Electronics > Beginners
Op amp selection help.
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.
Navigation
[0] Message Index
[*] Previous page
Go to full version