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Audio devices - list of circuit diagrams
The GEM is an audio power amplifier embodying simultaneously active Class A and Class AB output stages for 100+ Watts into a 4 ohm loudspeaker. The front end pcb will drive up to 100+W variants, or the 200+ Watts version into a 4 ohm loudspeaker load.
author: Graham Maynard visits: 265 
A Class A // Class AB amplifier rated 100 Watts when driving a 4 ohm loudspeaker
author: Graham Maynard visits: 244 
This is a 1-amp variable-voltage PSU. It adjusts from about 3v to 24v: and has the added feature that you can limit the maximum output current. This is invaluable when (for example) you power-up a project for the first time or soak-test a piece of equipment.
author: Ron J visits: 237 
A hifi preamplifier designed to convert high output impedance amplifiers to 600 ohm outputs
author: Graham Maynard visits: 232 
A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones
author: Andy Collinson visits: 220 
In its simplest form, a voice-over unit is just a microphone and change-over switch feeding an amplifier, the output from the microphone having priority over the amplifiers audio signal when the "push-to-talk" switch is pressed. In this circuit, a preamplifier immediately follows the microphone and is designed to be used some distance away from the main amplifier
author: visits: 216 
This analogue pre-amp is a tested design providing not just both a cleaner and quieter background to the music we are meant to hear, but also an optimisable clarity of reproduction that few are likely to have heard before, or even imagined could ever have become a realisable experience
author: Graham Maynard visits: 213 
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.
author: visits: 204 
An amplifier to drive low to medium impedance headphones built using discrete components
author: Andy Collinson visits: 193 |
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