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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2 transistor radio (CB22272E)
We found this circuit in an American documentation from the 60's. The transistors are made of...
Digital Capacimeter (CB4312E)
The accuracy of this circuit depends on adjustments made with capacitors of small tolerances of known...
OR function with Relay (CB19773E)
The figure shows how to implement an OR function with two inputs, using a relay. The relay...