Stackable opamp mini board

4 months ago 136
  • Description
  • Documents
  • BOM
  • Attachments
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Description

A breadboard-compatible dual non-inverter audio amp built around an opamp.

Exposes most of its internals on pins for more versatility (variable gain, simple filter, ...). Some parts are optional.

Can be stacked to create a mixer with 1 board per stereo channel and 1 board for a master volume.

Documents

Preamp schematic

Stackable audio preamp PCB

BOM

ID Name Designator Footprint Quantity
1 1N5817 D1 DO-35 1
2 470u CD1 CAP-D6.3XF2.5 1
3 Header-Male-2.54_1x6 P1 HDR-6X1/2.54 1
4 10k pot - optional RV1,RV2 HDR-TH_3P-P2.54-V 2
5 100u CD2,CD3 1206 2
6 Header-Male-2.54_1x1 PS1,PS2,PGND1,PVCC1,PVCC2,PGND2,PSS1,PSS2 HDR-1X1/2.54 8
7 220S-1*4P H=8.5MM Ytype Gold-plated HOA1,HOA2 DIP-1X4P2.54 2
8 100n CI1,CI2,C-1,C-2 0805 4
9 10u CO1,CO2 0805 2
10 1u CD4 0805 1
11 3.3M RI+1,RI-1,RI+2,RI-2 0805 4
12 100k RO1,RF1,RF2,RM1,RM2,RO2 0805 6
13 1k R-1,R-2 0805 2
14 0 RR1,RR2 0805 2
15 10k RL1,RL2 0805 2
16 OPAMP U1 SOIC-8_150MIL 1

Attachments

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