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 |

Sinusoidal Oscillator (CB8427E)
Found in a 90s Electronic Design, this circuit can generate sinusoidal signals from 0.1 Hz to 25...
Resistive Sensor Activating Reed Relay (CB12182E)
With the circuit shown, obtained in a 1980 publication, a reed-relay is activated with a resistive...
500 mW Amplifier TA7117P (CB18897E)
This old integrated amplifier is from a Japanese publication from 1972. The integrated circuit is...