6 V power supply with power zener (CB21531E)

This circuit provides 6.3V of output from a 9V input. The circuit was found in a Dutch publication from 1966.

Voltage Variator LM3900 (CB5057E)
In the figure we have a circuit that allows us to obtain a variable voltage of approximately 0.5 to 25 V...
Curve plotter (CB16848E)
This interesting circuit, found in a 1997 documentation, allows you to view the characteristic curves of...
Tone Generator (CB22203E)
This circuit generates a tone whose frequency is set at VR1. The signal is reproduced in a...