Sometimes water tank gets full which is a common problem But we forget to switch OFF the motor, because of this water gets wasted. So, this simple Transistor Based Water Level Alarm Circuit is useful. It gives sound alert when water reaches a level. Moreover, the circuit is cheap and easy to build as it […]
Transistor Circuits
Simple Two Transistor Buzzer Circuit
A buzzer is a small sound making device that is used in alarms, toys, and indicators. This Simple Two Transistor Buzzer Circuit is very simple and easy to make. It uses only two transistors and therefore, it is good for beginners. Also, it works with low voltage and because of this it is safe to […]
Fan Start 10 Second Delay Timer Circuit
In many homes and industries sometimes a fan does not turn ON immediately. A fan start delay timer is a circuit that delays the fan start. When power is applied the fan stays OFF and after some fixed time the fan turns ON automatically. In this circuit the delay time is about 10 seconds and […]
30 Minute Delay Timer Circuit using Transistors
This article explains a simple 30 Minute Delay Timer Circuit using Transistors. The circuit is with low cost and is easy to build. It uses common parts like BC547 transistors, resistor and capacitor. Because of simple design, beginners can also understand it easily. This circuit is useful where delayed switching is required. For example, light […]
Transistor Based Coin Toss Game Circuit
Sometimes we need to make a quick decision but choosing is not easy, so we flip a coin. Now imagine doing the same with electronics. This Transistor Based Coin Toss Game Circuit works like a real coin toss and it gives random result every time. When power is applied, no one knows the result. One […]
Transistor Based LED Chasing Flashing Circuit
A Transistor Based LED Chasing Flashing Circuit is a simple and interesting project. This circuit turns LEDs ON and OFF one by one, so it is called a chaser circuit. Simple transistors are used instead of ICs which the beginners can understand it easily. It is mainly used for learning and decoration. The components are […]