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Old 21st March 2012, 02:10 PM   #1
GregH2 is offline GregH2  Australia
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Default BOZ voltage drift

Hi All,

I'm trying to build a simple class A zero feedback FET amplifier you can see in this thread:

DC offset

As you will see, the front end is very like the BOZ design. I am trying to direct couple the thing (except the input), and if you read the original post in the thread you will see I have issues with the DC servo design. What I am wondering is whether I need a servo at all, or whether I could get by with a simple bias arrangement for the input fet, a bit like the BOZ.

Soooo, have any of you who have made the BOZ measured how your output voltage varies over time? Do you think that in a direct coupled version with +/- rails the output DC offset could be kept within 100mV?

Anyway, I would appreciate your thoughts if you have any experience with the BOZ or any similar design.

Thanks,

Greg.
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