Hi
Has anybody tried to build Bob Cordell's Thermaltrak feedback bias circuit in an amplifier?
Everything works OK, but the amplifier my amplifier is slighty under compensated, probably due to the fact that D1 and D2 with VAS current af app. 10mA is around 1.7mV pr degree C and should have been app 2.2mV. Has anybody an idea how to fix this, or should I revert to the normal way of building a bias spreader just using two diodes from the thermaltrak transistors?
Br Claus from Denmark
Has anybody tried to build Bob Cordell's Thermaltrak feedback bias circuit in an amplifier?
Everything works OK, but the amplifier my amplifier is slighty under compensated, probably due to the fact that D1 and D2 with VAS current af app. 10mA is around 1.7mV pr degree C and should have been app 2.2mV. Has anybody an idea how to fix this, or should I revert to the normal way of building a bias spreader just using two diodes from the thermaltrak transistors?
Br Claus from Denmark