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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.

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Old 15th Apr 2019, 2:04 pm   #1
NickG0HIK
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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
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Old 15th Apr 2019, 2:36 pm   #2
factory
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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.
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Old 15th Apr 2019, 2:58 pm   #3
NickG0HIK
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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.
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Old 17th Apr 2019, 7:57 pm   #4
NickG0HIK
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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
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