4046 Alarm Clock (CB25768E)

This circuit uses a PLL4046 oscillator to excite a piezoelectric ceramic. The circuit is from an October 1994 Electronics Now magazine.

| Clique na imagem para ampliar |

Battery Tester (CB16738E)
This simple battery tester uses two transistors to drive LEDs of different colors, indicating the...
Pulse Delay with the 741 (CB1426E )
The purpose of the circuit shown in the figure, obtained from a 1972 documentation, is to delay the...
Emergency Light (CB17503E)
This circuit activates an incandescent lamp (or LEDs) when the light stops hitting the sensor, which...