In Reply to: Thoughts on doubler supply straight out of wall no transformer 450V caps.??? posted by -3db on September 16, 2002 at 00:55:06:
Ok, before they shoot me.Get Two 12v Halogen desklights - cheap (they can be bought for around £5. so you should be able to get them for less).
Dismantle them - they will contain a 12V transformer each...
Now connect one 12V output to one 12V input. You've just made an isolation transformer with about 6dB greater isolation than a true isolation transformer. Then, use the EL84 filaments wired in series (requiring.. you guessed it 12V or so), and using a 12AX7 or suchlike with its series centre tap.. Low and behold, 1 HT supply, and filaments heated too.
Have fun
Owen
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