280 Watt MOSFET Power Amplifier
This amplifier is designed to be as flexible as possible, with no bad habits. Indeed, it will operate stably with supply voltages as low as +/-5V (completely po...
Headphone Class-A Power Amplifier
Class-A is ideal for this application, since headphones are such an intimate way of listening. An amplifier for 'phones should be as clean and free from crossov...
4x15Watt 12volt power audio amplifier
While I would have liked a 4 channel chip with about 20 Watt per channel, the local parts store didn't have any yet, so I opted for two TA8215AH stereo chips, s...
Microphone Preamplifier BC547B
This is a simple microphone preamplifier circuit which you can use between your microphone and stereo amplifier. This circuit amplifier microphone suitable for ...
amplifier delay output relay
This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the ...
Stereo headphone amplifier
The ping of the cymbals, crack of the snare drum, thonk of the bass - none of these comes through on my low-budget speakers. Sometimes they sound so fuzzy I wan...
Valve high-gain stereo preamp
A cathode follower based on the 6BL7 or 6BX7 is ideal for output. I used a mu-follower circuit with no feedback, a 12SN7 as the gain stage, and a 6BL7 as the ca...
Valve audio headphones Amplifier
The tube headphone amplifier in figure 1 is a high current mu follower, with a 12AU7 cathode follower driven by a 6CG7. Both sections of each tube are parallele...
Quality Headphone Amplifier
It is a single stage class A MOSFET design with the right gain and a low output impedance. Here we don't have the limitations of the Zen amps (at least in the ...
Headphone electrostatic JFET Amplifier
The amplifier operates primarily in the current domain. The first stage is a voltage controlled current sink. The second stage is a current-controlled voltage s...
MOSFET Headphone amplifier
The circuit described in this article is a MOSFET follower for driving headphones. FET followers can supply high current, but have a voltage gain of slightly le...
50 Watt power Amplifier with preamplifier and headphone output
The amplifier drives a pair of loudspeakers using two LM3876 integrated power amp ICs (50 watts per channel), or a pair of headphones via a Meier crossfeed filt...
Class A 2A3 audio Amplifier
The input stage is comprised of a both halves of a 6SL7 octal dual hi-mu triode in a differential amp configuration with a 1ma constant current cathode load. I'...
Push-Pull Class A Amplifier
This stero amp will give you 4-8W/ch of zero feedback triode power for less than a pair of Chinese 300B's ...if you know where to shop. For those of you who are...
Audio Signal Testing amplifier
This mini audio amplifier will test the audio stages in amplifiers such as the front end of FM bugs. You can also use it on lots of our other projects as well a...
HF 1-30MHz linear amplifier
This project was a particular surprise for me in that the BC547 (equiv 2N2222) can be used to build a 500mW linear amplifer covering the entire HF band with exc...
10 Watt CB Linear amplifier
It is quite easy to get a watt or more with very simple equipment, but to get more than 5 watts becomes a little more difficult. This article describes a 10 wat...
4 Watt audio Amplifier
The circuit is very simple and incorporates darlington output transistors that will provide more than enough output current than is needed to drive a 3-ohm spea...
450 watts / 3.5-30 MHz Linear amplifier
This is the circuit of a 500 watt linear amplifier, based upon a design by Frits Geerligs, PA0FRI, who has his own homepage at http://home.planet.nl/~fhvgeerlig...
Headphone Buffer Amplifier
This simple amplifier is ideal for adding a headphone jack to equipment that lacks this feature. The Headphone Buffer circuit board is small enough (1.2" X 1.4"...