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Rev X2 board is now available on Tindie.


  • Universal OpAmp Board
  • 2 Quad OpAmps (typical 14 pin parts) - for example:
    • MCP6004
    • LM324
    • SMT parts
    • 8 Channels
  • Configurable for typical OpAmp circuits
  • Individual 4-pin headers per channel
  • Terminal block for power
  • Bypass capacitors
  • 49X49mm form factor
  • (4) 4-40 mounting holes

8 Channel OpAmp - Rev X2


Design - Rev X2

First Channel Schematic - Rev X2

  • Rev X2 adds resistor (R6 in first channel example below) to pull up the Op Amp input to VCC
    • This allows a voltage divider to be created on one input
    • The other input can be routed to the output with a small feedback resistor
    • Used to create a voltage reference

First Channel Schematic - Rev X2

OpAMP-sch- Ch1 X2.PNG

Mapping of Resistors to OpAmp Channels - Rev X2

OpAmp Ax-/Ix- Ax+/Ix+ Ax-/Qx Ax-/Gnd Ax+/Gnd Ax+/Vaa
U1A R1 R2 R3 R4 R5 R6
U1B R8 R7 R9 R12 R11 R10
U2A R13 R14 R15 R16 R17 R18
U2B R19 R20 R21 R24 R23 R22
U1D R28 R29 R30 R25 R26 R27
U1C R34 R35 R36 R33 R32 R31
U2D R40 R41 R42 R37 R38 R39
U2C R46 R47 R48 R45 R44 R43

8 Channel OpAmp Design - Rev X1


First Channel Schematic - Rev X1


Mapping of Resistors to OpAmp Channels - Rev X1

OpAmp Ax-/Ix- Ax+/Ix+ Ax-/Qx Ax-/Gnd Ax+/Gnd
U1A R1 R2 R3 R4 R5
U1B R6 R7 R8 R10 R9
U2A R11 R12 R13 R14 R15
U2B R16 R17 R18 R20 R19
U1D R23 R24 R25 R21 R22
U1C R28 R29 R30 R27 R26
U2D R33 R34 R35 R31 R32
U2C R38 R39 R40 R37 R36


H1-H8 OpAmps

  1. Ix+
  2. Ix-
  3. Out
  4. Gnd

TB1 Power

  1. GND
  2. +Vcc

Configurations - Rev X1

Inverting Amplifier

Ap31-OpAmp-InvAmp.PNG OpAMP-sch - InvAmp.PNG

Non-inverting Amplifier

Ap31-OpAmp-NonInvAmp.PNG OpAMP-sch - NonInvAmp.PNG

Differential Amplifier

Ap31-OpAmp-DiffAmp.PNG OpAMP-DiffAmp.PNG

Current to Voltage Converter

Ap31-OpAmp-Curr2Volts.PNG OpAMP-sch - Curr2Volts.PNG

Editable Schematic - Rev X1

Edit this schematic for specific applications.


Revision History

  • Rev X2 - Added 6th resistor to pull the +VA input to VAA
  • Rev X1 - initial release

Single Sheet Configuration

UNI-OPAMP-08 Single Sheet

8 Channel OpAmp - Rev X1