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Old 21st October 2008, 01:36 PM   #1
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Default Nifty little (cheap ) transformer for bias supply

For 2.99 , hard to go wrong . You could use the 72 or 15 volt winding for a bias supply ,or just wind your own secondary for an oddball filament . Mods feel free to move as you see fit
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Old 21st October 2008, 03:00 PM   #2
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another cheap method is to use a 12vac radio shack bell transformer wired backwards - hook the secondary up to a filament winding on your main power transformer. Use the primary side to get ~55-60VAC.

I've seen this method done to get a bias supply for a power amplifier that was being converted from 'self' to 'fixed' bias.
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Old 22nd October 2008, 12:28 AM   #3
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Looks like the ones used in ancient Jerrold TV top cable boxes.

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Old 22nd October 2008, 12:42 AM   #4
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Default Probably , but...

If it was for a cable box ,what did they use the 72 volt winding for?
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