Hi Owen,
Before trying a DC servo, just reference the input to ground as I mentioned. I have a circuit that is similar that I didn't get over a 50mV DC offset. I left it because other examples sat around 10 mV DC. I didn't get an on or off spike either. This could be as esy as a pair of 220K resistors from each input to ground.
The common resistor ensures equal current flow in the ccs reference diodes, match the emitter resistors. I also matched the input transistors for gain.
-Chris
Before trying a DC servo, just reference the input to ground as I mentioned. I have a circuit that is similar that I didn't get over a 50mV DC offset. I left it because other examples sat around 10 mV DC. I didn't get an on or off spike either. This could be as esy as a pair of 220K resistors from each input to ground.
The common resistor ensures equal current flow in the ccs reference diodes, match the emitter resistors. I also matched the input transistors for gain.
-Chris
thanks for clearing that up chris, I was planning on building the circuit as is and testing it before adding a dc servo (if it is really needed) Would rather get it workign before i overcomplicate it. I would probably have a working prototype now.. but i found that the battery in my multimeter is flat when i went to turn it on earler to measure soem resistors 
must have left it on or something
anyway,
i will get a new battery tommorow hopefully.
Wish me luck..lol..
Thanks,
OWen
must have left it on or something anyway,
i will get a new battery tommorow hopefully.
Wish me luck..lol..
Thanks,
OWen
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