Zap Frequency is a clone of the Systech Harmonic Energizer. This effect is a parametric EQ with variable band width, frequency, and resonance. The effect is very strong! It would make a good wah if you control the frequency with a foot treadle. It can be for a “cocked wah” and boost. It’s also good for post processing other instruments to add sub bass or create extreme filter effects.
| Part Number | Value |
| C1 | 2n2 |
| C2 | 1µ |
| C3 | 47n |
| C4 | 10µ |
| C5 | 10µ |
| C6 | 1µ |
| C7 | 47n |
| C8 | 10µ |
| C9 | 10µ |
| C10 | 100µ |
| C11 | 100n |
| C12 | 10µ |
| D1 | 1n5817 |
| D2 | LED any |
| D3 | 1n914 (or any, or a wire see notes) |
| D4 | 1n914 (or any, or a wire see notes) |
| D5 | 1n914 (or any, or a wire see notes) |
| D6 | 1n914 (or any, or a wire see notes) |
| FREQ | A50k |
| GAIN | A50k 16MM |
| VOLUME | A100k 16MM |
| BAND | B5k |
| IC1 | TL074 |
| Q1 | J201 |
| R1 | 4M7 |
| R2 | 10k/22k |
| R3 | 22k |
| R4 | 1k |
| R5 | 27k |
| R6 | 5k1 |
| R7 | 1k |
| R8 | 1k |
| R9 | 10k |
| R10 | 20k |
| R11 | 560r |
| R12 | 100k |
| R13 | 2k2 |
| R14 | 10k |
| R15 | 10k |
| R16 | 1k |
| R17 | 1M |
D3, D4, D5, and D6 clip the output signal. This can add a nice overdrive. The original didn’t have these and created some harsh op-amp clipping. Without these diodes you will need to adjust gain to avoid harsh op-amp clipping.
You can replace these diodes with wires, use two in series, or one in series with a wire for the other, or use two in series and one in series to emphasize even order harmonics, it’s up to you!
Use any diodes you like! Silicon 1N914, 1N4148, or other types, even LEDs might work well here!
Here is the drilling guide. You’ll need to print this at 100%! http://www.super-freq.com/wp-content/uploads/2024/06/Zap-Drill-Guide.pdf
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