Electronics > Beginners
moving coil meter, biasing to bipolar
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Thanks agin!

I breadboarded together a small circuit using an NE5532 op amp.

It works exactly as planned. I can set an arbitrary bias point using a multiturn trimmer, and also amplify the AC component of the signal.

Are there any obvious pitfalls in the circuit ?
I routed a PCB which i would otherwise go ahead and etch :)

R1 and R2 may have different values, especially R2 would have a much lower value, in order to make the bias point adjustments using R4 less harsh.
Using R3 i can amplify the slowly varying AC to taste.
I included C4 just as a matter of course to prevent any oscillations, it may have a larger value, as the meter is only usable  to max ~10 Hz. Is this worth anyway ?
I did not see any other way of "AC coupling" 300mHz without using enormous capacitor values...C3 - may be smaller, but i guess it needs to be several µF anyway...

Regards and Thanks!
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