Send and Receive (1975)
Unlike the 1973 version of this module, the 1975 uses half of the generic "MIX" PCB. Components are placed on both sides of the PCB, some component leads being used to supplement the PCB tracks. The RECEIVE section is non-inverting, has an adjustable gain from 0 to 10, and is DC coupled.
The SEND section remains a mystery, as I have never seen an unmodified version. Most likely it is a passive resistive voltage divider.
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