If the circuit doesn't work, add a decoupling capacitor anywhere—a 0.01μF ceramic disc, of course; they'll fix anything! Or when your circuit is broadcasting its noise, a shield will cure it; just wrap a piece of metal around the circuit, connect that shield to "ground," and watch the noise disappear! Read full article
Understanding Interference-Type Noise
How to Deal with Noise without Black Magic; There are Rational Explanations for—and Solutions to—Noise Problems
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