All SIDFB Modules Completed!

We finally finished soldering the SIDFB module boards! Each board 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 total across all four boards: eighty ICs, 248 resistors, 224 capacitors, 24 transistors, and sixty connectors, for a total of 2600 soldered holes!