The Crazy Looper is a small hand held device that allows you to create real-time noise loops with a fast modulation metallic effect. It’s a simple microcontroller project that I give an easy to build rating.

 
Source: rarebeasts

A VU meter is often included in audio equipment to display a signal level in Volume Units; the device is sometimes also called volume indicator (VI). In this project we are building a basic and low cost LED VU Metre circuit . The extent (range) display is -18 dBu to +3 dBu, spread over [...]

The NP-100v12 is a simple headphone amplifier that allows an entry level builder to experience assembling and listening to their own creation. I use the term builder as electronic experience combined with innovation which allows the creation of a device, rather than simple board stuffing. This amplifier can take on many shapes and sizes; I [...]

Three small simple audio generator, producing a square wave, sine and triangular outputs on three separate waveform selectable via a small three-position switch or through a small mixer single output. These arrangements are based on the use of an ASIC, the ICL8038 (Intersil or Harris), also available under reference XR8038 (Exar). This circuit contains almost [...]

The following construction has just two features ideal for basic testing and troubleshooting on audio devices.
Here low-frequency generator of structure / trackers offers the following uses: In function generator allows the injection of low-frequency signals in the way of audio devices such as amplifiers.Contrast,in low-frequency trackers feature allows you to listen to any low-frequency audio [...]

Some time ago I bought a pair of in ear headphones and I am very pleased with them, but I don’t have a decent headphone amplifier for them at home. So I searched the web and became very interested in building a headphone amplifier BUF634 and OPA627 combination. I decided to [...]

PA100 GC – 100W per channel, 2x LM3886 in parallel power amplifier
This amplifier is based on the PA100 parallel amplifier detailed in National Semiconductor’s application note – AN1192.
Since my DIY speaker is 4-ohm and somewhat difficult to drive, I want to have a more powerful amplifier to match with it. Therefore I designed this [...]

After I built several LM3875 and LM3886 gainclone amplifiers, I was totally impressed by their audiophile sound quality. Then I saw the Jeff Rowland Power Amplifiers that use LM3886, I decided to create my own version – the BPA300. My design goal is to create a audio power amplifier that can deliver 300W into my [...]

This article descripts, how I built amplifier from Mr. Marshall Leach known like “The Leach Amp”. I built amplifier from the original instructions on these pages:http://users.ece.gatech.edu/~mleach/lowtim/. Article about bulding of this amplifier I found later in journal A_Radio Praktická elektronika 11/2002. For many years I looked for construction of HiFi amplifier wit a good parameters, enough [...]

Download eagle files: Small Audio Amplifier

This circuit is for detecting any audio signal with justable noise offset. It could be used to generate a radio mute signal eg. from a PDA.
The circuit is consisting of:
- Input impedance
- Signal amplifier
- Rectifier
- Justable comparator (Noise offset).

Download: Schematic Source: KKelektronik-4u