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Prototype Friden 130 Etched Circuit Board

This un-populated prototype Friden 130 circuit board was used for testing the flow-solder process specifically relating to the plated-through holes to assure that the solder properly flowed through the holes. The test also verified that the solder provided even coverage in metal areas large (such as voltage and ground busses) and small (component pads).

The circuit board is the "H" board of the Friden 130, which, if populated, would contain the master clock oscillator, clock divider stages, and some analog circuitry relating to the generation of the digit rendition on the CRT display.

Sincere thanks to Dick Ahrens, former Friden employee, for donation of this wonderful artifact to the Old Calculator Web Museum.

Text and images Copyright ©1997-2023, Rick Bensene.