Enclosure not stated · 2 knobs
SP-1 Spectrum
Based on the Boss SP-1 Spectrum· 4 other boards clone it
From the vendor
The BOSS SP-1 Spectrum was an effect that boosted a select band of frequencies, so that instruments with a tendency to be “muddy” - such as electric bass - could be brought out in the mix. But the SP-1 also proved to be very popular among keyboard players, who paired it up with electric pianos such as the Fender Rhodes.
Schematic
The schematic image is on the project page. Open it at PCBWay.
Parts list 24 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- 1k with wiper bar read as a trimmer (no label)
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 11 | ||||
| ×1 | 2M | 2M | read from the schematic by eye | |
| ×1 | 470k | 470k | read from the schematic by eye | |
| ×1 | 100k | 100k | read from the schematic by eye | |
| ×2 | 33k | 33k | read from the schematic by eye | |
| ×1 | 22k | 22k | read from the schematic by eye | |
| ×1 | 18k | 18k | read from the schematic by eye | |
| ×7 | 10k | 10k | read from the schematic by eye | |
| ×1 | 4k7 | 4.7k | LED resistor; read from the schematic by eye | |
| ×2 | 1k | 1k | read from the schematic by eye | |
| ×1 | 470 | 470 | read from the schematic by eye | |
| ×1 | 47 | 47 | supply series resistor; read from the schematic by eye | |
| Capacitors 8 | ||||
| ×1 | 100u | 100u | electrolytic, supply filter; read from the schematic by eye | |
| ×1 | 47u | 47u | electrolytic, VB filter; read from the schematic by eye | |
| ×3 | 4u7 | 4.7u | electrolytic; read from the schematic by eye | |
| ×2 | 1u | 1u | electrolytic; read from the schematic by eye | |
| ×1 | 100n | 100n | read from the schematic by eye | |
| ×1 | 47n | 47n | read from the schematic by eye | |
| ×2 | 3n3 | 3.3n | read from the schematic by eye | |
| ×1 | 47p | 47p | read from the schematic by eye | |
| Diodes 1 | ||||
| ×1 | 1N4001 | 1N4001 | read from the schematic by eye | |
| ICs 1 | ||||
| ×1 | RC3403A | RC3403A | quad op-amp, four sections drawn; read from the schematic by eye | |
| Potentiometers 2 | ||||
| Balance | C10k/A10k | C10K/A10K | Potentiometer | dual-gang: C10k section (pins 1-3) and A10k section (pins 4-6); read from the schematic by eye |
| Spectrum | B100k | B100k | Potentiometer, dual | dual-gang B100k (pins 1-3 and 4-6); read from the schematic by eye |
| Trimmers 1 | ||||
| ×1 | 1k | 1k | drawn as a resistor with a wiper bar feeding pin 9 of the bandpass stage; read from the schematic by eye | |
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