[sdiy] Circuit purpose?

John Henson synthnerd at eircom.net
Tue Mar 18 02:55:36 CET 2014

I have seen similar circuit topologies over the years in many areas, but 
this looks like an audio line out circuit which is one component more 
complicated than it needs to be. The 680R resistor represents the 600 
Ohm output impedance (it's the cheapest nearest value) the back to back 
Electro Caps to behave like a Bi-Polar, and the obligatory 100k to 
Ground to stop charge on the last Cap causing clicks and bangs when 
plugging connectors in and out.
If this is something you want to work with, go with 680R resistor from 
the Op-Amp output connected to Bi-Polar cap and 100k to Ground after this.

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