Over the past 56 years, operational amplifiers have changed electronics design in a big way and before that time, designers built amplifiers with many separate transistors and extra components and later, companies released op amp ICs that made amplifier circuits smaller, cheaper and easier to build. Furthermore, this project uses the popular LM324 operational amplifier […]
Audio Circuits
DIY 20W OCL Audio Amplifier Circuit
To begin with, a 20W OCL power amplifier circuit gives strong and clear audio output for home speaker systems, computer speakers and small music systems. Also, this circuit uses TDA2020 audio amplifier IC which can produce good sound quality with low distortion. Moreover, the circuit needs only few external components, so construction becomes easy for […]
Simple High Impedance JFET Preamp Circuit
Like our previous post on low and medium impedance preamplifier circuits, this tutorial shows a simple JFET preamp circuit that gives very high input impedance. The circuit works good with weak signal sources like microphone, guitar pickup or sensor and also it uses a N-channel JFET 2N5457. This Simple High Impedance JFET Preamp Circuit is […]
Low Noise Transistor Preamplifier Circuit
This simple Low Noise Transistor Preamplifier Circuit increases very small audio signals like microphone or weak music signals. Here, the circuit uses two transistors: Also, after the preamplifier, the signal becomes strong and we can send it to a power amplifier, as this circuit costs low, is easy to make and suits beginners. Circuit Working: […]
Transistor Based Medium Impedance Preamplifier Circuit
Like our previous post on the Low Impedance Input Transistor Preamplifier Circuit, we modify the same circuit to create a medium impedance preamplifier using a BC550C transistor. Moreover, this circuit increases weak audio signal and we can use it before power amplifier, also it works good for microphone, guitar, or small audio signals. Furthermore, it […]
Low Cost DIY Microphone Circuit using Normal Speaker
This project shows how we can use a normal speaker as a microphone and usually, a microphone converts sound into electrical signals. However, a speaker can also do the same work in reverse, therefore, this circuit becomes a simple and low-cost solution when we do not have a microphone. Moreover, it works well for basic […]