/diy/ - Do It Yourself

>>818778
>>818778
I did this:
https://www.youtube.com/watch?v=a2ViLjXX1zg
It becomes a pretty useful prototyping aid with the LCD+keypad shield. I can write menus with different functions to test many things at once with more or less precision.
I made a neat 555 driver shortly afterwards.
I also used it to program a bunch of this >>818781, I can't think of a better programmable chip when it comes to small circuits.

>>809588
You can change R2 for a pot. 12V are no harm to it, you aren't even driving inductive elements that can generate kickbacks.
I recommend you an IRFP250 mosfet, that's the one I used for my flyback driver, I even got to run it with 42 volts 3-4 amps (around 150W) isolating the 555 with a 7812.
For lower powers (130W max) I use the IRF540N, the bad thing about this one is it's a TO-220 and its more difficult to heatsink.

150W Flyback driver, although I'm looking for a transistor that performs as good as the irfp250 mosfet to replace it since I have doubts about if it's still working properly.

Question: Does something happen if you connect the output of the 7812 regulator to 12 volts and the ground pin without connecting the input to anything?