To begin with, the circuit in this article shows a simple high voltage mini audio amplifier which uses one UJT transistor Q1 2N2646 and one power transistor Q2 AC187. This UJT Based High Voltage Mini Audio Amplifier Circuit works with a high supply of around +125V and it can drive a small 4 ohm speaker […]
DIY Projects
Transformerless Audio Amplifier Circuit using Germanium Transistor
In this post we will understand about a simple power amplifier circuit using AC176 and AC126 type PNP germanium transistor in OTL (output transformer less) design. Also, this circuit gives audio power directly to speaker without output transformer, it is low voltage circuit and works with 9V battery. Therefore, the circuit design is easy and […]
Low Impedance Driver Circuit using BJT Transistor
To begin with, this circuit shows a small audio amplifier which uses two BJT NPN transistors, they works with low impedance output like small speaker or earphone. Also, the circuit takes weak input signal and makes it stronger and runs on DC supply from +6V to +18V, as the circuit is simple, low cost and […]
Simple Adjustable Power Supply Circuit using Two Transistors
This Simple Adjustable Power Supply Circuit using Two Transistors is a simple power supply circuit, which can change the output voltage by using two transistors like BD140 and MJ2955 to control the voltage. What is a Adjustable Power Supply Circuit: Adjustable power supply circuit is an electric circuit which uses two transistors to change and […]
Simple Magnetic Field Sensor Circuit
This is an Easy and Simple Magnetic Field Sensor Circuit, which can find magnet near the sensor. Furthermore, this circuit is easy to make and is good for beginners, where we can learn how it work and also we can use in small projects which are very fun and useful! What is a Magnetic Field […]
Flashlight Activated Remote Control Circuit
This project show how to make a Flashlight Activated Remote Control Circuit where we can turn it ON using flashlight. Also, the circuit uses a light sensor built with a transistor and a special LDR that detects flashlight. Furthermore, this article tell step-by-step guide how to build flashlight remote circuit and how to use it. […]