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-   -   GB for Salas L-Adapter Board (https://www.diyaudio.com/forums/group-buys/338109-gb-salas-adapter-board.html)

Tea-Bag 19th May 2019 03:27 PM

GB for Salas L-Adapter Board
 
This thread is for a group buy for a new Salas board L-Adapter.

This regulated supply can do ~1.5 to ~20V higher current rates than previous shunt supplies offered by Salas. The board is 136mm x 63mm, 2oz copper, 2mm thick.

The amount of Digital Devices such as Raspberry Pi, wall-wart devices and DACs using lower voltage and increased current is growing and the desire for non Brick or USB power supplies has come knocking on our door for some time.

L-Adapter Technical and Build Thread:

https://www.diyaudio.com/forums/powe...ml#post5761291

The Board L-Adapter USD$18 each
https://i.imgur.com/xjQY33d.jpg

https://i.imgur.com/xXzzZKR.jpg

Built up pictures

https://i.imgur.com/IA3z02t.jpg

https://i.imgur.com/VX2jZRq.jpg

https://i.imgur.com/fekqgk2.jpg


LED orientation
https://i.imgur.com/6bG4SBn.jpg


The BOM for the board is really strait forward. The Transistors do not change regardless of voltage or current. All parts are available from Mouser for those who have easy access and shipping arrangements with them. Minkits will be offered and can shipped as flats internationally for a lower shipping price than full kits. Full kits are going to be offered as well, but will demand a significantly higher shipping costs as the heatsinks and caps require package shipping internationally. Minikits and full kits ship domestically at a lower rate. The full kit based around the expected needs to power a Raspberry Pi. Some lower current devices may not need the diode heatsinks, some higher current ones will need to mount the diodes and the TO-3P transistor directly to a chassis and or heatsink.

Tentative BOM below. $ TBD
L-ADAPTER BOM DiyA - Google Sheets

Why these parts were chosen Diodes, Fuse, HS
The diodes are rated up to 200V and 30A, so these are higher than the regular MSRF860 that I ship with other kits. These can handle more current, have a low vF and are fast recovery. The Fuse is slow blow version chosen via Salas that will be able to handle transients above it's 8A rating. It's being used in the Power supply as part of a CRC Filter. The heatsinks are chosen for common dissipation needs.
Higher cap values can be used than 6800uf, but may need a In-rush current limiter to avoid problems. Caps should all be 105c rated, as this unit can produce heat when being run hard!

Sign up sheet is in my signature. GB Close date is not yet chosen. Please follow thread for updates and interest.

Rush 19th May 2019 07:43 PM

Shorting plugs for lack of a better name
 
Tea Bag,

I didn't see in the BOM any shorting plugs for the "Headers & Wire Housings 09+09 DIL VERTICAL PIN HEADER TIN."

Can you point me in the directions of those. As I understand, they are used to adjust the output voltage by energizing the stack of LED.

Rush

Tea-Bag 19th May 2019 08:19 PM

Quote:

Originally Posted by Rush (https://www.diyaudio.com/forums/group-buys/338109-gb-salas-adapter-board-post5796398.html#post5796398)
Tea Bag,

I didn't see in the BOM any shorting plugs for the "Headers & Wire Housings 09+09 DIL VERTICAL PIN HEADER TIN."

Can you point me in the directions of those. As I understand, they are used to adjust the output voltage by energizing the stack of LED.

Rush

There are plenty on ebay,
Mouser techs could not find one. Find that hard to beleive.
I can put those in minikit. They are not expensive. Of course they are not essential if you just wanted to use a wire there anyways and solder it in.


Something like this.
NEW RED 10x Mini Micro Header 2.54mm 0.1" Circuit Board Shunts Short Jumper USA | eBay

jimk04 19th May 2019 09:07 PM

Interested in minikits pending final cost to the UK

skunark 20th May 2019 12:17 AM

Shorting pin? Harwin M7567-05 Mouser # 855-M7567-05

Tea-Bag 20th May 2019 01:15 AM

Quote:

Originally Posted by skunark (https://www.diyaudio.com/forums/group-buys/338109-gb-salas-adapter-board-post5796613.html#post5796613)
Shorting pin? Harwin M7567-05 Mouser # 855-M7567-05

SWWEEETT. Thanks. Adding to BOM.

carsten.witt 20th May 2019 10:46 AM

@Tea-Bag,

did you know the shipping costs to Berlin / Germany (Sorry if I overhead that)?

Tea-Bag 20th May 2019 12:31 PM

Quote:

Originally Posted by carsten.witt (https://www.diyaudio.com/forums/group-buys/338109-gb-salas-adapter-board-post5796900.html#post5796900)
@Tea-Bag,

did you know the shipping costs to Berlin / Germany (Sorry if I overhead that)?

Depends more or less on what you order.
Likely, for international buyers except Canada.

10.00 for board. 2.00 for each additional board.

16.00 for board and one full kit.
24.00 for two full kits.

I have not measured out much beyond that.

dewdrop 20th May 2019 02:55 PM

@tea-bag,
What are the dimensions of the board?

Tea-Bag 20th May 2019 03:00 PM

Quote:

Originally Posted by dewdrop (https://www.diyaudio.com/forums/group-buys/338109-gb-salas-adapter-board-post5797079.html#post5797079)
@tea-bag,
What are the dimensions of the board?

The board is 136mm x 63mm

I will update the first post. Good thing to include.


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