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DIY Stompboxes => Building your own stompbox => Topic started by: sir_modulus on June 06, 2004, 09:21:40 AM

Title: OT: Using wallwarts as power transformers, and dropping vo..
Post by: sir_modulus on June 06, 2004, 09:21:40 AM
Anyone know a way to get 200VAC or around there WITHOUT a Tube power transformer. Like I mean with two wallwarts or something? If I have 300VAC, is it possible to drop it to 200VAC? I would really really thank someone who could help me out.

Thanks,
Title: Same boat sort of..
Post by: petemoore on June 06, 2004, 10:06:59 AM
Try a google search for 'voltage dividers'...
 I'm going the other way, searching for a voltage multiplier.
Title: OT: Using wallwarts as power transformers, and dropping vo..
Post by: R.G. on June 06, 2004, 12:23:05 PM
Sigh.

Yes. From my post a few days ago - it's hard to beat two low voltage transformers back to back. Ideally, make the secondary voltage of both transformers be the filament voltage of the tube. Hook up the transformers as P:S=>S:P where P is the primary 120Vac winding and S is the secondary winding; using 12Vac works well with 12AX7's. Full wave rectify the output primary to about 170Vdc. You can double it to about 300Vdc if you like.
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