Aikido Power Supply

dmk · 20th August 2007, 10:26 AM

Hi all,

I have picked up two second hand potted 240V / 120V transformers. Will it be ok to parallel primary's and series the secondary's to give me 240v AC B+ Supply Voltage?
Any major issues with using the two on top of my pre-amp chassis? I have not had a lot of luck finding a suitable single tranny in Oz (reasonably priced that is).

Cheers
Dave

Poindexter · 21st August 2007, 01:15 AM

Just use a full-wave voltage doubler on a single tranny to get your 240V out.

No sense reinventing the wheel.

Aloha,

Poinz

beau2317 · 21st August 2007, 03:47 AM

You can also use a simple 1:1 isolating transformer. Usually these are not too hard to come by and quite cheap.

Poindexter · 21st August 2007, 03:54 AM

Beau,

He already has the transformers. I interpreted his question as asking if he could get the voltage he needs out of the transformer(s) he has.

Transformers are expensive.

Aloha,

Poinz

dmk · 21st August 2007, 07:25 AM

Hi Poindexter,

Thanks for the reply. I was not aware I could get double the voltage in this way. I will have a look at it in PSUD. Would your circuit as shown provide an adequate Filter for the Akido ?

Another option I thought of was to wire it up in reverse, so I get 480VAC and filter down with LC's until I get desired 300VDC? I have plenty of Caps but would have to source the chokes.

Cheers
Dave

dmk · 21st August 2007, 10:11 AM

Hi again

After reading another thread, I could piggy back the two TX's - 240 - 120 - 120 - 240.
Are there any advantages to this? Would this filter some noise from mains?

Cheers
Dave

Poindexter · 21st August 2007, 06:55 PM

dmk,

No that's just the rectification and first stage of the filter. A good two-stage might be something like this.

You could get more elaborate (I use a three-stage with an additional RC section), but I recall the Aikido circuit as having a hum cancellation subcircuit on the output.

Poinz

dmk · 22nd August 2007, 11:05 AM

Thanks for the replies Poinz.

If there is nothing to be gained by using the two Tx's and a full Bridge rectifier, I will use one Tx and a voltage doubler.

Thanks for the schematic, I will put it into PSUD and have a look.

Cheers
Dave

Sheldon · 22nd August 2007, 04:16 PM

You won't be able to plug the voltage doubler into PSUD, as it has no provision for anything but the standard connections. But you can probably come close by using entering twice the measured voltage and resistance of the secondary, and half of the combined capacitance of your series C. Everything after the first C is done the normal way.

Sheldon

Poindexter · 22nd August 2007, 05:48 PM

PSUD has the full-wave voltage doubler in its library of rectifier circuits; I use it all the time.

Aloha,

Poinz

20th August 2007, 10:26 AM	#1
dmk diyAudio Member Join Date: Jul 2004 Location: gold coast	Aikido Power Supply Hi all, I have picked up two second hand potted 240V / 120V transformers. Will it be ok to parallel primary's and series the secondary's to give me 240v AC B+ Supply Voltage? Any major issues with using the two on top of my pre-amp chassis? I have not had a lot of luck finding a suitable single tranny in Oz (reasonably priced that is). Cheers Dave

21st August 2007, 03:47 AM	#3
beau2317 diyAudio Member Join Date: Jul 2005 Location: Pukekohe, New Zealand	You can also use a simple 1:1 isolating transformer. Usually these are not too hard to come by and quite cheap. __________________ Moskido (Hybrid Aikido/Mosfet); Verumecce (biased interconnects). Buffalo III with Unbalancer tube output; Magnepan 3.6R

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21st August 2007, 01:15 AM	#2
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	Just use a full-wave voltage doubler on a single tranny to get your 240V out. No sense reinventing the wheel. Aloha, Poinz

21st August 2007, 03:54 AM	#4
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	Beau, He already has the transformers. I interpreted his question as asking if he could get the voltage he needs out of the transformer(s) he has. Transformers are expensive. Aloha, Poinz

21st August 2007, 07:25 AM	#5
dmk diyAudio Member Join Date: Jul 2004 Location: gold coast	Hi Poindexter, Thanks for the reply. I was not aware I could get double the voltage in this way. I will have a look at it in PSUD. Would your circuit as shown provide an adequate Filter for the Akido ? Another option I thought of was to wire it up in reverse, so I get 480VAC and filter down with LC's until I get desired 300VDC? I have plenty of Caps but would have to source the chokes. Cheers Dave

21st August 2007, 10:11 AM	#6
dmk diyAudio Member Join Date: Jul 2004 Location: gold coast	Hi again After reading another thread, I could piggy back the two TX's - 240 - 120 - 120 - 240. Are there any advantages to this? Would this filter some noise from mains? Cheers Dave

21st August 2007, 06:55 PM	#7
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	dmk, No that's just the rectification and first stage of the filter. A good two-stage might be something like this. You could get more elaborate (I use a three-stage with an additional RC section), but I recall the Aikido circuit as having a hum cancellation subcircuit on the output. Poinz

22nd August 2007, 11:05 AM	#8
dmk diyAudio Member Join Date: Jul 2004 Location: gold coast	Thanks for the replies Poinz. If there is nothing to be gained by using the two Tx's and a full Bridge rectifier, I will use one Tx and a voltage doubler. Thanks for the schematic, I will put it into PSUD and have a look. Cheers Dave

22nd August 2007, 04:16 PM	#9
Sheldon diyAudio Member Join Date: Dec 2003 Location: San Diego	You won't be able to plug the voltage doubler into PSUD, as it has no provision for anything but the standard connections. But you can probably come close by using entering twice the measured voltage and resistance of the secondary, and half of the combined capacitance of your series C. Everything after the first C is done the normal way. Sheldon

22nd August 2007, 05:48 PM	#10
Poindexter diyAudio Member Join Date: Oct 2004 Location: Maui, Hawai'i, USA	PSUD has the full-wave voltage doubler in its library of rectifier circuits; I use it all the time. Aloha, Poinz

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