Transmitter Test (CB23867E)

This field strength meter circuit is for testing small transmitters. The circuit is from a Radio Electronics from February 1963.

Divide-by-8 TTL (CB238E)
This circuit uses the 7493 to divide a TTL square signal by 8. The circuit must be powered from a...
Ramp generator with integrator (CB21845E)
This circuit uses a feedback integrator. We found it in Ferranti's transistor manual from 1974....
Current shield RS232 (CB8075E)
Found in a Popular Electronics from the 9s, this circuit has output for RS-232 interfaces and current...