Aleph P1.7 Power Supply mod - diyAudio
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Old 13th August 2012, 06:21 PM   #1
Bengali is offline Bengali  United States
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Default Aleph P1.7 Power Supply mod

Hi,

to use the Aleph P1.7 power supply with 50V output, I just change the zener diodes voltage drops to = 50V?

How much load current does this circuit need to properly regulate? What value load resistor to insure it's regulating?

Th transformer is 50V 1A.

Thanks
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Old 13th August 2012, 06:41 PM   #2
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zenner voltage + Ugs

regarding load - it's working from 0mA up to max dissipation of series mosfet

if you cool it properly
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Old 14th August 2012, 04:16 AM   #3
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Ugs? Please clarify for me simple mind


Good to know it does not need a load, Thanks.
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Old 14th August 2012, 12:37 PM   #4
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Vgs = Ugs
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Old 15th August 2012, 05:22 PM   #5
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should I change the 2.21K to a 5K so I can adjust the voltage?
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Old 15th August 2012, 06:18 PM   #6
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put schm here , so we can be sure about what we are talking
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Old 15th August 2012, 08:28 PM   #7
Bengali is offline Bengali  United States
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this one...

was planning something like 5.8V Zeners x 9 = 52.2V

but again, not sure about the Vgs voltage as you mentioned, so maybe
better to add trimmer to tweak in for 50V.

thanks
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Old 15th August 2012, 08:35 PM   #8
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leave everything as is , regarding resistor values

you'll have final voltage in range (9x5V8)-Ugs ~ slightly under 50V

Ugs is voltage between gate and source , needed that mosfet is open

so - when you have 52V2 on gate , source will be on lower voltage ....

with resistors you can't set voltage , they aren't here for that
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Old 16th August 2012, 06:00 AM   #9
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for learning purpose, the 2.21K is to limit the current through the zeners and something more? the 4.7K along with the zener string gives the Vgs?
trying to learn a little more besides just soldering it together...

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Old 16th August 2012, 11:58 PM   #10
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Bengali, check out the Balanced Zen Line Stage article.

It's a great teaching guide and that preamp is very similar to the Aleph P.
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