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votes
2answers
341 views

How to increase the dimming range of mosfet controlled LED

I'm slowly getting into circuits and I've put together a PWM LED dimmer. The led is driven by this circuit: I'm driving the PWM via a separate BLE device which maps a user input of [0, 100] to an 8 ...
1
vote
1answer
1k views

Can a MOSFET be used for dimming instead of switching a LED?

I have a simple circuit that uses a MOSFET to switch on and off a ~100W LED spotlight (30V, 3A). It works for this application. I have been asked to modify the circuit so that the LED can be dimmed ...
-2
votes
2answers
516 views

High frequency p-channel mosfet pwm dimmer problem

The circuit below is the final one, after all the advice from Mishyoshi and especially Andy aka. It includes Zener diode protection against over-voltage between gate and source on the Mos-fets and ...
-2
votes
3answers
499 views

Hot Mosfet IRL540N with Gate 5v and Source 12v-260 mA [closed]

I've connected the + of a 12v powersupply to a 12v LED-spot. The - of the LED-spot is connected to the source of a IRL540N mosfet. The drain is connect to the - of the 12v power supply and the ground ...
3
votes
2answers
458 views

Connecting two LED stripts with individual power sources to one MOSFET

I have two LED strips (IKEA's Ledberg white), each with their own 24V power supply and I want to make them dimmable with an Arduino. I was wondering if it is safe to connect both of them (their ...
1
vote
1answer
3k views

Using optocoupler with MOSFET for dimming a LED

I have a blue LED which I want to dim using an Arduino, an optocoupler and an N-MOSFET. For achieving this I assembled the circuit on a breadboard as shown in the pictures, using a YwRobot breadboard ...
3
votes
1answer
1k views

Using PWM to dim LEDs

Our high school theater is hosting a production, and a big part of the set is a giant turntable. It's going to be cool and all, but I've been challenged with controlling LED strips on the turntable ...
0
votes
1answer
10k views

Using two Mosfets for AC

Im having trouble getting my head around using two mosfets to pass AC. I have reduced my schematic to its bare bones to help keep it un-cluttered. The aim of this circuit is to use PWM to dim a bulb ...