14 Watt Audio Amplifier

The audio amplifier shown below provides 14 watts of power, but can provide much more simply by increasing the power supply voltage. This amp was built in 1975 ...

Soundblaster Preamp

The Sound Blaster 16 PCI and Sound Blaster 16 ISA do not have a very sensitive microphone input. This little one transistor amplifier is powered directly from t...

2W Amplifier

Designed for self-powered 8, 4 & 2 Ohm loudspeakers. This amplifier was designed to be self-contained in a small loudspeaker box. It can be feed by Walkman,...

Headphone Amplifier

Can be directly connected to CD players, tuners and tape recorders. Tested with several headphone models of different impedance: 32, 100, 245, 300, 600 & 20...

Headphone Amplifier

High Quality unit with LM833 or NE5532 Low noise Dual Op-amp. No need for a preamplifier. # Can be directly connected to CD players, tuners and tape recorders....

simple mic preamp

this is a very easy circuit to build - all parts can be found at the local electronics shop....

electret mike amp

This circuit amplifies the output of a regular electret condensor microphone quite nicely.. adjust sensitivity by turning R1...

Amp with Tone Controls & Soft Switching

Built around an LM380, this amplifier includes tone controls and electronic "soft switching". The soft switching circuitry ensures power is built up gradually e...

100W Class-A//AB Amplifier

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker. This circuit developed out of my 30+ years of JLH class-A based investigation...

50 Watt Power Amplifier

The supply voltage should be about +/- 35 Volts at full load, which will let this little guy provide a maximum of 56 Watts (rated minimum output at 25 degrees C...

Balanced Microphone Preamp

The design consists of differential compound pairs of transistors with a common mode (floating) gain control connecting the emitters of the pair. The compound p...

Soft Start For Amps

The delay time for all circuits shown has been revised. The optimum is around 100ms - sufficient for around 5 full cycles at 50Hz, or 6 cycles at 60Hz. It is al...

24 Watt Audio Amplifier

The 24 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround ...

Stereo Amplifier

No Description available....

Two Transistors Audio Amplifier

No description available....

Stereo Headphone Amplifier

Both halves of the circuit are identical. Both inputs have a dc path to ground via the input 47k control which should be a dual log type potentiometer. The bala...

Audison LR604XR car audio amplifier

If the amp is built on bipolar transistors, and the preamp/crossover on FETs, then they were designed by different guys, right? Not this amp. Here, a strong, ex...

Pushpull Amp

With all DHT stages (all tubes from Svetlana 1970-s). OK, the input/splitter are not DHT`s but DHP`s - 4P1L - triode wired. Mullard 3-tube input/splitter topolo...

Class-A 100W Amplifier

A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker. This circuit developed out of my 30+ years of JLH class-A based investigations...

Low impedance microphone amplifier

The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don`t bui...