Hi everyone, I just built my first PWM controller circuit with a 555 timer and it worked ! I connected a mosfet and filtred the signal with a cap. Now my question is what isbthe resolution of this circuit ? And does it make a voltage drop with high current loads ? Does it even work with high currents like 10 amps ?

 

Hi Mohamed,

Congratulations! It is fulfilling when a circuit works as expected . Can you post a schematic and part number of the MOSFET? It will be easier to answer your questions with that information.

Thanks

 

It's the same exactly but I just didn't put a resistor to the gate and added a cap for filtering noise

 

In principle a PWM controller is capable of Much higher than 10 amps, if needed.
What do you mean 'Filtered the signal with a cap'?
With a typical inductive load, the voltage represents a square wave, but the current usually consists of a saw tooth, the mean level of which depends on the load.
Max.

 

Also, in any electronic circuit, you can use the output of one stage to switch power to another stage with components rated for higher power.

 

I meant I added a regular filter (resistor + capacitor )

 

I can't see your circuit. Did you try posting it here using the 'Upload a file' button below the Reply box?

 

http://i61.tinypic.com/2r24y1s.jpg
Go to this

 

I don't see any series resistor for the LED?
Also if using on 6v I would have used a Logic Mosfet.
If just switching a LED a 2n7000 would do it.
Max.

 

And does it make a voltage drop with high current loads ?

Yes. The IRF540 will drop about 0.8V when passing 10A.