Touch on off switch (CB9519E)

Found in a Hands-On Electornics, this touch biestable can control loads that depend on the SCR. The power source must use an isolation transformer.

1 MHz FET Oscillator (CB6148E)
This circuit was obtained from HAM Radio magazine in an 80's issue. The FETs are types of the time...
Noise generator (CB8009E)
This circuit generates noise pulses for audio equipment probes. The circuit is from a 90’s 303...
Optical FM Transmitter (CB8864E)
This circuit was found in a 1970s General Electric documentation. This circuit already used an...