Salas SSLV1.3 UltraBiB shunt regulator - Page 182

Salas · 14th November 2019, 10:43 AM

Quote:

Originally Posted by Harry3

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.

Harry3 · 14th November 2019, 11:29 AM

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.

Salas · 14th November 2019, 12:33 PM

Perfect then.

kenneth_obee · 16th November 2019, 01:59 PM

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!

Salas · 16th November 2019, 02:16 PM

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".

kenneth_obee · 16th November 2019, 03:18 PM

Quote:

Originally Posted by Salas

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!

yunyun · 03:02 AM

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.

Salas · 29th November 2019, 12:32 PM

Hey, don't post documents with your personal info on the internet. Removed.

Salas · 29th November 2019, 12:55 PM

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.

yunyun · 29th November 2019, 01:26 PM

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

16th November 2019, 01:59 PM	#1814
kenneth_obee diyAudio Member Join Date: Feb 2010 Location: Hong Kong	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!

29th November 2019, 02:54 AM	#1817
yunyun diyAudio Member Join Date: Jun 2019	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.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
GB Thread for Salas SSLV1.1 BiB shunt reg	Tea-Bag	Group Buys	1674	8th June 2019 07:08 PM
FS: Salas SSLV1.1 BiB shunt regulators	Rudi_Ratlos	Swap Meet	2	2nd April 2018 04:20 PM
WTB: Salas SSLV1.1 BiB shunt reg	KevinHeem	Swap Meet	1	12th February 2015 06:04 PM
WTB: Salas SSLV1.1 BiB shunt reg positive board	sbelyo	Swap Meet	1	29th December 2014 04:17 AM
WTB : Salas SSLV1.1 BiB shunt	CaNNA3IS	Swap Meet	1	24th November 2013 10:43 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

14th November 2019, 11:29 AM	#1812
Harry3 diyAudio Member Join Date: Mar 2005 Location: Sydney - Australia	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.

14th November 2019, 12:33 PM	#1813
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Perfect then.

16th November 2019, 02:16 PM	#1815
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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".

29th November 2019, 12:32 PM	#1818
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	Hey, don't post documents with your personal info on the internet. Removed.

29th November 2019, 12:55 PM	#1819
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	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.

29th November 2019, 01:26 PM	#1820
yunyun diyAudio Member Join Date: Jun 2019	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