Electronics > Beginners

Op amp selection help.

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iMo:
Do use R1=R2=10k in my schematics above. It saves you 4.5mA output current.

Sometimes it is recommended to put R1||R2 into the non-inverting opamp input (ie. 4k7).

The output voltage of the LM385 (opamp's output pin) will be 11.15V (because of the R3=100ohm) for 10.0V at "machinery input". Therefore you need 15V Vcc to have enough headroom for the opamp to work properly.


--- Quote --- I might also place a 0.01 microfarad ceramic capacitors across R4 and directly from the output of the operational amplifier to the inverting input.
--- End quote ---
It slows down the circuit however - ie see below DAC from 1V to 4V and back.

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