Dual tube receiver (T1600E)

This receiver employs two dual triode valves. Receiver is from a 1949 Radio Electronics. Power supply not provided.

Full cup detector (CB6956E)
This circuit was found in Popular Electronics. Its purpose is to warn the visually impaired when a glass...
Transmitter for remote control (CB21645E)
This circuit was obtained from a Popular Electronics from January 1967. It has a...
Ultrasonic Transmitter (CB18476E)
This ultrasonic transmitter was found in a 1974 documentation. The receiver is the CIR11753 or...