Problem z modułem MOSFET PWM

elmaya · Post Sun Mar 06, 2022 6:06 pm

it will be enough to bridge the led diodes that are in series with the optocouplers so that it works correctly with 3.3v.
the leds are marked as IN1 - IN4.

YoMan · Post Sun Mar 06, 2022 11:35 pm

elmaya wrote: Sun Mar 06, 2022 6:06 pm it will be enough to bridge the led diodes that are in series with the optocouplers so that it works correctly with 3.3v.
the leds are marked as IN1 - IN4.

I'm sorry but I don't get it where exactly the bridge is supposed to be. Would You like to draw the bridge on the photo?

Screenshot_20220307-003335_AliExpress.jpg

elmaya · Post Mon Mar 07, 2022 8:27 am

2022030.jpg

YoMan · Post Tue Mar 08, 2022 9:33 am

elmaya wrote: Mon Mar 07, 2022 8:27 am2022030.jpg

Not working. No difference.

shimano73 · Post Tue Mar 08, 2022 9:44 am

Mi się wydaje że ta dioda która wskazał elmaya jest po stronie tranzystora, ja bym wymienił rezystor o oznaczeniu 471 czyli 470ohm zmień go na 220Ohm

YoMan · Post Tue Mar 08, 2022 10:46 am

shimano73 wrote: Tue Mar 08, 2022 9:44 am Mi się wydaje że ta dioda która wskazał elmaya jest po stronie tranzystora, ja bym wymienił rezystor o oznaczeniu 471 czyli 470ohm zmień go na 220Ohm

Co szkodzi spróbować. Testowo nie będę wymieniał tylko podłącze równolegle drugi Ok. 400-450ohm

elmaya · Post Tue Mar 08, 2022 11:00 am

equivalent to the input circuit.
By bridging Led 1, the sensitivity of the input increases by at least 1.6Vdc.

Captura de pantalla (199).png

the IN are all separate, make sure you have all the GND of the IN interconnected.

YoMan · Post Tue Mar 08, 2022 2:01 pm

elmaya wrote: Tue Mar 08, 2022 11:00 am equivalent to the input circuit.
By bridging Led 1, the sensitivity of the input increases by at least 1.6Vdc.

Captura de pantalla (199).png

the IN are all separate, make sure you have all the GND of the IN interconnected.

they are interconnected just right on the PCB, if I understand You well. Besides that I'm looking on the pictures and something seems to be different on Your diagram but ... I will check it afternoon when I have the PCB in my hands

elmaya · Post Tue Mar 08, 2022 2:49 pm

what you point out is the ground connection "DC-" for the output of the optocouplers.
check the connection between GND1, GND2, GND3, GND4 and DC- with the multimeter.

YoMan · Post Wed Mar 09, 2022 1:00 pm

elmaya wrote: Tue Mar 08, 2022 2:49 pm what you point out is the ground connection "DC-" for the output of the optocouplers.
check the connection between GND1, GND2, GND3, GND4 and DC- with the multimeter.

You were right. I've made a mistake (it was late at night) and my module has a LED in different place (picture). Something that in my mind was Your mistake was caused that the LED is after the optocoupler (not before) but it doesn't change anything. Bridge on the led solved problem, the dimmer is working but ... there's no connection between GND on input that You were writing about. What is it necessary for? (I've checked the dimmer only using the multimeter, I haven't connected the LED strip yet)