| Electronics > Projects, Designs, and Technical Stuff |
| chinese psu kit |
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| m3vuv:
i think everyone is missing the point,ive no interest in buying anything,the kit is built and works fine,i just wanted to know if my ideas to get a few more amps from it would work,if i wanted a basic psu id use a 723 etc,ive built a homebrew cnc mill and turning it into a laser engraver,if i can get 5 amps out of the psu it would be handy for powering the lased diode,approx 4 amp.,i dont need lectures on heatsinks etc,ive been into electronics for 40+ yrs keep the advice for the newbies!,dont mean to sound rude but i ask a simple question and it doesent get answered just waste my time reading posts that are not realy helpfull in regards to my original question. |
| m3vuv:
maybe even swiching taps on a transformer to reduce the power dissipated in the pass elements,its more the cc mode im after,i could use a 723 but the current foldback doesent start until .6v is across the current sense resistor,with this kit half of the current control is already there and better than the 723 can do overall,look upon it as more of a hack. |
| Simon:
Well it sounds like you don't want advice so why are you asking? |
| Simon:
The transformer is 24V for a 30V output, erm yea, this sounds like the regulator as it stands can hardly cope as they are relying on the peak voltage to be over 30V but if you pull enough current it will loose regulation. Theoretically increasing the transistors will work and yes sorry to give the advice you don't want but heatsinking will need to be looked at again. yes if you drop the sense resistor value it will work to 5A thinking it's 3A. Without seing the schematic I have no idea. Wy don't you just buy a cheap switchmode unit that is already on a frame and ready to use? |
| Ysjoelfir:
--- Quote from: Simon on April 30, 2019, 06:36:16 am ---Wy don't you just buy a cheap switchmode unit that is already on a frame and ready to use? --- End quote --- Because he is 40+ years into electronics, so he knows everything that he needs to redesign this shitty PSU to power his laser. Well, obviously nearly everything. How can you not understand that? Some basics in kindness and using the space bar seem to be lacking, though. |
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