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Bengali 13th August 2012 05:21 PM

Aleph P1.7 Power Supply mod

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.


Zen Mod 13th August 2012 05:41 PM

zenner voltage + Ugs

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

if you cool it properly :devily:

Bengali 14th August 2012 03:16 AM

Ugs? Please clarify for me simple mind :scratch:

Good to know it does not need a load, Thanks.

flg 14th August 2012 11:37 AM

Vgs = Ugs ;)

Bengali 15th August 2012 04:22 PM

should I change the 2.21K to a 5K so I can adjust the voltage?

Zen Mod 15th August 2012 05:18 PM

put schm here , so we can be sure about what we are talking

Bengali 15th August 2012 07:28 PM

1 Attachment(s)
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.


Zen Mod 15th August 2012 07:35 PM

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

Bengali 16th August 2012 05:00 AM

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...

btw, I miss Pipi Longstocking shows. I grew up watching those adventures. My wife hates her, says she teaches children to be rebellious. I never saw it that way, just was a lot of fun to watch because she was kick *** strong :D

moe29 16th August 2012 10:58 PM

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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