1-cycle-per-30-day oscillator (CB26073E)

This extremely slow circuit produces one pulse per month and can be used in a timer. We found it in the November 1998 Electronics Now magazine.

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Water Pump Automatic Control (CB17655E)
This is a reservoir level control project, in this case, using 4 sensors so that 4 different...
SCR Inverter (CB12447E)
This circuit, obtained in a 1994 documentation, uses an SCR in a relaxation oscillator to raise the...
Variable Power Supply for the Experimenter (CB16079E)
The power supply shown in the figure provides voltages between 0 and approximately 15 volts, with...