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the schematic posted by #6:
I would make those changes:
a) replace R2 with R14//R15 for better DC balance.
b) eliminate r7, r8 and vt4: the VAS dc working point is not well defined with them.
c) eliminate c1/c2/c3 and e2. put a ceramic cap on the collector and base of vt5
d) replace vd1/vd2 with an LED, and adjust R5 accordingly. Change r6 so the LED runs at about 5ma.
e) put in a decoupling network on both +/- 48v rails. two 1k resistors will do just fine here.
f) |
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