Make a 9V Battery Powered Function Generator
Often in synth-DIY trouble-shooting and/or circuit experimentation, a signal source with variable frequency and amplitude is just what you need to test a circuit's behavior. If the signal source has a variety of wave-shapes, it will serve in more scenarios. This article will present a 9V battery-powered function generator that outputs sine, square, and triangle waveforms. The frequency is adjustable from about 20 Hertz to about 11KHz and the output level can be varied from 0 to about 3V, peak to peak.
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