Simple LM386 amplifier
The main part of this circuit is the LM386 amplifier chip. It also uses a transistor input to buffer the input signal and provide extra gain for the LM386. The ...
20 Watt Power Amplifier with TDA2005
This IC chip was designed specifically for use in power boosting applications in automobiles. It is self protecting against short circuits and thermal problems....
22 Watt Stereo audio Amplifier
This circuit is very basic to build and puts out great power for your car or home. Keep all leads as short as possible....
1.3W Linear Power Amplifier
Some amplifier is based around a RF transistor. In my case I will use a common NPN RF transistor called 2SC1970. You can also use other transistors like 2N4427 ...
50MHz Linear Power Amplifier
This page investigates a simple PA for 50MHz. This power amplifier will boost upp a low level signal about10-20mW
to over 100mW. The power consumption will ye...
1.5 W linear Power Amplifier
I will also explain how you can build a 1.5W PA transmitter. The project will include PCB, components and instructions how to make coils, assembly and testing. ...
Tube Headphone Amplifier E182CC
To design a Tube Headphone Amplifier we need a triode with uncommon characteristics: enough voltage gain, low internal resistance and good anodic current. My fi...
Headphone Amplifier circuits
This article discusses several opamp-based headphone amplifier circuits, including suggestions for selecting opamps, input coupling and filtering, high current ...
Hybrid Electrostatic Amplifier
The genesis for this hybrid electrostatic headphone amplifier occurred when I was in Hawaii on vacation, at a fancy hotel on Maui. Sitting at the bar on the bea...
Class A Headphone Amplifier II
I built this headphone amplifier for dynamic headphones based on my rules of proper audio design. People who know my designs will realize that this amplifer is ...
Crossfeed Headphone Amplifier
Building a headphone amplifier is like building a power amp - only the current demand is just a little bit lower (about a factor 100). Various designs can be fo...
Headphone Amplifier
the AD844 was still used, but this time the feedback loop went all the way from output and back to input. The DC servo was removed and the current source was ma...
Tube Headphone Amplifier II
This is the schematic of the final design including the tone stack but leaving out the volume, balance, and sonic controls. The right half of the circuit is Joh...
Zero Feedback Headphone Tube Amplifier
To get a low output impedance I needed to use quite a high step-down ratio (20:1); after all, the amplifier may be used with headphones of lower impedance that...
Tubes Headphone Amplifier
The amp is built according to the Morgan Jones design. In the spirit of DIY, I made a few modifications. I did not change the circuit topology at all, but used ...
50mW Class-A Headphone Amplifier
This amplifier was born out of a need to use two sets headphones with my computer's sound-card. The design presented here is a 50mW power amplifier meant for ph...
Distribution Amplifier
The Model HC 6 Headphone Console is a six channel headphone amplifier, consisting of six stereo amplifiers, two master stereo inputs and six individual stereo i...
Class-A Tube Headphone Amplifier
Pure Class-A triode OTL design and only one tube for amplification. The plate voltages should be low. The output impedance should be as low as possible and the ...
Tube Headphone Amplifier/Preamp
Tube amplifiers designed for headphones have the principal property that they can be used as preamplifiers too. In most cases, the output impedance of a tube he...
MOSFET Power amplifier
The Zen (single-ended MOSFET) amplifier was published by Nelson Pass in The Audio Amateur 1. In a subsequent issue of this magazine, Nelson slightly improved t...