125B · 6 knobs
From the vendor
Optical compressor/limiter. Clone PCB of the Cicognani SexyComp 76, but in a smaller format. Excellent five knobber. Smooth compressor, with input and out controls. Threshold indicator allows for adjusting the input signal just so. The Comp. control takes you all the way from full on limiting (CW) to nice breathy compression (CCW). The added tone control is handy too, for tone tweaking. More than capable of squeezing the best out of your signal. Che bello!
Schematic
The schematic is in the vendor's build document, page 4. Open the build document. No KiCad fragment has been drawn for this circuit yet.
Parts list 49 rows
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ocr read from an image · sch paired from the schematic · fixed corrected by hand. Check marked values against the build document.
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 19 | ||||
| R3 | 10rsch | 10 | ||
| R4 | 1msch | 1M | ||
| R5 | 1ksch | 1k | ||
| R6 | 1msch | 1M | ||
| R7 | 68ksch | 68k | ||
| R8 | 68ksch | 68k | ||
| R9 | 100ksch | 100k | ||
| R10 | 47rsch | 47 | ||
| R11 | 1ksch | 1k | ||
| R12 | 1ksch | 1k | ||
| R13 | 220ksch | 220k | ||
| R14 | 22ksch | 22k | ||
| R15 | 1m2sch | 1.2M | ||
| R16 | 68ksch | 68k | ||
| R17 | 220rsch | 220 | ||
| R18 | 1ksch | 1k | ||
| R19 | 1msch | 1M | ||
| R20 | 100rsch | 100 | ||
| R21 | 100ksch | 100k | ||
| Capacitors 19 | ||||
| C1 | 100nsch | 100n | ||
| C2 | 470usch | 470u | ||
| C3 | 100usch | 100u | ||
| C4 | 100usch | 100u | ||
| C5 | 100usch | 100u | ||
| C6 | 100usch | 100u | ||
| C7 | 100nsch | 100n | ||
| C8 | 2u2sch | 2.2u | ||
| C9 | 470nsch | 470n | ||
| C10 | 22psch | 22p | ||
| C11 | 47nsch | 47n | ||
| C12 | 4u7sch | 4.7u | ||
| C13 | 100nsch | 100n | ||
| C14 | 22psch | 22p | ||
| C15 | 220psch | 220p | ||
| C16 | 2u2sch | 2.2u | ||
| C17 | 22nsch | 22n | ||
| C18 | 470nsch | 470n | ||
| C19 | 22usch | 22u | ||
| Diodes 1 | ||||
| D2 | 1n4001sch | 1N4001 | ||
| Transistors 1 | ||||
| Q1 | BC639ocr | BC639 | ||
| ICs 2 | ||||
| IC1 | lt1054sch | LT1054 | ||
| IC2 | LF347Nocr | LF347N | ||
| Potentiometers 6 | ||||
| Comp | B5Ksch | B5k | Potentiometer | |
| Input | A100Ksch | A100k | Potentiometer | |
| Output | A100Ksch | A100k | Potentiometer | |
| Ratio | A200Ksch | A200k | Potentiometer | |
| Tone | B10Ksch | B10k | Potentiometer | |
| BUT | A250Kocr | A250k | Potentiometer | |
| Switches 1 | ||||
| Bypass | 3PDTocr | 3PDT | ||