Alternating tone siren 555 (CB9202E)

Found in Radio Electronics from the 90s, this siren finds many variations on this site. The transistor must be equipped with a heat radiator.

| Clique na imagem para ampliar |

Light-controlled oscillator (CB7874E)
This circuit has the intensity of the signals controlled by the light that falls on the sensor....
Output Limited Oscillator (CB4176E)
The purpose of the diode in this oscillator circuit is to limit the amplitude of the output...
Ladder Generator (CB23757E)
We found this ladder-shaped signal generator circuit in Radio Electronics magazine from August 1966....