Electronics Forum | Wed Feb 07 08:41:10 EST 2001 | dliechti
I have to design a power supply which converts 220V AC into 5V smothed DC. It has to be very small, so it shouldn't have a big transformer. Has somebody a scheme of a circuit? Thanks
Electronics Forum | Wed Apr 30 07:03:07 EDT 2008 | gemengr
DEK_265LT had been turn off and on by itsefl couple of time yesterday,and then off for good. I check the power going in to machine to the switch,got power to it,then power out to that little green box but there wasn't any power out put from that lit
Electronics Forum | Mon Aug 06 05:12:20 EDT 2007 | wayne_
Hi Is there any standard or requirement to test the solder under high power operation? For example, a power switching device, what is the failure mode of the solder joint after the whole equipment undergone a high power (current / voltage) environmen
Electronics Forum | Wed Nov 01 23:59:23 EDT 2017 | lkdhde1
F5HM power supply unit 00375503-02,consion document which I have is not suitable since this is new power supply unit, want to find out suitable document
Electronics Forum | Wed Apr 30 07:45:05 EDT 2008 | gemengr
Yes, it is. there's a heat sensor under of 4 resister,look like it open now.I'm thinking to make a jumper right there to see it can power up the machine.(this's a little green box on top of the transformer)
Electronics Forum | Wed Apr 30 07:50:34 EDT 2008 | realchunks
I've done it in the past. By-pass it and you'll be back in production. Make sure your power is off.
Electronics Forum | Wed Apr 30 11:41:55 EDT 2008 | gemengr
It back running now, after shut it off over night, it power back up,look like the heat sensor under of 4 resistors is start getting bad.But i'll by pass it, if it happen again. Thank you for your in put.
Electronics Forum | Wed Apr 05 22:31:51 EDT 2000 | Dave F
Robert: Out of curiosity, by "BT" do you mean: � Bismaleimide triazine, the stuff used to increase the tg of resins used in some BGA interposers. � British Telecommunications plc, the guys with bad teeth. � BrookTree, the RAMDAC supplier, that�s par
Electronics Forum | Mon Aug 19 15:21:17 EDT 2013 | marcelorotofrance
Hi Rollon, thanks for your answer. At this point it seems that cold-start current surge, because the presence of large value capacitors in the power source, exceeds the sensitivity of the protection switches rather than a malfunction. Nevertheless, i
Electronics Forum | Mon Aug 06 10:05:23 EDT 2007 | davef
IPC-A-610 has a section on high voltage soldering
