Intermittent Oscillator or Siren (CB18276E)

The basic siren configuration shown in figure 1 activates a piezoelectric transducer and can be used as an alert or warning device.

| Clique na imagem para ampliar |

Micro Power LED (CB15111E)
This circuit causes an LED to flash at a frequency determined by the capacitor. The circuit has an...
Audio oscillator (CB9083E)
Found in American documentation from the 1980s, this circuit uses transistors from that time. It...
Hall Lamp Timer (CB16406E)
This very interesting project was obtained in a 1980 publication. It consists of a device that is...