Overvoltage Indicator (CB22007E)

Using a CA3130 operational amplifier, this circuit drives an LED when the voltage exceeds the value set in VR1.

1-Transistor Amplifier Stage II (CB19570E)
Unlike the previous one, this circuit uses only one resistor in the base polarization. The...
Electronic Christmas Tree (CB17040E)
This conventional LED effects circuit uses integrated CMOS. Today we can achieve the same effects...
1 A Flasher (CB13147E)
This circuit was found in an old American publication. It makes use of an integrated circuit...