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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12 V Monitor (CB859E)
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
DC Motor Control (CB20442E)
This motor control using transistors was found in a recent English publication. The circuit is for...
Small Electronic Organ 4093 (CB13188E)
In the figure we have an electronic toy organ that can both serve to amuse children as a basis for...