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lab power supply

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glinjik:

--- Quote from: george.b on December 24, 2019, 01:57:25 am ---Something's missing from your MOSFET's drain, no? :P

--- End quote ---

well spotted an error an the ctr/c ctr/v ni miltisim, paint,save as  :palm: mery xmas

glinjik:
happy new year to all

so carrying on with the development of my basic power supply the fan control i added is not as good as i hoped the transforer suffers when the fan kicks in and it is very difficuly to adjust tried different thermistors 2k 5k 10k 15k 47k got a whole bunch from my scrap power supplies so whilst i was hunting i had a look inside some old security cameras and found what i thought were 12v transformers turns out they are 19v with a volt regulator at 12v so i thought hm maybe i can rebuild is into a basic power supply and run the fan from that as A secondry transformer then i came across a fan control board the model is 3bs00383xxgp ver 1 so i installed a 15k thermister attached it to my rebuilt power supply and sems to work really well il do a schematic in tie bt for now some pics of just this part

glinjik:
although this seems ok fan runs very quiet i think i would like it to turn off compleatley so im thinking remove the resistor highlighted in pic and put in a trimmer pot any thougts?

glinjik:
this is what the fan power supply is ased on except i used bridge rectifier instead of 1n4007 1000uf cap is a820uf 200v lm7812 is a kp142ен8б that seems to be a russian equivalent of lm317? and the 1uf cap i stck in a 100uf 100v the small heatsink is enough to keep the volt reg cool it puts out a steady 11.81v the fan is 0.12A

alex-sh:

--- Quote from: EEVblog on December 17, 2019, 11:10:17 am ---
--- Quote from: tooki on December 15, 2019, 12:47:22 pm ---So while it might have always been envisioned in your mind as the uSupply, anyone watching the PSU series from the beginning (as I did) would see it as morphing from a more traditional PSU design into the uSupply. And for sure, for someone looking for how the “lab PSU” series continues, it’s not self-evident from the video titles that the uSupply is the continuation. Looking for “PSU part 14” comes up dry.

--- End quote ---

These prototypes must be a figment of my imagination.
From left to right, dated 7/8/09, 3/5/10, 31/8/10
I showed that first prototype to Leo Simpson at Silicon Chip when he visited Altium in 2009 and dropped by my cubicle to say hi. Almost got it published in SC, but I just kept fiddling with it.

(Attachment Link)

--- End quote ---

So what happened? These never went to production

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