The is somewhat better: There was a very good discussion on the page below but I need a bit more assistance on R values etc.. Then you can find the current in the datasheet? Say that is 2 Volt. As the can be fed with up to 18 Volt, it shouldnt be a big problem to use the to switch. At 5 Volt GS it can however only take some 4.
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But then again, if bought at the right place. They are good switches,but you dont want to use them as resistors. Good luck with your project. You are limited to a current of about mA.
Optocoupler4N35 \ Learning \ Wiring
Suggestions on how to drive a MOSFET – Page 5
The IRF can obviously take 4 amps, but sadly it mosfst a higher voltage on its gate than the most microcontrollers can deliver i presume you will use a microcontroller. Glad to be able to contribute!
Thank you very much for this post. I’ve read more about transistors and now, may be, I can understand why I need to swap the R20 and the optotransistor.
Using MOSFETS with TTL levels (5 Volt and 3.3 Volt)
The transistor may burnt. To find out more, including how to control cookies, see here: Thank you for 4h35 clear explanation. Anything up to about 10 kHz should work OK. That is definitely enough for most applications. In general you want a MOSFET that has a low Rdson and switches fast at the available triggervoltage 5volt with ttl and ofcourse can take the voltage and current it will be exposed to.
Now you want to put current through a coil.
I don’t know if it can work and I can’t understand why the 6N is considered as an “inverting optocoupler”.
A TO package would be too hot too touch in free air with 1 to 1. Would like to have a non inverting driver, do you have any mosfeet how to solve this, or best IC driver for arduino. Post as a guest Name. Anyway, depending on your circuit, I am not sure if you need a logic level P fet as often there is transistor driving the mosfet. Should I try to use a BC for exemple to turn on the Mosfet like the schematic 3 and in this case when I put my output high the Mosfet is off, so I should put it Low to turn on my load, is it?
I had a IRF Mosfet but now i understand why it became very hot. So Q2 is the output side of the opto-couper. I dont see that situation – Arduino pin controls the opto and it is open circuit if there is no diode voltage. The driver will have only 2 inputs, allowing off, fw, rev and brake. I just need to switch on and off small DC motor. I told you to move the opto to where R20 was, and move R20 to were the opto was.
The resistor values have the following requirements: