Electronic Basics #26: 555 Timer IC
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Electronic Basics #27: ADC (Analog to Digital Converter)
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Using the 555 Timer
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Is My Turntable Any Good? The Tweak I Can't Un-Hear!
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EEVblog #555 - 555 Timer Kit
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Electronic Basics #31: Schottky Diode & Zener Diode
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555 Timer Modes Explained - The Learning Circuit
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