You sure?
Check and make sure is not a 10¢ BONENS or BOCHEN or BORTUN.
Your right Bonens....sorry
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Your right Bonens....sorry
Just having a little fun.
Subtract shipping from that $2.17 recommendation and you end up with a 49¢ assembly. Assuming the vendor makes something on it might cost him 20¢. Not a lotta room room there for branded components.
From the datasheet for the LM2596:
ON /OFF —Allows the switching regulator circuit to be shut
down using logic level signals thus dropping the total input
supply current to approximately 80 μA. Pulling this pin below
a threshold voltage of approximately 1.3V turns the regulator
on, and pulling this pin above 1.3V (up to a maximum of 25V)
shuts the regulator down. If this shutdown feature is not
needed, the ON /OFF pin can be wired to the ground pin or
it can be left open, in either case the regulator will be in the
ON condition.
It could be the 5 pin is not pulled down and grounded. Just not used on these cheap boards.
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Willy's right, at least on mine...I just grabbed my module (v. whatever?)
View attachment 74523
I metered pin 5 to ground...continuity...need to lift that pin off the board or kill the trace...easier to lift the pin I think, no big deal...
Thing is, I think there are so many versions of these modules floating around out there...I mean, why would my particular v. have those 2 holes on the pin 5 pad if all it is is an alternate ground connection?...seems pretty redundant. I think the original manufacturer boilerplated the pcb cct layout as much as possible to allow for multiple solutions with just a little tweeking...Chinese import/export companies selling on ebay trade these things like hockey cards, not really knowing (or caring) what v. they're selling and you get what you get...jhonutz's schematic was most likely based on the v. he had in hand which had no jumper between 5 and ground.
meh, for all we know, the reason we get things so cheap is because the manufacturer over ran production on the jumped v. and they just dumped them on the market via their ebay schepers re: a little bit of cost recovery
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My schematic is based on lm2596 datasheet.I don`t use module allready made, i make custome PCB see schematic and drawing PCB in Eagle.I don`t know that module what you have, but is conformity with my schematic aproxim.
Well that explains it then...god I wish I had the equipment to do that, you've seen the guts of some of my mods and the "rats nest of wires"
Did they show any schematics where the pin was not pulled to GND?
Easy enough the figure out put your meter on pin 5 and the IC's tab (or any GND) and check for continuity. Whatcha get?
FWIW the higher end, better, larger blue assembly also has pin 5 grounded.
But it should be easy enough to just desolder and lift the pin off it's pad.
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Question WillyB: Is it necessary to use a resistor or can I just use my 12v source to pin 5 since the specs say up to 25v? If I disconnect pin 5 connect the 12v source to it and use a NC switch from it to gnd it should work? Thanks!
That is a good question, but if you have a straight 12V (+) going to pin 5 and a NC switch to GND (-) wouldn't that be a dead short?
Yes you are correct but isn't jhonutz diagram a direct short when the switch is closed, only the voltage reduced by a resistor.
no..not voltage is problem, current you need to reduce.For this need that resistor.
And that diagram works 100% tested and made a lot of mods with that.
And that diagram works 100% tested and made a lot of mods with that.
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no..not voltage is problem, current you need to reduce.For this need that resistor.
And that diagram works 100% tested and made a lot of mods with that.
OK thanks I ordered some 330k 1/4 w as you suggested for my 12v source.
Lack of knowledge of what a resistor does. Just assumed it reduced voltage.
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DC-DC Buck Converter Step Down Buck Module 4.75-24V to 0.93-18V 2.5A | eBay
This looks interesting with a switch installed that could be easily changed to a mini NC push button... I refer to changing the switch because I think it stays on or off.
http://www.ebay.com/itm/Portable-Po...923?pt=LH_DefaultDomain_0&hash=item1e6aaff773
This could be a monster camping mod...
This looks interesting with a switch installed that could be easily changed to a mini NC push button... I refer to changing the switch because I think it stays on or off.
http://www.ebay.com/itm/Portable-Po...923?pt=LH_DefaultDomain_0&hash=item1e6aaff773
This could be a monster camping mod...
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Replace the rocker switch with the same size momentarily on rocker and the atty connecter where the 3.5 mm out. If you wanted more room just remove one battery as this is a boost and the batteries are parallel. The cover is pretty deep and you could probably fit a switch over the led light.
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Love the fact they are using a Uni-T meter. Got one coming on the way, they are an inexpensive mid end meter that has gotten some pretty decent reviews lately. Pretty well liked because they have features similar to the 12buck meter models.
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