These we 44Khz 8bit digital recorders, the small PCB one plugged in to my home made Eprom programmer and used it Digital I/O lines on my TRS80 Color Computer.
These were Aluminum jigs I made to hold the 18 resistors in place while we soldered them together without a PCB. We made 3000 units this way.
These 18 Resistors formed an R-2R network. In my case I chose 50K Ohm and 100K Ohm.
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