ELECTRONIC_TROMBONE

Published:2009/7/13 23:23:00 Author:May | From:SeekIC

The heart of the trombone is R3, a slide potentiometer. Two gates of a quad two-input NAND gate, IC1-a and IC1-b, make up a simple audio-oscillator circuit, with R1, R3, C1, C2, and C3 setting the oscillator's frequency:The oscillator's output is buffered by IC1-c, which also supplies the drive signal for the power amplifier, IC2. The trombone's output level is set by R4. A slide handle, made of plastic or wood, should be attached to the slider of R3. The complete circuit, enclosed in a small plastic cabinet, with the three push-button switches, S1 to S3, mounted in a convenient location for playing. Just press one or more of the tone-control switches, S1 to S3, and work the slide.



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