Timed Alarm (CB6423E)

We found this circuit in a 90's Popular Electronics. The circuit produces a loud sound if S2 is not pressed to reset.

| Clique na imagem para ampliar |

MCP6411 1 MHz Operational Amplifiers - Microchip
September 2017 - Microchip's MCP6411 operational amplifiers for frequencies up to 1 MHz are in...
Multi Optical Sensor (CB20345E)
This circuit activates a relay by activating one of a series of optical sensors that can be...
Flash Synetron Sixty (CB23723E)
This is the circuit of a commercial flash from the 60’s. We found it in a march 1961 Radio...