Yes same question, important for me. Why does it sometimes Work without a pulldown resistor and sometimes the mosfet stay charged like a capacitor and wont close anymore ?
@@lieblingsfarbe4453 I've noticed this as well when building a circuit to measure frequency and duty cycle of high voltage. I had the input wire on the base of the transistor and I could accurately read it without touching the wire. I could also read it when touching the wire and just getting near a power source with my hand. A high value resistor solved the over sensitivity. Floating pins are fun but not a good practice. Having a positive wire running close to the gate could have been just enough magnetic field to hold it high... who knows.
Nice to see at 9:05 the correct polarity applied to the Attiny85.
dont you need a bleed resistor fromm gate to ground? or does attiny have inbuilt pulldown resistor
Yes same question, important for me. Why does it sometimes Work without a pulldown resistor and sometimes the mosfet stay charged like a capacitor and wont close anymore ?
@@lieblingsfarbe4453 I've noticed this as well when building a circuit to measure frequency and duty cycle of high voltage. I had the input wire on the base of the transistor and I could accurately read it without touching the wire. I could also read it when touching the wire and just getting near a power source with my hand. A high value resistor solved the over sensitivity. Floating pins are fun but not a good practice. Having a positive wire running close to the gate could have been just enough magnetic field to hold it high... who knows.
however when mosfets fail they may create shorts and burn the hell out of the circuit
you can always use an optocoupler to switch the mosfet.
so confusing. waited 11 mins to be even more confused after the waffle.
completely missed the simple part...