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  1. A

    Purpose of cap on collector

    Hi, I made circuit from this schematic in attachment that turns on and of appliances using IR receiver TSOP1738 and CD4017. When there is a IR signal from TV remote (or other source), TSOP1738 will output 0 V, so PNP transistor will be on, so the signal will go to the CD4017 and output 1 (pin...
  2. A

    DIY Metal detector

    Hi, I have questions about this 555 metal detector circuit in attachment down below. I understand that this works in astable mode and the induction of a coil changes when there is metal near by, so frequency changes. My question is: Why is one side of inductor and resistor connected to output...
  3. A

    Transistor base-emitter voltage pulled down

    Hi, I have a question related to the circuit in the attachment down below. This is a circuit where LED's glows in music rhythm received from smartphone speaker (or any other source) that fall on electric mic. When there is no sound signal (or any other vibration near mic), Q1 transistor is on...
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