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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 14th November 2019, 10:43 AM   #1811
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Quote:
Originally Posted by Harry3 View Post
Why were the "square" LEDs specified?

For 15V can I use 5mm round Red LEDs Vf=
1.94V?
Yes you can use other shapes and makes of reds if they fit.

Those specific brand and type Leds proved more consistent in VF tolerances between samples, that is why specified, not because of shape.
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Old 14th November 2019, 11:29 AM   #1812
Harry3 is offline Harry3  Australia
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Thanks for the confirmation.
I wasn't concerned about the shape, just checking on the spec.
I have heaps of red LEDs that I can match.
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Old 14th November 2019, 12:33 PM   #1813
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Perfect then.
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Old 16th November 2019, 01:59 PM   #1814
kenneth_obee is offline kenneth_obee  Hong Kong
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Default Negative output below -5V

Hi Salas,
I search old post and know that to use MTP3055VL in M2 for Vout less than +5V. How about the negative rail? What do you recommend to swap in M2 when the output is smaller than -5V?
Thanks!
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Old 16th November 2019, 02:16 PM   #1815
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
I don't think there was opposite equivalent type to use. If anybody knows of low gate threshold Logic Level P-MOS will be nice. In case of only such N-MOS available, a trick would be to make two positive regs with those and then use them floating with middle point as "zero" like stacking batteries in series. The lower reg in the stack is then seen as "negative".
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Old 16th November 2019, 03:18 PM   #1816
kenneth_obee is offline kenneth_obee  Hong Kong
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Quote:
Originally Posted by Salas View Post
I don't think there was opposite equivalent type to use. If anybody knows of low gate threshold Logic Level P-MOS will be nice. In case of only such N-MOS available, a trick would be to make two positive regs with those and then use them floating with middle point as "zero" like stacking batteries in series. The lower reg in the stack is then seen as "negative".
Thanks for your prompt reply!
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Old 29th November 2019, 02:54 AM   #1817
yunyun is online now yunyun
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My three boards are + 5V, + 15V, -15V. When I soldered the components on the + 5V board, it was able to output + 5V normally. However, the output of the + 15V and -15V boards are not normal, the lights will not light up, and the high voltage cannot be adjusted. Does anyone know where the problem might be? I suspect one of transistors has burned out.

Here is the list of components I ordered.


844-IRF9530PBF for -15V is less ordered in this list.

Last edited by yunyun; 29th November 2019 at 03:02 AM.
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Old 29th November 2019, 12:32 PM   #1818
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Hey, don't post documents with your personal info on the internet. Removed.
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Old 29th November 2019, 12:55 PM   #1819
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
There was no IRF9530 in that order list indeed. What you put in its place?

Anyways, first read up close with a flashlight all the components and confirm they are the correct ones in the right places. The Rf resistors or links in their place must be there too. Else there will be discontinuity.

Make replacements if necessary. When all are correct read voltages Vgs for MOSFETS and Vbe for BJTs.

Lets us know those readings.
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Old 29th November 2019, 01:26 PM   #1820
yunyun is online now yunyun
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I deleted my profile and posted it again. I have purchased 844-IRF9530PBF nearby, but not from Mosuer.

My three boards are + 5V, + 15V, -15V. When I soldered the components on the + 5V board, it was able to output + 5V normally. However, the output of the + 15V and -15V boards are not normal, the lights will not light up, and the high voltage cannot be adjusted. Does anyone know where the problem might be? I suspect one of transistors has burned out.

Here is the list of components I ordered from Mosuer.

OrderHistory (2) (1).pdf
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