Alarm Siren 4001 (CB24391B)

This monotone alarm oscillator circuit was found in July 1975 Radio Electronics magazine. Power is supplied by the output transistor.

| Clique na imagem para ampliar |

BCD to analog converter (CB9596E)
This circuit converts BCD inputs to analog voltages. The operational amplifier must be powered...
Oscilloscope Calibrator (CB3952E)
This circuit is suitable for the calibration of old analog oscilloscopes. It was found in...
Sony TE2 Hearing Aid Amplifier (CB18366E)
This is the circuit of a hearing aid amplifier manufactured by Sony in the 1960s. The circuit was...