Manual Clock 7400 (CB22411E)

This circuit to produce clock pulses is manually driven. The circuit is TTL and must be powered by 5 V.

Linear photometer (CB20721E)
Found in American documentation from the 1970s, this circuit employs an integrated circuit from...
Short Wave Micro Transmitter (CB529E)
This transmitter uses a small loudespeaker (FTE) as microphone and can send the signals to...
Operational Amplifiers Test (CB1500E )
We found this circuit in a 1977 publication. With it we can test general purpose operational...