This circuit was obtained in the publication 101 Electronics Projects of 1979. The circuit can be assembled easily, since all the components are common. What this circuit does is trigger a 6 or 12 V relay from the output of a 555. R1 is 1k-ohm and the transistor can be the BC548 or even BD135. The diode is 1N4148 or any general-purpose.

 


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