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Registered Member #2648
Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
Hello
Does anyone here know where I can get an isolation transformer for under $40 (inc. P/H) but more preferably under $20? I got 50 X1 caps and 50 diodes to make a CW multiplier but isolation transformers look a bit expensive =S. Should I make my own isolation transformer? or maybe not use one...maybe?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
You could use two standard transformers back-to-back, e.g. 240:12 connect to 12:240 the available output power will be a little less than the lower power transformer. You don't need much power so 10 to 50 VA is adequate.
OR
you can run directly off the line/mains, initially use a 240 Vac lamp in series with the input for testing. You can run directly from the main supply because; Neutral is near to earth/ground potential You are not going to be in contact with the output You have a high value resistor from the output to protect the diodes during discharge. I did this with 30 10nF ceramic disk caps and 30 1N4007 diodes, works ok.
Registered Member #1533
Joined: Wed Jun 11 2008, 02:13PM
Location: ReykjavÃk, Iceland
Posts: 46
Now, I haven't tried this, but how about rewinding a MOT? That is, remove the shunts and the secondary and replace the secondary with an equal amount of turns to the primary. Have you guys tried that and if so how much power were you able to pull through before going into saturation?
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Isolation Transformer
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