Is it fair to say that the Zobel network is just the 2.7 ohm resistor and 0.1uF cap, while the 500uF cap is to AC-couple the output of the amplifier and remove the DC offset from having only a positive power supply ?

EDIT - never mind, minie already figured that out and was only asking about the RC portion. Sorry, couldn't see original email while responding...

I wondered for a minute why there was no input capacitor but checking the data sheet I found:

Quote:
A unique input stage allows ground referenced input signals. The output automatically self-centers to one-half the supply voltage.

AFAICS the 5uF cap does not directly filter the power supply, instead it filters a "half supply voltage" reference generated on the chip. If you look at the National data sheet you can see the internal schematic of the chip:

LM384 http://pdf1.alldatasheet.com/datasheet-pdf/view/8886/NSC/LM384.html

Last edited by bridgman; 03/15/17 04:58 AM.
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