Laser source diode (CB7840E)

This circuit for battery powered laser diodes was found in a 1992 RE Experimenters Handbook. The circuit uses common components today.

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Automatic Secrecy Monitor For Phone (CB6881E)
The circuit shown, found in a 2004 documentation, allows the use of a telephone, without the...
Pulse width modulator (CB8241E)
We found this circuit in a 90s Popular Electronics. The circuit can be implemented with modern...
Remote Tuning Receiver (CB23773E)
We found this circuit in Radio Electronics magazine from May 1967. The circuit has the tuned...