Simple Relay Shield (CB21223E)

This circuit was found in old American documentation. Transistor is general purpose and relay is according to power.

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Comparator with Transistors (CB6550E)
This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced...
XR2206 sinusoidal generator with modified range (CB24497E)
The figure shows how to use the XR2206 to generate sinusoidal signals in a different way. The...
JFET Headphone Amplifier (CB25567E)
This headphone amplifier has good gain and high input impedance. The circuit is from Electronics Now and...