Direction Signal (CB25608E)

This circuit was found in the September 1993 Electronics Now magazine. It is based on the 555 and powers an audible indicator.

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60 Hz Generator (CB8451E)
This circuit synchronized by the power grid was found in a 90s Popular Electronics. Transistors are...
Proximity sensor (CB9570E)
This circuit was found in documentation from the 1980s. The circuit uses several components of the...
Simple relay drive with transistor (CB25631E)
In the figure we have a simple shield of 1 transistor. The supply voltage depends on the relay. The...