; read from the schematic by eye | |
| ×1 | 47K | 47k | output pulldown; read from the schematic by eye | |
| ×2 | 10K | 10k | LFO bias divider; read from the schematic by eye | |
| ×2 | 510K | 510k | LFO feedback / Rate network; read from the schematic by eye | |
| ×1 | 58K | 58k | LFO integrator to comparator; could be 56K; read from the schematic by eye | |
| ×1 | 51K | 51k | LFO output to Depth pot; could be 56K; read from the schematic by eye | |
| ×1 | 120K | 120k | LFO comparator hysteresis; read from the schematic by eye | |
| ×1 | 22K | 22k | CD4047 timing; read from the schematic by eye | |
| ×1 | 330K | 330k | 2N4302 drain-gate; could be 380K; read from the schematic by eye | |
| ×1 | 62K | 62k | Depth wiper to JFET gate; read from the schematic by eye | |
| ×1 | 12Ω | 12 | power supply, after 78L15; read from the schematic by eye | |
| Capacitors 14 | ||||
| ×1 | 30pF | 30p | input op amp feedback; read from the schematic by eye | |
| ×1 | 0.15uF | 150n | input coupling; read from the schematic by eye | |
| ×1 | 0.1uF | 100n | bias decoupling (drawn 0.1); read from the schematic by eye | |
| ×1 | 0.1uF | 100n | SAD1024 input coupling (drawn 0.1µ); read from the schematic by eye | |
| ×1 | 0.027uF | 27n | across 10K at input op amp output; read from the schematic by eye | |
| ×1 | 5uF | 5u | electrolytic, Blend pot to ground; read from the schematic by eye | |
| ×2 | 1uF | 1u | electrolytic: between SAD sections; SAD output to mixer; read from the schematic by eye | |
| ×3 | 680pF | 680p | output filter (feedback and to ground); CD4047 timing; read from the schematic by eye | |
| ×1 | 0.033uF | 33n | output filter to ground; could be 0.022; read from the schematic by eye | |
| ×1 | 15uF | 15u | electrolytic output coupling; read from the schematic by eye | |
| ×1 | 0.1uF | 100n | Edge switch cap (drawn 0.1µ); read from the schematic by eye | |
| ×1 | 0.22uF | 220n | LFO integrator; read from the schematic by eye | |
| ×1 | 220uF | 220u | power supply filter; read from the schematic by eye | |
| ×1 | 500uF | 500u | power supply filter after regulator; read from the schematic by eye | |
| Diodes 2 | ||||
| ×1 | 1N4148 | 1N4148 | or 1N914, supply to SAD1024; read from the schematic by eye | |
| ×2 | 1N4001 | 1N4001 | power supply rectifiers; read from the schematic by eye | |
| Transistors 1 | ||||
| ×1 | 2N4302 | 2N4302 | N-channel JFET, clock frequency control; read from the schematic by eye | |
| ICs 4 | ||||
| ×2 | 4558 | 4558 | dual op amp: one for input buffer/output filter, one for LFO; read from the schematic by eye | |
| ×1 | SAD1024A | SAD1024A | dual bucket brigade (sections 1 and 2); read from the schematic by eye | |
| ×1 | CD4047AE | CD4047AE | clock oscillator, ~43kHz; read from the schematic by eye | |
| ×1 | 78L15 | 78L15 | +15V regulator; read from the schematic by eye | |
| Potentiometers 3 | ||||
| Blend | 10K | 10k | Potentiometer | chorus/vibrato blend; read from the schematic by eye |
| Rate | 1M | 1M | Potentiometer | read from the schematic by eye |
| Depth | 100K | 100k | Potentiometer | read from the schematic by eye |
| Trimmers 3 | ||||
| Bias | 10K | 10k | read from the schematic by eye | |
| Gain Trim | 5K | 5k | read from the schematic by eye | |
| Balance | 1K | 1k | read from the schematic by eye | |
| Switches 2 | ||||
| Edge | SPST | SPST | switches 0.1uF + 1.1K to ground; read from the schematic by eye | |
| ×1 | SPST | SPST | mains power switch; read from the schematic by eye | |