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Old 8th July 2002, 07:12 PM   #31
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Location: Milwaukee, Wisconsin
Yes, you are correct, the open loop gain increases. What concerns me is having enough current to drive the outputs. They need about 50ma. for 5 amps out. This could be possible, as you say the input stage is not loaded by the 47R. I like it. Jens, I have not learned spice. Could you simulate this and see if it works? As far as bias stability, that is why I originally used small lateral mosfets instead of BC546, 556 as the input devices. If mounted with the output devices they have a negative tempco that would help stabilize the outputs, also a higher input impedance. 2SK216 and 2SJ79. See the first schematic in this thread.
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Old 8th July 2002, 07:15 PM   #32
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I see I used IRF 610, 9610. My first thought was to use the K216, J79. They may be better.
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