This project provides tested plans for a 4HP Eurorack-format synthesizer module, containing two banks of 1 -> 3 active buffers, taking any signal at the input and precisely replicating it on the three outputs.
| Qty | Value | Device | Package | Parts |
|---|---|---|---|---|
| 3 | TL072 | Dual op amp | TSSOP8 | ICxx |
| 6 | ~100nF | Capacitor | 0603 | DC1 – DC6 |
| 1 | 5x2 | 2.54mm Pin | Power | |
| 8 | Inline mono jack | Thonkconn | A, A1, A2, A3, B, B1, B2, B3 |
- Solder the power connector before soldering signal jacks. There is very little space between the jacks to reach the top of the board after they are attached.
- Input A (labeled on PCB) drives output A1, A2, A3; Input B drives output B1, B2, B3. Input A is normalled to Input B; if this behavior isn't desired, cut jumper trace labeled A->B.