Here is a great collection of touch switch circuits. A touch switch is an electronic device that enables us to control a circuit by simply touching a sensor. Simple touch switch circuit with 4011 – ...

Ever wondered how a simple transistor can power an entire computer and run complex code? Discover the amazing world of ...

We break down the essential component of modern electronics—the transistor. Transistors are the building blocks behind most ...

The input signal level is not sharp in most sensor circuits and the transition stages are slow. So the relay driver transistor partially turns on/off . The relay coil will not become fully energized ...

For many years, we have been employing a very simple approach ... If the drive transistor’s emitter is simply connected to ground, the relay circuit draws around 58 mA. With the resistor ...

A very simple but highly efficient combination lock circuit is shown in the figure ... (binary state "1") to forward-bias the transistor, energize the relay (used in normally open mode), and ...

As it turns out, there are a few simple ways to ... to the coil of wire, the relay closes, allowing current to pass. In reality a transistor is generally added to the circuit to provide enough ...