Centronics port D/A converters and low-pass filter

I keep all rights to those circuits myself. You may freely build those circuits to yourself and your friends, but commercial use of those circuits is not allowed. NOTE: Those circuits are old designs from time when I was not so good in electronics than I am now. All of the designs are not very good and I would do those circuits today differenly. For example the first DAC circuit is not very accururate and R2R construction would give much better performance.

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