A MIDI pedal keyboard with Program Change Function Ths project implements a MIDI pedal keyboard with Program Change Function. It can change sounds and/or effects of your musical devices (12-Sep-2005)---308
A-Weighting filter For noise measurements. Ideal for use with the AC Millivoltmeter (09-Sep-2005)---140
ABX Double Blind Audio Tester This project describes the construction of test equipment for double-blind or ABX testing of source components - preamplifiers, tuners, DACs etc (11-Sep-2005)---271
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 eliminating the dc thump.
(16-Sep-2005)---441
Audio Level Meter Audio levels can be monitored using a small panel meter with this circuit built from discrete components.
(16-Sep-2005)---442
Audio Light Modulator here is one such simple circuit in which light is modulated using a small fraction of the audio output from the speaker (11-Sep-2005)---208
Audio Perimeter Monitor Using a single cable such as speaker wire or doorbell cable, this circuit can be remotely positioned, for
example, at the bottom of a garden or garage, and used to detect all sound in that area. (19-Sep-2005)---581
Balanced Line Drivers Use these to eliminate hum for long signal leads (11-Sep-2005)---216
