Opto isolator question

[john swift]

looking at the photo of the opto-isolator board
it has 3K resistors fitted as shown on the chinese circuit diagram
so the output current is even more limited

with a 3K or 3.3K resistor between the gate and source of the Fets you have you could wire the opto-isolator to pull the gate upto +12V (half of the 24V supply ) to switch the FET on



the BOB is like this I have looked at before


John

[CharlieRam]

looking at the photo of the opto-isolator board
it has 3K resistors fitted as shown on the chinese circuit diagram
so the output current is even more limited

with a 3K or 3.3K resistor between the gate and source of the Fets you have you could wire the opto-isolator to pull the gate upto +12V (half of the 24V supply ) to switch the FET on



the BOB is like this I have looked at before


John

Cheers John, look what I just found... seems I may as well use them as I have them lying around

Sent from my SM-G920F using Tapatalk

[john swift]

it looks like you have all the parts to try it out with the FET

the combination of the high value resistors and the gate source capacitance is going to slow the FETs switching but for this application it should be OK

I usually use a 100 ohm resistor to connect the gate to a low impeadance driver
(very like the 100 ohm "grid stopper" with valve (tube) circuits )

John