latigid on Posted December 16, 2014 Report Share Posted December 16, 2014 I started with Altitude's schem (thanks!) but changed basically all of the parts in the end. I've gone for a DIP20 MAX525 because there was plenty of space. This won't be too cheap -- the DIP20 version is about $10 more than the SSOIC20, and this is just a 4-channel board keeping in line with my other projects. The dimensions are 100x58.4 mm I've cascaded the J19 connections (hopefully not too close together) and added a chip select line for RC1/2. GND and AGND are on separate planes, joined at one point. Each output has a scale control (1/4 TL074) and a second stage (1/4 TL074) to either buffer (0->10.67 V) scale (0->5.33 V) or offset (-5.00->5.67 V). This can be configured with jumpers or a second control board. The offsets are generated by LM4040 precision references. This should be better than dividing the 12 V rail which can be fairly noisy. Each output then has a divider pot for attenuation. Power is via Eurorack style 2x5 DIL or AOUT style 3 pin SIL headers. Questions/comments are welcome. Quote Link to comment Share on other sites More sharing options...
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