Undervoltage alarm (CB8480E)

This circuit sounds when the input voltage drops below the value determined by the zener. The circuit is from a 90s American documentation.

| Clique na imagem para ampliar |

Astable with the Operational LM3900 (CB4511E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
Electronic Alarm Clock (CB18726E)
The purpose of this circuit is to trigger an oscillator with the light of dawn. The tone of the...
Fast Inverter Amplifier (CB20146E)
This fast inverter amplifier with high input impedance uses operational amplifiers from the 80's,...