Yet another MAX525 AOUT

[latigid on]

 

 

 

 

 

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.