opto-coupler

Hi I have a SMPS thats not works (full off. Just voltage on main capacitor is ~300VDC) even by replacing PWM chip and TL431 and optocoupler. Also I tested FET and it is healthy. Also when measuring IC supply voltage it is about mili-volts. My question is there are a way to place a temporary...

I have developed a dimmer circuit for 1000w halogen lamp.... But the problem is that when voltage applied to lamp is less than 200v,it works perfectly. But when i increase voltage to 220v or connect circuit at nearest point to the power supply, the optocoupler stop wokering..... I have used two...

I want to create a 24v to 12v buck converter. I am trying to control mosfet with optocouplör. I have 25kHz-50kHz pwm signal from arduino/pic16f877A. I have some mosfets like IRFZ44N, IRF540N IRF4905 and etc. I am using PC817 opto but I guess it is not suitable for high frequency pwm like 25kHz...

I made igbt high side gate driver circuit. However i couldnt step up the gate Voltage. What should i do?

Hey guys I'm trying to measure the speed of a small DC motor using a rotary encoder and an OPTO sensor, and counter input on myDAQ. Here's my circuit on the breadboard. The Collector pin of the transistor is connected to the DIO1 port of the myDAQ. And here's the LabVIEW code. On the...

I'm looking to use an optocoupler+MOSFET to switch "undefined" DC power sources; the opto I'm looking at is FOD817D and the MOSFET is FDPF55N06. The power sources may range from 5V (USB power) to 24V, but I could see this being used to switch as high as 36V at some point in the future, and...

I'm currently doing my master thesis, and I'm now at a point where I have to control a few AC motors with a microcontroller. From my previous study about the subject, and from previous similar thesis, I've noticed a common practice is to use an optocoupler to separate low voltage from high...

Hello everybody. I am trying to increase my power Supply's default 12V 3.3A output to something like 20V 3A. I Decided to use a potential resistor via the shunt regulator at the opto-coupler which i was sure it had. But the problem is that when i opened the power supply, most of the output...