OpAmp Breakout

**Replacement: **BOB-09816. This is an older version of the Op Amp breakout board, shown here for historical purposes. The new version uses a surface mount potentiometer for gain adjustments instead of the larger, through-hole component.

This is a simple Op Amp breakout board, set up as a 2-stage amplifier with a gain of 100 (gain of 10 for each stage). The on-board trim pot sets the signal level between the stages, not the feedback path. The bandwidth is set to 15.9kHz by a pair of feedback capacitors, or over 100kHz with the caps removed. The LMV358 opamp can source up to 160mA and works well as a low impedance driver/buffer.

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  • tbrkfd1 / about 12 years ago / 1

    Oops! There is a 10k on the input. Additionally, jumper C5 and C6 to work woth DC.

  • tbrkfd1 / about 12 years ago / 1

    Jumper that input cap so it will work with DC; maybe a solder pad jumper. I'd like to see a neg voltage on the op-amp so it could be used for null or used for offsetting the input. Maybe a current limiting res on the input too. Thanks.

    • Member #336163 / about 10 years ago / 1

      Could you explain this for me? How do I make this work with DC? I 'bridge' or jumper the input terminal....but connect it to what exactly? Thanks

  • jonricmd / about 13 years ago / 1

    @ aws
    I'm a noob, how can you tell from the schematic that it is AC?

    • Nameless / about 13 years ago / 1

      There's a capacitor (C5) on the IN line and capacitors only pass AC.

  • aws / about 13 years ago / 1

    Note that it only passes AC signals (see schematic)

  • jepler / about 13 years ago / 1

    The 3 thru-holes visible on the bottom right of the board appear to be for the pot (schematic R7).

  • DaveMonster / about 13 years ago / 1

    what do the pins on the bottom go to?

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