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 […]
Amplifier Circuits
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 […]
Low Impedance Input Transistor Preamplifier Circuit
This post explains about a Low Impedance Input Transistor Preamplifier Circuit which is designed especially for small audio signals like microphone, guitar pickup and other low level sources. Also, the circuit uses one NPN transistor BC109C and few resistors and capacitors as it increases the weak signal voltage so next stage amplifier can use it […]
12V Dynamic Mic Preamplifier Circuit
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 […]