Linear Amplitude Modulator (CB21087E)

Found in an Analog Devices documentation from the 90s, this circuit uses a component of the time, not common nowadays.

Fan 1 to 10 minutes timer (CB17182E)
This circuit intermittently drives a fan at adjustable intervals between 1 and 10 minutes. The...
Precision current source (CB9666E)
Found in a manufacturer documentation from the 1980s, this circuit supplies currents that depend on...
Two Transistors Amplifier (CB918E)
We found this two stage transistor amplifier circuit using RC coupling in a magazine published in...