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Smart world - 555 TIMER • Pin 1. – Ground, The ground pin connects the 555 timer to the negative (0v) supply rail. • Pin 2. – Trigger, The negative input to
555 timer as a voltage controlled oscillator, duty cycle query - Electrical Engineering Stack Exchange
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How to Build a Voltage Controlled Oscillator (VCO) with a 555 Timer Chip | Voltage controlled oscillator, Electronic circuit projects, Timer