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Old 27th September 2007, 09:19 AM   #1
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Default opamp input amp opinions to make it better

o.k. - this is the actual circuit that i am playing with...
instead of the NE5534 opamp i am using OPA627.....the power supply is +/-37Vdc ..... and i am using only one output pair of transistors for now...i will add another pair....

it is sounding quite nice.....

the question is what can be done better in this schematic....

i have few suggestions that might be done...

1. put 100nF capacitor accross c-e of BD139-16 transistor in the VAS section (or better to put 2 cap's - one accros b-e and one accros b-c)..???
2. instead of the resistor 6k8 in the input part of the amp - the one that is supplying current for the zener diode - put a ccs - would this make things a bit better....
i would like to make a better psu for the opamp using this sch...so, how can this be done that is the question...???

well....this is a brainstormer...

regards
sunny
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