Enclosure not stated · 4 knobs
Boss CS-3 (JPG)
Based on the Boss CS-3 (JPG)
- Category
- Compressor· Compressors Gates and Limiters
- Price
- see vendor
- Tags
- Compressors Gates and Limiters
Schematic
The schematic is the archived file. Open it at Experimentalists Anonymous, or browse its folder.
Parts list 48 rows
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Check before you build · 1 value the reader of this schematic was not sure of
- 39k: written over, could be 30k
| Ref | Value | Normalized | Type | Notes |
|---|---|---|---|---|
| Resistors 16 | ||||
| ×9 | 1M | 1M | IC1a bias, two at Q5, flip-flop cross links (2), footswitch pull-up, Q1 bias, Q8 and Q6 emitter; read from the schematic by eye | |
| ×8 | 10k | 10k | input, IC1b divider (2), Q1 emitter, Level-to-IC2b, IC2b feedback, IC2a output, Q7 source; read from the schematic by eye | |
| ×5 | 100k | 100k | flip-flop (2), output pulldown, IC4a feedback, IC4a input; read from the schematic by eye | |
| ×4 | 56k | 56k | flip-flop collector loads and base resistors; read from the schematic by eye | |
| ×2 | 1k | 1k | IC1b output to IC3; output series; read from the schematic by eye | |
| ×2 | 47k | 47k | Q8 and Q6 base drive; read from the schematic by eye | |
| ×2 | 22k | 22k | Attack series; Sustain divider bottom; read from the schematic by eye | |
| ×2 | 4k7 | 4.7k | Tone network; Sustain divider top; read from the schematic by eye | |
| ×1 | 3k3 | 3.3k | status LED; read from the schematic by eye | |
| ×1 | 100Ω | 100 | footswitch; read from the schematic by eye | |
| ×1 | 220Ω | 220 | power supply; read from the schematic by eye | |
| ×1 | 33k | 33k | IC3 pin 1; read from the schematic by eye | |
| ×1 | 39k | 39k | IC2a feedback; written over, could be 30k; read from the schematic by eye | |
| ×1 | 47Ω | 47 | IC3 pins 2-4; read from the schematic by eye | |
| ×1 | 2k7 | 2.7k | IC3 pin 5; read from the schematic by eye | |
| ×1 | 15k | 15k | read from the schematic by eye | |
| Capacitors 11 | ||||
| ×1 | 22n | 22n | input; read from the schematic by eye | |
| ×4 | 1uF | 1u | Q5 input, IC3 coupling, output, IC4 input; read from the schematic by eye | |
| ×4 | 47n | 47n | Q5 gate network, Q4 gate network, Q1 input, Level output to IC2b; read from the schematic by eye | |
| ×1 | 22n | 22n | Tone network (written like 27n); read from the schematic by eye | |
| ×2 | 470p | 470p | flip-flop; read from the schematic by eye | |
| ×2 | 220p | 220p | flip-flop; read from the schematic by eye | |
| ×3 | 10n | 10n | footswitch debounce; Q8 and Q6 inputs; read from the schematic by eye | |
| ×1 | 47uF | 47u | IC1b bias filter; read from the schematic by eye | |
| ×1 | 560p | 560p | IC2a feedback; read from the schematic by eye | |
| ×1 | 4.7uF | 4.7u | Q7 gate (attack/release); read from the schematic by eye | |
| ×1 | 100uF | 100u | supply filter; read from the schematic by eye | |
| Diodes 4 | ||||
| ×6 | Diode | DIODE | no part number given: two IC1a feedback clippers, Q5 and Q4 gate diodes, Q8 and Q6 rectifiers; read from the schematic by eye | |
| ×1 | 5.6V | 5V6 | zener in series with the status LED; read from the schematic by eye | |
| ×1 | Diode | DIODE | no part number given; in series with the 220Ω in the power supply; read from the schematic by eye | |
| ×1 | 1N4001 | 1N4001 | polarity protection; read from the schematic by eye | |
| Transistors 8 | ||||
| Q1 | 2SC732 | 2SC732 | read from the schematic by eye | |
| Q2 | 2SC945 | 2SC945 | read from the schematic by eye | |
| Q3 | 2SC945 | 2SC945 | read from the schematic by eye | |
| Q4 | 2SK30A | 2SK30A | JFET switch; read from the schematic by eye | |
| Q5 | 2SK30A | 2SK30A | JFET switch; read from the schematic by eye | |
| Q6 | 2SC945 | 2SC945 | read from the schematic by eye | |
| Q7 | 2SK117 | 2SK117 | JFET; read from the schematic by eye | |
| Q8 | 2SC945 | 2SC945 | read from the schematic by eye | |
| ICs 4 | ||||
| IC1 | M5218AL | M5218AL | dual op amp; read from the schematic by eye | |
| IC2 | M5218AL | M5218AL | dual op amp; read from the schematic by eye | |
| IC3 | THAT 2159 | THAT 2159 | VCA; read from the schematic by eye | |
| IC4 | BA718 | BA718 | dual op amp; read from the schematic by eye | |
| Potentiometers 4 | ||||
| Level | 50k | 50k | Potentiometer | read from the schematic by eye |
| Tone | A20k | A20k | Potentiometer | 20k log; read from the schematic by eye |
| Attack | 250k | 250k | Potentiometer | read from the schematic by eye |
| Sustain | A20k | A20k | Potentiometer | 20k log; read from the schematic by eye |
| LEDs 1 | ||||
| ×1 | LED | LED | status LED; read from the schematic by eye | |