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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Frequency meter (CB7485E)
Found in a 1960 Sylvania manual, this circuit is intended to measure audio signals frequency....
Proximity Sensor (CB5060E)
This proximity sensor circuit is from an 80's documentation. The used integrated circuits are...
Simple 9V Power Supply (CB4367E)
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...