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27th September 2007, 09:19 AM
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diyAudio Member
Join Date: May 2005
Location: delta quadrant
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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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