Complete SIDFB Module

By Sauraen in MIDIbox Gallery,
This is one of the four SIDFB module boards that will be in MIDIbox ASIDITY. It contains two SIDs and their shift registers; a CD4052-based digitally-controlled filter capacitor switching circuit, 4 pairs capacitors per SID; LM1973-based digitally-controlled audio attenuators controlling feedback to self, feedback to other SID on the board, feedback to SID on next board, external audio output, and master L and R outputs; and the mixer circuit for all the feedback inputs (and external input) to each SID. The boards are custom-manufactured. The board contains twenty ICs, sixty-two resistors, fifty-six capacitors, six transistors, and fifteen connectors, for a total of 650 holes.