Assembly Guide
Populate the PCB
Place and solder
- sockets for U1-U3
- R2, R17, R18
- ceramic capacitors
- diodes D1, D3, D4
- BJT Q1
- film capacitor C3 and remaining electrolytic capacitors
- mono jacks
- potentiometers
- IDC header (back side)
Install the LED (D2) once the panel is fitted to ensure alignment.
Test and Calibration
No calibration required. To test, the internal oscillator or an external gate can be used to trigger samples. Apply a known waveform (e.g. triangle) at the input and observe the sampled waveform at the unfiltered output.
BOM
| Reference | Value | Qty |
|---|---|---|
| C1 | 1u | 1 |
| C2,C3 | 1n | 2 |
| C4,C7,C8,C17 | 10u | 4 |
| C5 | 22u | 1 |
| C6 | 22p | 1 |
| C9,C10,C11,C12,C13,C14,C15 | 100n | 7 |
| C16 | 10n | 1 |
| D1 | 1N4148 | 1 |
| D2 | 3mm LED | 1 |
| D3,D4 | 1N5819 | 2 |
| J1, J2, J3, J4, J5, J6 | WQP-PJ301M-12 | 6 |
| J7 | IDC 10P Header Vertical | 1 |
| Q1 | BC547 | 1 |
| R1,R8,R9,R10,R15,R16 | 1k | 6 |
| R2,R7 | 4k7 | 2 |
| R3 | 10k | 1 |
| R4 | 15k | 1 |
| R5,R11,R12,R14 | 100k | 4 |
| R6 | 6k8 | 1 |
| R13 | 47k | 1 |
| R17,R18 | 10 | 2 |
| RV1 | B1M0 PTV09 | 1 |
| RV2 | A100k PTV112-4 (dual gang) | 1 |
| RV3 | B100k PTV09 | 1 |
| SW1 | 2MS1T1B1M1 SPDT | 1 |
| U1 | 40106 | 1 |
| U2 | LF398 | 1 |
| U3 | TL072 | 1 |