4049 Oscillator with Mark and Space (CB24857E)

With mark and space adjustment this circuit was found in November 1984 Radio Electronics. The base frequency depends on C1.

Photo Cell Amplifier (CB13097E)
Photoelectric cells can be used as sensitive light sensors. However, the low voltage they generate...
H-Bridge (CB15637E)
With the illustrated circuit we can run a DC motor in one direction or the other, depending on...
Light Relay (CB473)
In this circuit the relay triggers on when light falls onto the sensor, a common LDR. Power supply...