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.

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Photocell Motor Control (CB14945E)
In the figure we have the photo-conductive way of using a photocell to control a small motor with...
One Transistor Timer BC548 (CB791E)
Pressing S1 the LED glows by a time interval depending on the capacitor. Time intervals in the...
Crowbar (CB15667E)
This is a protection circuit in which, under excess current in the load, the SCR trips by shorting the...