Hi everyone I'm wanting to build a high current power supply for my DC-ATX unit. I got this schematic which seems fairly easy to build, however, it was listed to work with 12V and did not mention if it will work with any higher voltage.
Can I simply swap the 7812 with 7824/7822 to get 19V-20V output? Do I need to change any resistors value for 19V-20V output and to get the protection mechanism to work? Or will it just refuse to work with this voltage?
High current 12V 30A,25A,20A,15A ham radio power supply | Eleccircuit.com
Can I simply swap the 7812 with 7824/7822 to get 19V-20V output? Do I need to change any resistors value for 19V-20V output and to get the protection mechanism to work? Or will it just refuse to work with this voltage?
High current 12V 30A,25A,20A,15A ham radio power supply | Eleccircuit.com
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With only 15V from the transformer, the most you'll get at C1 is about 21V under load. Once you account for the ripple voltage on C1, it will be tough to get a good quality 19V at the output.
Thanks Francis I understand and I will build the rectified DC section with 60EPU02 rectify diodes and 18V AC transformer if I could simply swap the 7815 with 7822/7824
If you use the higher voltage transformer it will probably work as you want. The protection SCR gets its trigger from the voltage across an emitter resistor, so it shouldn't be affected by the higher output voltage.
Thanks Francis guess I will try to build a test unit first with 7824 and 5A config. Hopefully I can get it to work.
Put the right size zener on the ground leg of the 3 pin vreg, or use an adjustable 3 pin regulator.
If you look around you'll find app notes or other examples of this that you can follow.
If you look around you'll find app notes or other examples of this that you can follow.
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