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STD Attenuverter - Walter G. Jung #5.12 pg 237
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License: CC-BY-SA 3.0
Description
This is a eurorack 4 channel attenuvertor with unity buffer or 3x or 10x gain pre-amp.
The board is 100mm high, 33 mm deep with the power header protruding a bit further. It should be 2HP wide.
This is totally untested, based purely on the circuit in Walter Jung's "IC Op Amp CookBook".
Will be testing soon, before getting the board made up.
Design Drawing
schematic diagram
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PCB
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | 10K | RD6,RC6,RB6,RA6 | RES-ADJ-TH_RK097111080J | 4 |
| 2 | MB6S(46MIL) | D1 | DIO-BG-SMD_MINIDIP | 1 |
| 3 | TJ-L3FYTGHKMCGSFLC7K-A5 | LED2,LED1 | LED-TH_BD3.8-P2.54-FD | 2 |
| 4 | 20K | RB5,RB4,RA4,RC5,RA5,RD4,RD5 | R_AXIAL-0.3 | 7 |
| 5 | 4.7K | RA3,RC3,RD3,RB3 | R_AXIAL-0.3 | 4 |
| 6 | 10k | RC2,RA2,RB2,RD2 | R_AXIAL-0.3 | 4 |
| 7 | 1k | RC1,RA1,RD1,RB1 | R_AXIAL-0.3 | 4 |
| 8 | RC4 | RC4 | R_AXIAL-0.3 | 1 |
| 9 | 560 | R2,R1 | R_AXIAL-0.3 | 2 |
| 10 | 22uF | C2,C1 | CAP-TH_BD4.0-P1.50-D0.8-FD | 2 |
| 11 | 200MSP1T2B2M6RE | SW-C,SW-D,SW-B,SW-A | SW-TH_3P-P2.54_L9.1-W8.1 | 4 |
| 12 | 100n | CA1,CC1,CC2,CA2 | RAD-0.1 | 4 |
| 13 | IDC Box 2X8 2.54MM | P1 | CONN-TH_16P-P2.54_C9142 | 1 |
| 14 | PJ313D 3.5mm jack compact | JA-OUT,JB-IN,JA-IN,JC-IN,JC-OUT,JD-IN,JD-OUT,JB-OUT | AUDIO-TH_PJ313D -TL-COPY | 8 |
| 15 | TL074MJ | U1,U2 | DIP14 | 2 |
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