Power Failure Alarm (CB6116E)

This circuit, suggested by an Electronics World of 1969, keeps a blinking LED for a while when a power outage occurs. Time depends on capacitor C1.

| Clique na imagem para ampliar |

Stepper motor as encoder (CB21248E)
In the figure we have the way to use a stepper motor as an encoder. Operational amplifiers can be of...
Toy siren (CB8655E)
Found in 90’s English documentation, this rising and falling siren, manually activated, drives a...
Temperature Control (CB1363E )
The sensor of this circuit is an NTC with a resistance between 200 and 1000 ohms. The resistor R1 must...