Pot Options:
OP: LM324N (4xOP, +/-12V) - Datasheet:
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Notice: “You can easily leave out the opamp buffer board for testing. Just connect all three outputs via 10k resistors and add a pulldown of 1k-5k from that signal to ground.” (nILS Podewski, 2008-10-02)
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The OP-Mixer PCB are available at Mikes Onlineshop
http://www.mikes-elektronikseite.de/shop_englisch/index.htm
[26.09.2008]