Wednesday, June 17, 2020

Audio Byte - Parallel Port R2R Audio Adapter, Photos of Prototypes.

  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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