I have a question where can I get a 2:1 transformer for my TC 4428 mosfet g= ate driver? Urgently in need any 2:1 will do but more than 12 V ? Please le= t me know .. lambs become Lions -----Original Message----- From: Kerry Wentworth Sender: piclist-bounces@mit.edu Date: Mon, 05 Sep 2011 10:21:34=20 To: Microcontroller discussion list - Public. Reply-To: "Microcontroller discussion list - Public." Subject: Re: [EE] Isolation transformer 60C doesn't seem out of line, and should not damage your transformers. =20 But an isolation transformer on your scope serves no useful purpose. =20 Any modern scope will have a transformer inside already. Line and=20 neutral will be connected only to the primary of the transformer (and=20 on/off switch). Bypassing the safety ground (3rd prong) does exactly=20 the same thing as using an isolation transformer. The problem is, this=20 lets the exposed metal parts of the scope (such as BNC connectors)=20 assume whatever voltage the probe ground clips are attached to. VERY=20 dangerous. FAR safer would be to run the circuitry under test from the isolation=20 transformer. Kerry Electron wrote: > Hello, > is it normal that an isolation transformer gets very hot (~60C) even with= out > a load? > > I have built one using two spare 160VA transformers: 230V->32V =3D 32V->2= 30V of > course the two transformers are identical, just wired as pri->sec=3Dsec->= pri > > I needed it since my oscilloscope is not isolated from ground, and this m= akes > some measuring impossibile without the isolation transformer. > > Meanwhile I noticed that my 'scope is CAT II, i.e. designed to work on ci= rcuits > directly connected to the low-voltage installation (MAINS). > > Could there be any problems about floating the ground connection on mains > powered scopes? I have been using it this way for days but I haven't died > yet, was it just out of luck? :D However I get much more "usefulness" fro= m > my scope through the isolation transformer and no ground. :P > > But then I thought: did I really need the isolation transformer? Couldn't > I just cut the 'scope's ground wire instead?? :P > > With kind regards, > Mario > > =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .