I got some incredibly nice closeup pics of the OB-6 voice card (and parts of the mainboard) from a friend of a friend. They make it really easy to figure out what is going on. You can clearly see the thermistor in the VCO expo converter for example, as well as laugh a little about the fact that they use coolaudio chips (Behringer, remember?).
Pro tip: Use
http://www.smdmark.com to figure out what chips are used from their markings!
Here they are:
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| Coolaudio V2164 quad expo VCAs. Great little chip. |
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| Top left - the green chip with '33' on it is the thermistor, the K4A is a dual 3904 transistor used as an expo converter |
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| DACs, those are AD5668 8 channel 16 bit dacs |
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| Voice card slots. Notice the HCT4051 CV multiplexers in between. |
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