So here in this project, we are going to make a Simple Automatic Street Light Circuit using LDR and Relay, which will turn on and off the light bulb based on the lights in surroundings. This circuit ...

The normally connected (NC) lead of the relay isn't joined to the 15-V dc supply, ... If You Build A Smart Battery Charger Using a Single-Transistor Circuit, Beware the Consequences.

The first transistor computer was built in 1953 by the University of Manchester using 200 point-contact transistors, much in the style of earlier relay and vacuum-tube computers.

The relay RY1 will be turned on when 12V dc supply is applied to the circuit. The transistor T1, and hence the relay RY1, is off when the control signal input J1 is 12V. Obviously, we need a ...

A flip-flop is one of the most basic digital electronic circuits. It can most easily be built from just two transistors, although they can and have been built out of vacuum tubes, NAND and NOR gate… ...

Besides we are using 12v relay in this project. Vin pin of Arduino cannot easily supply this much current for both relay. Hence transistors are used to conduct current from Vin pin of Arduino to relay ...

This is a simple clap switch circuit with high sensitivity. The only unusual component is the single coil latching relay. While there are numerous means of generating the latching function, the ...

It can drive a variety of relays, including a reed-relay. Transistor Q1and Q2 are a simple common-emitter amplifier that increases the effective sensitivity of the 12 volt relay coil about a 100 times ...

The linked 555 article makes sense if you read it, but a normal NPN circuit to drive the relay only takes 1mA… easy for most uC’s. Then it starts talking about active low input, and how CMOS ...