Voltage doubler, tripler or other creative solution?

markusA · 28th March 2010, 12:10 PM

My project is slowly coming togeather.
It's a modular DAC build.
DAC -> LDR attenuator -> Circlotron tube buffer

I'll be needing 7-15VAC, 22-24VDC, 6.3V and (2x) +/- 200VDC.
The (2x) AN-1T150 will be enough to give me the +/- 200VDC in a floating psu.
The other secondaries will give med some 6.3V which will take care of the heaters.
All in all I'll have 3x6.3VAC left after powering the buffer.

Do you have any creative solutions for attaining 7-15VAC and 22-24VDC?

Perhaps I could connect two 6.3V secondaries in series for 12.6VAC?
Maybe build a voltage tripler for 26,5VDC and then regulate it to 22-24V?

What do you think?

Transformers need to be shielded, take up a lot of space and are costly. I'm looking for alternatives to adding more trafos?

Minion · 28th March 2010, 06:11 PM

Well 12.6vAC will give you close to 17vDC , so with a Doubler you can get over 30vdc that can be regulated to 24v DC , Remember you need to use a lot more capacitance for filtering in a Voltage doubler supply , over double the capacitance ......

Cheers

markusA · 28th March 2010, 06:18 PM

Actually I see I made a small typo.
I think it should be quadrupler not tripler.

Minion> I need both 7-15VAC and 22-24VDC.

Playing around with numbers I thank heaven for the low voltage application. 25V caps are fairly cheap even if they are large. (10000uF)

Minion · 28th March 2010, 07:11 PM

You said you could make 12.6v AC right ?? Isn"t that between 7-15v AC ?? You can use the same 12.6vAC supply for the 7-15v AC and the 24vDC with the Voltage doubler .....

markusA · 28th March 2010, 07:30 PM

Hmm, I never thought of that. I kind of assumed every psu should have it's own secondary on the trafo.

Following the same logic one could connect the 3 6.3V secondaries in series and get 18.9VAC, rectify it and have roughly 26.5V?

Minion · 28th March 2010, 07:41 PM

Hi, I don"t see why not , I have used a single winding to get several voltages before , have even used the 12.6v AC heater tap through a Voltage Tripler to power the Plate of a Tube (starved plate) and the heaters , have used the Unregulated Power for a Poweramp and regulated it down for the Opamps .... as long as there is enough current to power all circuits and there are no ground loops there shouldn"t be a problem ....

Cheers

markusA · 28th March 2010, 07:49 PM

The current capability is a non issue, each 6.3V secondary is good for 3A.

28th March 2010, 12:10 PM	#1
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	Voltage doubler, tripler or other creative solution? My project is slowly coming togeather. It's a modular DAC build. DAC -> LDR attenuator -> Circlotron tube buffer I'll be needing 7-15VAC, 22-24VDC, 6.3V and (2x) +/- 200VDC. The (2x) AN-1T150 will be enough to give me the +/- 200VDC in a floating psu. The other secondaries will give med some 6.3V which will take care of the heaters. All in all I'll have 3x6.3VAC left after powering the buffer. Do you have any creative solutions for attaining 7-15VAC and 22-24VDC? Perhaps I could connect two 6.3V secondaries in series for 12.6VAC? Maybe build a voltage tripler for 26,5VDC and then regulate it to 22-24V? What do you think? Transformers need to be shielded, take up a lot of space and are costly. I'm looking for alternatives to adding more trafos?

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28th March 2010, 06:11 PM	#2
Minion diyAudio Member Join Date: May 2006	Well 12.6vAC will give you close to 17vDC , so with a Doubler you can get over 30vdc that can be regulated to 24v DC , Remember you need to use a lot more capacitance for filtering in a Voltage doubler supply , over double the capacitance ...... Cheers

28th March 2010, 06:18 PM	#3
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	Actually I see I made a small typo. I think it should be quadrupler not tripler. Minion> I need both 7-15VAC and 22-24VDC. Playing around with numbers I thank heaven for the low voltage application. 25V caps are fairly cheap even if they are large. (10000uF)

28th March 2010, 07:11 PM	#4
Minion diyAudio Member Join Date: May 2006	You said you could make 12.6v AC right ?? Isn"t that between 7-15v AC ?? You can use the same 12.6vAC supply for the 7-15v AC and the 24vDC with the Voltage doubler .....

28th March 2010, 07:30 PM	#5
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	Hmm, I never thought of that. I kind of assumed every psu should have it's own secondary on the trafo. Following the same logic one could connect the 3 6.3V secondaries in series and get 18.9VAC, rectify it and have roughly 26.5V?

28th March 2010, 07:41 PM	#6
Minion diyAudio Member Join Date: May 2006	Hi, I don"t see why not , I have used a single winding to get several voltages before , have even used the 12.6v AC heater tap through a Voltage Tripler to power the Plate of a Tube (starved plate) and the heaters , have used the Unregulated Power for a Poweramp and regulated it down for the Opamps .... as long as there is enough current to power all circuits and there are no ground loops there shouldn"t be a problem .... Cheers

28th March 2010, 07:49 PM	#7
markusA diyAudio Member Join Date: Dec 2009 Blog Entries: 8	The current capability is a non issue, each 6.3V secondary is good for 3A.

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