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-   -   Aleph P1.7 Power Supply mod (http://www.diyaudio.com/forums/pass-labs/217867-aleph-p1-7-power-supply-mod.html)

 Bengali 13th August 2012 06:21 PM

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

 Zen Mod 13th August 2012 06:41 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 04:16 AM

Ugs? Please clarify for me simple mind :scratch:

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

 flg 14th August 2012 12:37 PM

Vgs = Ugs ;)

 Bengali 15th August 2012 05:22 PM

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

 Zen Mod 15th August 2012 06:18 PM

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

 Bengali 15th August 2012 08:28 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.

thanks

 Zen Mod 15th August 2012 08:35 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 06:00 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 11:58 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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