Table of Contents
MIDIBox AY 3 8912 Mixer
- OP AMP Mixer (Tone ABC) for the MIDIBox AY 3 8912 (Ver. 1a)
Notes:
- 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 /
Download: Eagle 5.1 Files + Partlist - MIDIBox AY 3 8912 Mixer (Ver.1a)
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MASTER VOLUME POT
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No OP MIXER Option
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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PCB
The OP-Mixer PCB are available at Mikes Onlineshop
http://www.mikes-elektronikseite.de/shop_englisch/index.htm
[26.09.2008]