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Audio devices - list of circuit diagrams
A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones
author: Andy Collinson visits: 652 
A low noise pre-amplifier suitable for amplifying dynamic microphones with 200 to 600 ohm output impedance
author: Andy Collinson visits: 627 
A 12 Volt power suppiled designed for Ron's Modular Burglar Alarm. However, being a popular supply voltage this circuit will have many other uses as well
author: Ron J visits: 617 
A variable notch filter with both high and low pass filters
author: Andy Collinson visits: 617 
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: 519 
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: 512 
A low voltage preamplifier optimised for 3 Volt operation
author: Andy Collinson visits: 511 
An amplifier to drive low to medium impedance headphones built using discrete components
author: Andy Collinson visits: 476 
A classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps
author: Andy Collinson visits: 459 
A switched timer with equal make and equal space periods timing adjustable from over 6 minutes to 38 minutes
author: Andy Collinson visits: 455 |
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