Build a simple Doorbell-Controlled Porchlight Circuit Diagram . This add-on circuit automatically turns on your porchlight when your doorbell rings, so you can see the person ringing the doorbell at the doorstep. This also helps to guard against burglars, who usually press the doorbell switch to confirm that there is no one at home. By turning on the porchlight , the circuit will trick them into believing that someone is inside the home. You can easily connect the circuit to your doorbell . The light remains on for around 20 seconds and then turns off. This duration is enough for you to find your way in the dark to open the door. However, duration can be varied by changing the RC components (R1 and C2). Simple Doorbell-Controlled Porchlight Circuit Diagram When you momentarily press push-to-on DPST switch (S1), the AC mains is supplied to: 1. The doorbell via S1(b) and it rings. 2. Stepdown transformer X1 via S1(a) and it delivers 12V AC at its secondary. The secondary output is rect...