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  1. T

    Transistor voltage measurement

    By using voltmeter. How to measure the voltage of collector and emitter. Vbc is the collector voltage and Vbe is the emitter voltage? And how should my voltmeter place? Sorry for the silly question
  2. T

    Connection knowledge

    Can someone explain to me in details how does this circuit will works. That one is npn transistor. The red wire from the collector is connectwd to pin2 (trigger).So when someone pass through the ir phototransistor and buzzer will sounds.
  3. T

    Adjustable timer circuit

    Can someone help me check whether this circuit will work? :) if yes,i will be build this project within this week
  4. T

    Motion detector circuit

    Basically there are few questions i want to ask : 1) For the transmitter circuit set the frequency to 5kHz? 2) Is the capacitor (100uf) before the speaker is necessary? 3)Is the capacitor (0.01uf) for the NE555 timer's pin5 is necessary? 4) Does resistor is necessary to place before the...
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