You can consider linear regulator based on a power MOSFET, mounted on a reasonable heatsink, and set limits with resistors installed on top and bottom the main potentiometer .. see attached picture ..
To provide basic regulation you can add a 150V Zener diode (can consist of 3 x 47V, or 5 x 33V) and feed potentiometer of it ..
Hi
My input is 220v Ac.
I want use one transformer with 120v(AC) output if I take one good dc power.
Hi IanP nice to meet u
Can I use it with 2A at output?
I want to use it with one universal ac motor.
it has 22000 rpm. I want to fix it at 4000 rpm. so I can use one dimmer too. can you give me one dimmer circuit for this ac motor? I think it take lower price and spcae.
by regards
Added after 5 minutes:
I use this dimmer for my motor and it works but after 3 minute the output voltage increase automatically!!
I simulate your circuit with proteus and it work. but when I put 100 ohm resistor at output ,so it goes down to 0 volt and didnt change.
what can I do?
What is the value of R2?
Keep in mind that circuit build around Q2 - R2 limits the output current, and any load current that produces more than 0.7V across R2 will "turn off" the MOSFET ..
sir, can you let us see your power supply design schematic? it will be a great help for my thesis..
i am similar to the previous guy..
it will really be nice if we will be able to see your design.
thank you