Enclosure not stated · 3 knobs
Joyo Ultimate Drive (Harley Benton Ultimate Drive)
Based on the Joyo Ultimate Drive
- Category
- Overdrive
- Price
- see vendor
- Tags
- freestompboxes.org trace
From the vendor
The Joyo Ultimate Drive, sold as the Harley Benton Ultimate Drive and repainted as the Freakish Blues Alpha Drive, is a budget copy of the Fulltone OCD (itself close to the Voodoo Lab Overdrive). A TL082 non-inverting gain stage with a 1M Drive pot feeds 2N7000 MOSFET and germanium-diode clippers to Vref, then a second gain stage, a passive tone control and a two-position output filter switch.
Schematic
The schematic is in the post. Open it at Revolution Deux. No KiCad fragment has been drawn for this circuit yet.
Parts list 33 rows
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Check before you build · 2 values the reader of this schematic was not sure of
- D1 and D2 in the power section have no part numbers on the drawing; D3 is marked only 'Ge'.
- R5 reads 19K, an unusual value, but is clearly printed.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 12 | ||||
| R1 | 1M | 1M | read from the schematic by eye | |
| R2 | 470K | 470k | read from the schematic by eye | |
| R3 | 2.2K | 2.2k | read from the schematic by eye | |
| R4 | 10K | 10k | read from the schematic by eye | |
| R5 | 19K | 19k | read from the schematic by eye | |
| R6 | 10K | 10k | read from the schematic by eye | |
| R7 | 150K | 150k | read from the schematic by eye | |
| R8 | 39K | 39k | read from the schematic by eye | |
| R9 | 33K | 33k | read from the schematic by eye | |
| R10 | 22K | 22k | read from the schematic by eye | |
| R11 | 10K | 10k | read from the schematic by eye | |
| R12 | 10K | 10k | read from the schematic by eye | |
| Capacitors 11 | ||||
| C1 | 22n | 22n | read from the schematic by eye | |
| C2 | 68n | 68n | read from the schematic by eye | |
| C3 | 220p | 220p | read from the schematic by eye | |
| C4 | 1n | 1n | read from the schematic by eye | |
| C5 | 100n | 100n | read from the schematic by eye | |
| C6 | 220p | 220p | read from the schematic by eye | |
| C7 | 10u | 10u | electrolytic; read from the schematic by eye | |
| C8 | 100n | 100n | read from the schematic by eye | |
| C9 | 100n | 100n | read from the schematic by eye | |
| C10 | 100u | 100u | electrolytic; read from the schematic by eye | |
| C11 | 10u | 10u | electrolytic; read from the schematic by eye | |
| Diodes 3 | ||||
| D1 | ? | ? | series polarity diode, no part number; read from the schematic by eye | |
| D2 | ? | ? | shunt diode, no part number; read from the schematic by eye | |
| D3 | Ge | GE | germanium; read from the schematic by eye | |
| Transistors 2 | ||||
| Q1 | 2N7000 | 2N7000 | MOSFET clipper; read from the schematic by eye | |
| Q2 | 2N7000 | 2N7000 | MOSFET clipper; read from the schematic by eye | |
| ICs 1 | ||||
| IC1 | TL082 | TL082 | read from the schematic by eye | |
| Potentiometers 3 | ||||
| Volume | B500K | B500k | Potentiometer | read from the schematic by eye |
| Tone | A10K | A10k | Potentiometer | read from the schematic by eye |
| Drive | B1M | B1M | Potentiometer | read from the schematic by eye |
| Switches 1 | ||||
| HP/LP switch | SPDT | SPDT | S1; read from the schematic by eye | |