Stacking power supplies

carpenter · 2nd April 2009, 08:54 AM

In Zen version 3, Nelson details a power supply. My question is this: can two positive voltage power supplies, such as described in the Zen article, be stacked, piggy-back?

I'm submitting a schematic that I simulated. According to Simetrix, the voltage is smoothed considerably with the second stage.

I'm seeking this particular method because I wish to use higher voltage (125v) on my mid-stage mosfets. I'm not very comfortable operating a chip voltage regulator at this extreme.

carpenter · 2nd April 2009, 09:10 AM

Here's a voltage comparison:

KevinHeem · 2nd April 2009, 08:24 PM

I don't think you need to(add a second stage)...try adding zener diodes or increasing the values to get your required voltage. Then try increasing and decreasing the values of C5 and C6.

carpenter · 2nd April 2009, 09:23 PM

Did you look at the graph?

KevinHeem · 2nd April 2009, 09:25 PM

Yes, can you explain it to me!

woody · 2nd April 2009, 09:37 PM

Because the input impedience of the pass mosfet is so darn high
there might be less noise if you replaced the R34 resistor with
a ccs and replaced the zener stack with a resistor. No zener =
no zener noise.

KevinHeem · 2nd April 2009, 09:38 PM

From my understanding of the circuit (limited) it is a capacitance multiplier, with the zener diodes holding the voltage constant. Is what you created a capacitance multiplier-multiplier.

carpenter · 2nd April 2009, 09:44 PM

Quote:

Originally posted by KevinHeem
Is what you created a capacitance multiplier-multiplier.

Hahahaaa....

I think you're right...

carpenter · 2nd April 2009, 09:48 PM

Quote:

Originally posted by KevinHeem
Yes, can you explain it to me!

The first stage has voltage variations of 0.120 volts, while the second stage only has variations of 0.005 volts.

carpenter · 2nd April 2009, 09:52 PM

Quote:

Originally posted by woody
Because the input impedience of the pass mosfet is so darn high
there might be less noise if you replaced the R34 resistor with
a ccs and replaced the zener stack with a resistor. No zener =
no zener noise.

The zener stack is what holds the voltage constant. Get rid of the zener stack and the voltage varies, yes?

2nd April 2009, 09:23 PM	#4
carpenter Paper mache horn fabricator diyAudio Member Join Date: Mar 2002 Location: Oregon City, Oregon	Did you look at the graph? __________________ I enjoy audio so much that I constructed a web site. I share my ideas at: www.inlowsound.com

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2nd April 2009, 08:24 PM	#3
KevinHeem diyAudio Member Join Date: Nov 2007	I don't think you need to(add a second stage)...try adding zener diodes or increasing the values to get your required voltage. Then try increasing and decreasing the values of C5 and C6.

2nd April 2009, 09:25 PM	#5
KevinHeem diyAudio Member Join Date: Nov 2007	Yes, can you explain it to me!

2nd April 2009, 09:37 PM	#6
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	Because the input impedience of the pass mosfet is so darn high there might be less noise if you replaced the R34 resistor with a ccs and replaced the zener stack with a resistor. No zener = no zener noise.

2nd April 2009, 09:38 PM	#7
KevinHeem diyAudio Member Join Date: Nov 2007	From my understanding of the circuit (limited) it is a capacitance multiplier, with the zener diodes holding the voltage constant. Is what you created a capacitance multiplier-multiplier.

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