would these work

[lynch]

Seen these for the first time on ebay and want to know if they would work in a mod

LM2596 No-isolation DC-DC Converter Power Supply Module IN 4-35V OUT 1.25-30V 3A | eBay

 

[jhonutz]

LM2596 works in a mod, from ebay i don`t get a pictures of PCB, probably it`s with adjustment trimmer and works.

 

[lynch]

I ask the seller of these to show me the other side of the 2596
and he said it's the same as the front without the marking ?
has anyone seen or used this type ?

 

[BJ43]

The dimensions would be good also as they could take up a lot of room in a mod.

 

[SteelJan]

Looks like it drops a lot of voltage across it, 2.75V loss. So, if you put two 3.7V batteries in series in it, so you'd have 7.4V, and you lose 2.75V right off the bat from the conversion, you will end up with 4.65V and go lower from there as the batteries deplete during use. Is that what you wanted to do?

And yes, dimensions? Does not say what size it is.

 

[lynch]

Hi steeljan love your vids. They told me size is 70*45*18mm.
Think I will get one to see how they are. Like I dont have enough stuff

 

[jhonutz]

In your pictures i see that electronics PCB is into a plastic box. After you buy may remove that mini box and reduce dimension. .

where did you see 2.75V lose?No way it`s impossible that circuit LM2596 have only 0.2 to 0.3V under load. I made a lot of regulators with that circuit, if it`s made correctly works very well

 

[DaveP]

The datasheet for the chip shows it to be a little under a half inch by a half inch. A heat sink is recommended for application. It looks to me that it can be set up to regulate with a fixed output voltage or as a variable output in various application setups. The spec below that says it can regulate from 4.75 less than input voltage to 40v.

VOUT Output Voltage = 4.75V <= VIN <= 40V, 0.2A <= ILOAD <= 3A

The way I read this to be makes it variable from 2.65v-7.4 with stacked 3.7v batteries. This would be a stacked battery mod that could go thermal on you. I certainly wouldn't try to put it into a tube mod that could build pressure and blow.

It can't produce more voltage than the input voltage, so it couldn't be used with a single Li-ion battery.

http://www.datasheetcatalog.org/datasheet/nationalsemiconductor/DS012583.PDF