Push-Button LED Light Dimmer Circuit .This post shows you how to vary the Brightness of LED Light using IRF540 MOSFET. Increase and decrease the brightness of the LED light using the two Micro Switch. Only a small amount of components have been used. Is the Low Cost Circuit.
LED Light Dimmer Circuit Diagram :
I designed A circuit Diagram from Easyeda site
Components Required :
- IRF540 MOSFET – 1no
- 1M Resistor – 1 no
- Micro Switch – 2no
- 1uf(105) Capacitor – 1no
- Zero Board – 1no
- 12v LED Light – 1no
Tools Needed :
- Soldering Iron
- PCB holding Stand
- Lead
- Past
- Soldering Iron Stand
Can you please explain how this circuit actually works?
I think it’s because with the first switch Vgs increases and current flows? Please explain the theory.
Please explain the theory.
I think it’s because with the first switch Vgs increases and current flows?
Be careful not to accidentally press 2 buttons at the same time, it will short circuit the power supply. Fixed using 2 resistors as shown in the image from this link.
https://image.opel.in.th/upload/a92b8b0ce8730a3d12f7088d700f81d7.png
aae3039: Great observation! I’ve seen circuits similar to this in many places, and they all suffer that same fatal flaw. It would not be uncommon, for example, on a small hand-held controller, to accidentally push both buttons.
A key problem with all these MOSFET LED dimmer circuits is that they come on by default at full brightness because the capacitor is initially a dead short. I am still unable to figure out a way to guarantee that the circuit powers up with the MOSFET fully off.