Privacy policy and cookies - INCBTech uses cookies and similar technologies to help deliver the best experience on our site. Our cookies are necessary for the operation of the website, monitoring site performance and to deliver relevant content. You can visit our Privacy Centre to learn more about your online settings.


Photo Alarm with PUT (CB1306E )

    We find this circuit in a French publication of the 1980s. The circuit uses an unusual component which is a PUT (Programmable Transistor Unijunction). The 47k resistor can be changed according to the desired sensitivity. A sensitive relay can be triggered instead of the LED.