UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > General Vintage Technology > Components and Circuits

Notices

Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets.

Reply
 
Thread Tools
Old 15th Apr 2019, 2:04 pm   #1
NickG0HIK
Pentode
 
NickG0HIK's Avatar
 
Join Date: Jul 2010
Location: Ireleth-in-Furness, Cumbria, UK.
Posts: 190
Default Instruction on Melcher switching regulator modules type SMR126ER-7 & PSR128 Please

This maybe a long shot, but this forum always seems to come up trumps with information so it is worth a try.

I obtained these at Hack Green at the weekend and would really like to use these modules with my radio kit when out portable.

They seem to work when putting a supply on them, but they can be trimmed with external resistors.

I'd love to see a datasheet for them, but any information might help.

I can find instructions on line for similar modules, but not the exact ones.

I remember ordering and using these 20 - 25 years ago when at work, so they were likely supplied by the likes of Farnell or R.S.

Many thanks

Nick
Attached Thumbnails
Click image for larger version

Name:	20190415_135513.jpg
Views:	50
Size:	52.3 KB
ID:	181377   Click image for larger version

Name:	20190415_135504.jpg
Views:	52
Size:	59.1 KB
ID:	181378   Click image for larger version

Name:	20190415_135456.jpg
Views:	42
Size:	56.1 KB
ID:	181379   Click image for larger version

Name:	20190415_135447.jpg
Views:	35
Size:	44.7 KB
ID:	181380  
NickG0HIK is offline   Reply With Quote
Old 15th Apr 2019, 2:36 pm   #2
factory
Hexode
 
Join Date: Jul 2009
Location: Cheshire, UK.
Posts: 315
Default Re: Instruction on Melcher switching regulator modules type SMR126ER-7 & PSR128 Pleas

These power supplies were very common at work too, we never had any service info either so they got binned if faulty.
Melcher became Power-One, who have since been taken over by Belfuse.

You probably won't find the exact model, but will find an equivalent with higher power rating for the size.
Edit: they don't seem to do anything in that series with those voltage ranges and output current above 3A any-more.

PSR range;
https://www.belfuse.com/product-deta...onsProductType

David

Last edited by factory; 15th Apr 2019 at 2:45 pm.
factory is offline   Reply With Quote
Old 15th Apr 2019, 2:58 pm   #3
NickG0HIK
Pentode
 
NickG0HIK's Avatar
 
Join Date: Jul 2010
Location: Ireleth-in-Furness, Cumbria, UK.
Posts: 190
Default Re: Instruction on Melcher switching regulator modules type SMR126ER-7 & PSR128 Pleas

Thanks for the info and link David.

I'll have a play later.

Six and eight amps is handy, it is enough to power my existing portable setup and I plan to try it with some Li-ion cells, as the capacity of these are great, but you don't get a suitable supply from them to power 12volt equipment.

Nick

Last edited by NickG0HIK; 15th Apr 2019 at 3:22 pm.
NickG0HIK is offline   Reply With Quote
Old 17th Apr 2019, 7:57 pm   #4
NickG0HIK
Pentode
 
NickG0HIK's Avatar
 
Join Date: Jul 2010
Location: Ireleth-in-Furness, Cumbria, UK.
Posts: 190
Default Re: Instruction on Melcher switching regulator modules type SMR126ER-7 & PSR128 Pleas

I've just had a play with the switching modules.

They all work.

The PSR128 needs a 270k resistor between R and Vo+ to give 13.8v out.

The SMR 126, requires a 2k resistor between the two "Sense" terminals to give 13.8v out.

Many thanks for the help and info.

Nick
NickG0HIK is offline   Reply With Quote
Reply

Thread Tools



All times are GMT +1. The time now is 11:45 am.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright ©2002 - 2018, Paul Stenning.