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Voltage doubler/quadrupler
Voltage doubler/quadrupler
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Old 8th August 2019, 03:33 PM   #31
kodabmx is offline kodabmx  Canada
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Voltage doubler/quadrupler
That would explain why I only have 450V under load... I'll rejig the caps and see what I can do...
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Old 8th August 2019, 07:16 PM   #32
kodabmx is offline kodabmx  Canada
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Voltage doubler/quadrupler
Ok, so I made one final change. I now have 580V instead of 450V. Nice! When all is said and done though, It's cheaper to use the DC-DC board than buy all the caps, and the choke, but it's a nice solution if you don't want to use SMPS
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Last edited by kodabmx; 8th August 2019 at 07:23 PM.
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Old 8th August 2019, 07:26 PM   #33
Mooly is offline Mooly  United Kingdom
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Voltage doubler/quadrupler
That looks a pretty decent final version to me. Make sure the high value resistors are rated for high voltage use (I'm sure you know all this ) because although the power dissipation is relatively low, it doesn't mean that any 0.5 or 1 watt part will be OK. Resistors have voltage ratings as well as power ratings.
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Old 8th August 2019, 07:35 PM   #34
Mooly is offline Mooly  United Kingdom
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Voltage doubler/quadrupler
Quote:
Originally Posted by TonyTecson View Post
i thought ac had no polarity, i will try that both ways and see...
It doesn't in that sense.

In this circuit the top winding connects via all those 470uf caps to ground which means there is no AC voltage on that top winding when measured with respect to ground.

The lower winding connection is the one with the full AC present (with respect to ground).
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Old 8th August 2019, 07:37 PM   #35
kodabmx is offline kodabmx  Canada
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Yup... Equalizing resistors are 1/2W rated at 350V, R11 and R12 are 5W and rated for 1kV. I've honestly never has an arc across a resistor though, but this is the highest voltage I've needed to use.

This is what it's powering (one for each channel):

Yes, I know, the following 51k grid resistors are too low, but this is a retrofit and I haven't needed to change them yet.
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Last edited by kodabmx; 8th August 2019 at 07:44 PM.
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Old 8th August 2019, 10:46 PM   #36
TonyTecson is offline TonyTecson  Philippines
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C6/C9 is an impedance subject to ohm's laws...

@Mooly, thanks
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Old 8th August 2019, 11:06 PM   #37
stocktrader200 is offline stocktrader200  Canada
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I used a full wave voltage tripler for my 6922's to get 140v DC from 30vac centertap.
I would dump the coil for a 1000v BJT. I used a 2N5551 and the AC ripple is well below the tube johnson noise.
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Old 9th August 2019, 07:55 AM   #38
Elvee is offline Elvee  Belgium
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If you tie the (-) side of C6 to the +320V, you will spare C9, you could halve C6 and still get a ripple reduction.
If you keep C6=47µF, the ripple improvement will be quite significant
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Old 9th August 2019, 09:28 AM   #39
Kay Pirinha is offline Kay Pirinha  Germany
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kodabmx, are you going to drive a pair of large DHT's?
Best regards!
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Old 9th August 2019, 11:03 AM   #40
kodabmx is offline kodabmx  Canada
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Voltage doubler/quadrupler
Quote:
Originally Posted by Kay Pirinha View Post
kodabmx, are you going to drive a pair of large DHT's?
Best regards!
Nope. Just a 12SN7 driver. I posted it above.

Elvee: Good information for the next build (I'm sure this won't be the last time I use this circuit).
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