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In Reply to: RE: Well all the parts finally got here...... posted by vinnie2 on December 02, 2016 at 15:14:05
The performance of the last two lighting transformers I purchased was very disappointing. Like yours, the voltage was higher than anticipated, and the wave shape not very square. My next ultrasonic heating project will be based on tapping off the square wave from a standard, adjustable DC switcher. Then I'll filter it to approximate a sine wave. That will hopefully resolve both these issues.
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Buy Chinese. Bury freedom.
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Well, if it works out I hope you will share it with us as this whole filaments voltage thing is making me crazy! It more trouble than all the rest of the wortk combined. Curse you 10 volt filaments, curse you!
Well, the transformers you bought can be used. As we discussed, you'll need to A) add a capacitor (at least 47uF) to smooth the 160VDC power at the output of the rectifiers, B) replace the fusible resistor at the input with a 2-5 ohm, 3W standard resistor, C) unwind all but one turn on the oscillator transformer (increases the frequency, may not apply to yours), and D) use a small value resistor in each side of the output to drop voltage to the proper value for your 5A filament. We know this can work, so don't give up. :)
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Buy Chinese. Bury freedom.
Why not just unwrap one of the windings on toroidal, one or two shouldn't hurt anything.
I was able to drop it down to 4.5 volts before the transformer gave out(saturated?)
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