To begin with, this project is about a simple 12V Dynamic Mic Preamplifier Circuit which uses two NPN transistors BC549 and to increase very small audio signal from a dynamic microphone. Moreover, the circuit gives enough gain so we can feed the signal to an amplifier or recording system and also it works on 12V […]
Amplifier Circuits
UJT Based High Voltage Mini Audio Amplifier Circuit
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 […]
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 […]
How to Replace IC TDA2050 with LM1875 IC in Audio Amplifier Circuit
In this article, I will explain How to Replace IC TDA2050 with LM1875 IC in Audio Amplifier Circuit. Many people use TDA2050 for 35W amplifier, but it is considered obsolete and has been discontinued by the original manufacturer but it might be available in online market as many user wants this IC for better sound […]
Transistor Based Audio Amplifier Circuit
A Transistor Based Audio Amplifier Circuit is a simple and useful audio circuit that increases weak audio signals into a louder sound signal. This circuit uses four transistors, namely two BC547 NPN transistors and two BC557 PNP transistors, because of its simple design, students and beginners can easily understand and build it. Moreover, this circuit […]