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Colorsound Inductorless Wah (Vsex FX mods)
Based on the Colorsound Wah· 4 other boards clone it
- Category
- Wah / Envelope
- Price
- see vendor
From the vendor
The old inductorless Colorsound wah, a single transistor with a twin-T style feedback network, which Zvex uses with mods in his Ooh-Wah, Seek-Wah and Wah-Probe. Here the wah pot is replaced by the LDR of the proximity controller's vactrol to make a Wah Probe work-alike.
Replace the 33K resistor with a 50KB pot for a 'resonance' control, from standard wah to squealing self-oscillation. The original unit uses a TN326 transistor; many NPN transistors work, and the author used a 2N3904.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 20 rows
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| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 10 | ||||
| R1 | 1M | 1M | input pull-down; read from the schematic by eye | |
| R2 | 330K | 330k | input; read from the schematic by eye | |
| R3 | 2.7M | 2.7M | collector to base; read from the schematic by eye | |
| R4 | 10K | 10k | collector; read from the schematic by eye | |
| R5 | 470 | 470 | supply; read from the schematic by eye | |
| R6 | 100K | 100k | output; read from the schematic by eye | |
| R7 | 470K | 470k | output; read from the schematic by eye | |
| R8 | 180K | 180k | read from the schematic by eye | |
| R9 | 180K | 180k | read from the schematic by eye | |
| R10 | 33K | 33k | or a 50KB resonance pot; read from the schematic by eye | |
| Capacitors 8 | ||||
| C1 | 100n | 100n | input; read from the schematic by eye | |
| C2 | 10u | 10u | electrolytic, supply filter; read from the schematic by eye | |
| C3 | 100n | 100n | output; read from the schematic by eye | |
| C4 | 2.2n | 2.2n | across R6; read from the schematic by eye | |
| C5 | 100n | 100n | feedback; read from the schematic by eye | |
| C6 | 15n | 15n | read from the schematic by eye | |
| C7 | 22n | 22n | read from the schematic by eye | |
| C8 | 15n | 15n | read from the schematic by eye | |
| Transistors 1 | ||||
| Q1 | TN326 | TN326 | or 2N3904; read from the schematic by eye | |
| Other 1 | ||||
| LDR1 | LDR | LDR | from the Probe controller's vactrol; read from the schematic by eye | |
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