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Old 2nd April 2009, 08:54 AM   #1
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Default Stacking power supplies

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.
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Old 2nd April 2009, 09:10 AM   #2
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Here's a voltage comparison:
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Old 2nd April 2009, 08:24 PM   #3
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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.
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Old 2nd April 2009, 09:23 PM   #4
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Did you look at the graph?
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Old 2nd April 2009, 09:25 PM   #5
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Yes, can you explain it to me!
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Old 2nd April 2009, 09:37 PM   #6
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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.
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Old 2nd April 2009, 09:38 PM   #7
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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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Old 2nd April 2009, 09:44 PM   #8
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Quote:
Originally posted by KevinHeem
Is what you created a capacitance multiplier-multiplier.

Hahahaaa....

I think you're right...
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Old 2nd April 2009, 09:48 PM   #9
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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.
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Old 2nd April 2009, 09:52 PM   #10
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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?
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