- Blog entry posted in 'Teardowns', September 24, 2014.
Title says all, found couple smaller psu's, most are SMPU's and 24v, voltage was main reason i bought 'em, and there was also one good quality with them too. Toroids were just with sale so why not.
88391
Mascot is the better quality one, it seems to reduce inrush current itself, as it takes small delay to turn on, and no inrush current similar to other SMPU's i'we encountered so far. it also is douple isolated (no hard-earth) And very lightweight!. Only thing i don't like in quality are chinese 'lytics...but so far it works fine, no need to replace. its rated 24v/3A so perhaps it's why it doesn't take inrush current too much. PWM controller chip is UC2844, i can take shots with scope later. and other tests too.
88392
Those two other, which have very ventilated cases, are hard-grounded, and take some inrush current.
No controller chip, so perhaps PWM is controlled otherwise. They're pretty universal, as input voltage is 110-230v/50-60hz. Output voltage is 24v/2.1A
88393
Last one is like those toroids, just linear stuff that came along the sale. 'Prolly salvage that one for parts.
88394
i'll also include smaller inverter, 12vdc->230vac 110w (square). Got this one from friend for free. First thing i found strange is that front panel says fuse size 25A, instead 15A is installed. This inverter is also made by Mascot. Input terminals are abiko's and output socket is earthless socket. Controller chip is LM3524. Circuit itself is good looking, transformer doesn't have any useful info on it...
88395 88396 88397
Thanks! more stuff comin' up in next post, probadly would'hve gotten too big as one post, or not, well see...
