In use telephone indicator (CB8665E)

This circuit was found in a 90s Electronics Now. The circuit can use a TIC106 for the SCR.

Digital Variable Capacitor (CB189E)
The values of the capacitance between output A and ground can be programmed digitally in 18 steps...
6 V Regulator For Dynamos (CB1573E )
The circuit shown in the figure is indicated for alternative sources of energy, such as those...
Divide-by-10 Using the 4017 (NI001E)
In this simulation we use one gate of a 4093 as a low frequency oscillator producing square pulses in its...