Attachment 45005Attachment 45004https://youtu.be/HARNp0Ykn_8
Printable View
looks like the 555 is running as a Pulse width modulator and using the MOSFET for current capacity. This is a nice tidy package for space constrained control boards - my taig lathe uses a commercial version of this circuit (24VDC electric scooter speed controller) and due to the MOSFETs in that it can handle 300W but is considerably bigger and needs some form of cooling to survive.
these circuits are great to have, and I'm hoping to get good enough at electronics to build a similar one for 380VDC input - I think there i have to use triacs though instead of MOSFETs.
The schematic is shown in the video, but I took a snapshot and is shown below:
Attachment 45006
What's with the weird red and blue coils of wire that don't connect to anything?
You can use MOSFETs at 380 volts, no problem, just depends on how much current you need.
Vishay SIHA6N80AE-GE3 is a 600-volt 5-Amp part for $1.21 at Digi-Key.
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perhaps this will help you.
Attachment 45019
You can use an high voltage mosfet but you need to supply IC555 with fixed voltage up to 18V.
These spiral wires are to get attention, and they have no duties.
