MIDIbox

• OP AMP Mixer (Tone ABC) for the MIDIBox AY 3 8912

• Pot R4 (Volume Tone A), R5 (Volume Tone B) and R6 (Volume Tone C) are designed for volume finetuning (not for turning off tone A/B/C)

Pot Options:

• R4, R5, R6 = 100k (less volume)
• R4, R5, R6 = 220k (more volume)

OP: LM324N (4xOP, +/-12V) - Datasheet:

• ⇒ LM324N.pdf /
• ⇒ lm324.pdf

This Board was etched by PCB-Mike

• PCB-Mike ⇒ www.mikes-elektronikseite.de

mbay_eagle.zip

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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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[07.10.2008]