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Old 15th February 2001, 05:27 PM   #1
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I'm not going to buy a new transformer for my Bride of Zen.
I have a 30V Transformer laying around.

So, 30V * sqrt(2) is 42V after the Bridge.

If I stack 4 10V zeners instead of 6 is that all I need to do? It looks that way to me.

I should get a clean 40V out of it.

Can anyone see any other parts that will need to change? Possibly increase the power rating on the pull up resistor? I wouldn't think so.

Thanks,
pixie
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Old 15th February 2001, 06:01 PM   #2
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Cool Bride of Zen Trans

The project calls for 30+30 trans at.5 amps.
The Avel equivalent is the D4007, which is a 30v-0-30v @ 0.5 amps.

The trans is connected in series.

The power supply is suppose to produce 86v and is regulated to 60v by the zeners.

If you have a 30 + 30 with more current capability, that's even better. I originally had a 6 amp 30+30 trans. in my BOZ and it sounded so awesome. I have what the article calls for now and it's not as warm and detailed as it was with the larger trans. I'm poppin' that puppy back in when I get the chance.

Good Luck!!

Vince
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Old 15th February 2001, 06:52 PM   #3
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Default Amps.

I have amps to spare on this 15+15. It's 7.5A.

That's not the problem. The problem is, I don't want to spend another $60 on a 30+30 even at 1A.

So, given that I'm not going to get a larger transformer, what do I need to do to use mine?

Thanks,
pixie
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Old 15th February 2001, 07:55 PM   #4
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Pixie,

I don´t know the circuit, but it seems you need a +/- 30V dc regulated power supply using an 15+15V transformer, right?

The transformer you said you had is big, but it appears doesn´t be a big problem for you.

Considering this, you can use diode voltage doubler circuits on both sides of the transformer´s secondary winding to achieve +/- 43V or more at the input of the regulator circuit.

It´s easy and any basic electronic handbook has the information you need to do this.

Be carefull about ripple and decoupling. Use the best filtering capacities as possible.

Regards

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Old 15th February 2001, 08:31 PM   #5
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Lightbulb Supply Doubler.

Pix,

You can see how this is done in a Booklet from Radio Shack that costs about $3-$4. They have them in all their stores.
It's called Engineer's Mini-Handbook, Basic Semi-Conductor Circuits, by Forest M. Mims III. #276-5013a. There is a series of them. I have a few and come in handy from time to time.

You'll probably need a few diodes and caps, but that's about it. You may need to baypass the rectifier circuit on the board, but I'm not sure. Study the circuit and see what you need to do.

If you are in a rush, I can try to draw it up and I'll email it to you. Get back soon, because I won't be near a computer all weekend!

Late!

Vince
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Old 15th February 2001, 09:00 PM   #6
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Default Doubler

http://www.kwarc.org/bulletin/99-04/tech_corner.htm

This is a circuit for a full-wave voltage doubler (or so).

So, this could work. I will need a couple more diodes and caps.

Would you use this? Is the Radio Shack one different? I probably have it laying around too. I'll have to dig deep to find it though.

Later,
pixie
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Old 15th February 2001, 10:48 PM   #7
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Exclamation Doubler

I don't think it's the same. You might want to dig up the RS booklet. The one in the RS book has 2 caps across the rectifier's output.

If you email me tonight, I'll draw it up and email it to you tomorrow.


Vince

vincenet3@juno.com

[Edited by vdi_nenna on 02-15-2001 at 04:53 PM]
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Old 15th February 2001, 11:54 PM   #8
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The use a voltage doubler in the A40 amp in the passlabs site. Why don´t you read that. I think it has all the info.
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Old 16th February 2001, 09:52 AM   #9
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I`ve just simulated the circuit from http://www.kwarc...., and the U-output is : [U(tr)pp - (2xU(diode))], meaning if you have a transformer with 15V peak/30V pp you`ll get @28V out.
If the capacitors are 10.000uF, the diodes, with their anode to gnd, will have to handle @22Amp at start-up.
Good luck.
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Hoffmeyer ;0)
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Old 16th February 2001, 10:18 AM   #10
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Default Simulation program

Hoffmeyer:

What program do you use to simulate the circuits?

-Kaj
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