Connecting 5-LED Strip to 4xAA Basket or 9V Battery: Resistors & Compatibility

Hello,

I would like to connect a LED strip with about 5 LEDs from, for example, such a tape

http://allegro.pl/tasma-pasek-led-zimna-biala-5m-300-diod-smd3528-i5345782689.html

is it possible to power them from a battery, e.g. a 4xAA basket or a 9V battery, would I have to insert any resistors?

I know, I know, I don't know much about it, that's why I'm asking.

Thanks in advance for your help

In such a tape, the LEDs are connected by 3 in series, so switching to a parallel system is a bigger modification. Better to use a small converter or a 6V module. 8 batteries can also then be a 12V tape.

ok, then I can connect 6 diodes from such a basket, right? do I have to add any converters when giving 8 batteries? what about resistors? then how to connect the baskets with the LED strip?

8x 1.5 = 12 you don't need to add anything. On good batteries, such a piece of power of 1-2W will work for about 10 hours.

D214d3k wrote:

8x 1.5 = 12 you don't need to add anything.

Rather, it has to - it should feed it through the inverter. Partially discharged batteries will have a much lower voltage and the discharge voltage for them is 1 V / cell, which will give a voltage of only 8 V with 8 cells. there will be plenty of energy left in the batteries. The direct connection of the battery with the diodes will cause that only a small part of the capacity will be used and the tape will not glow equally bright all the time. Therefore, I suggest connecting the belt via a DC / DC converter (available for purchase on all-trade for a few zlotys). This will ensure full use of the battery and the same brightness of the LEDs all the time.

D214d3k wrote:

On good batteries, such a piece of power of 1-2W works for about 10 hours.

The 6 LED section of the 3528 tape has a power of 0.48 W. Good alkaline batteries have a capacity of 2500 mAh. At a voltage of 12 V it gives 30 Wh of energy - it will allow it to glow for about 60 hours. Of course, in practice, this time will be shorter due to the losses in the battery and inverter. But it's still over 2 days of continuous lighting.

ok so i'll do that too.
when it comes to the inverter, it should be like this?
http://allegro.pl/przetwornica-24v-12v-dc-do-kamer-cofania-fv-i6140398088.html
then set it with this screw to the appropriate voltage and select it with a meter, right?

I would rather not use a step-up converter and power it from parallel-connected li-ion batteries.

ananasowo wrote:

when it comes to the inverter, it should be like this?

This inverter is not really. Better will be this:
http://abc-rc.pl/przetwornica-dc-dc-mt3608-2a-4-28v
It is also available on alledrogo - auction number 6177367301. The price is only PLN 7 and it's enough for you.
For this you can use a basket of 4 AA batteries, 9 V batteries or even li-ion batteries as suggested by a colleague. You have a lot of possibilities. All you need to do is set the appropriate input voltage - of course, remember that it is a voltage-increasing converter, so its input voltage must be lower than the output voltage.

I got a little lost with this LED power supply.

Initially, as I looked at, the LED strips have a 12V power supply, and depending on how much we cut, the power consumption changes.

So theoretically, if I have 1.3 diodes or 10, I should give a voltage of 12 V anyway, right?

But then I see videos where for several diodes they give one 9V battery or 3 1.5V batteries and it works ?!
For example this one here you can see how he takes the tape and the inscription 12 V on it, but a moment later when he takes a single diode, it shows a box for 3 1.5 V batteries and has to calculate something and LOWER the voltage to 3.5 V?
Is it about the fact that there is also some kind of step-down resistor on this tape?

Why do they make a 12 V tape as soon as they have to lower this voltage themselves?

But on the other hand, this one here cuts the tape (not individual LEDs, here I assume that it is a 12V tape but I'm not sure), and then connects everything without any additives with a 9V battery (i.e. it's also just my guess because I do not have 100% or a 9V battery ) and it works too?

There are also LED strips powered by 5V. https://www.led.micros.pl/kategoria-tasmy-led,-5v-388.html

Because I only need 40 cm of tape, it is a pity for me to buy such "kilometers" per meter (it's about backlighting a plexiglass statuette).

This is another question in a different context.
Because I read a bit and I don't know if I understood correctly, but this tape is not only supposed to hold and connect these LEDs, but also its important function is - heat dissipation?
And (ignoring the issues of voltage selection, etc.) it is not enough that I take and solder a few LEDs and stick them to some sticky tape, because the first thing that will happen to me is overheating of these LEDs?

It depends on the diode. Some require a heat sink (the more powerful ones) and some do not

And it's not that there are only a few types of these LEDs (e.g. listed here) http://oswietlenie-ledowe.com.pl/tasmy-led-poradnik-cz-1/ and these five have some standard parameters ( current, voltage, etc.), or do you mean that within these, say, five groups, there can be diodes with different parameters in each group depending on the manufacturer?

The voltage depends on how the diodes are connected. Most tapes are for 12V and are connected by 3 in series and a resistor. You can also buy a 5V strip, then each diode has its own resistor. Regarding the standardization, it seems to me that they are different, e.g. for 2835 and 60led / meter it is sometimes 4W, sometimes 6W / meter. Of course, as long as you believe the data provided by sellers

It would be more about the parameters (voltage, current, ...) of a single diode.

And how much power in these tapes, it probably depends on how they divide a single "section" of such a tape. If they come up with 3 diodes in a section (in series), they check how much voltage they have for this section, they choose a resistor for 12 V so that they do not burn the diodes, and then ... it all depends on how many such sections there are for any given length of tape.

Now I mean whether the parameters for a single diode (a specific type / no.) Are standard and the same or whether it depends individually on a specific manufacturer diodes (no tapes) will fix?
For example, in this video I gave at the beginning, where did he get that for this diode the appropriate voltage is 3.4V and 50mA? Is there a standard for this type of diode he used?
Or where he got from this table where the voltage depends on the color?

I will only comment on the tables. It results from the physical properties of the PN junction. Red LEDs have the lowest voltage while blue LEDs the highest. White is a mixture of the three primary colors. And the sequence of colors and voltage at which the diode conducts occurs always.
With a diode tester you would be able to determine this voltage. Below it, no current flows, so the LED is off. Above, there is a very fast increase in current until the joint is damaged due to the power that is released. Of course, as long as there is no series resistance limitation.

This is perhaps this example.
Such lights let's say Christmas trees.
You can see 2 1.5 V batteries (99%).
Lots of LEDs so definitely not in series. If it is white light, it seems that just 2 batteries are enough (3 V), so no additional resistors are needed.

Are there SMD LEDs or the 'older' ones?
If SMDs do not need cooling due to their specific (low) power consumption, or maybe there is some cooling with these LEDs, but you would have to take a closer look at them?

There are standard 5mm long legs for cooling, and an unpleasant smell for signaling overheating . Such (and similar) sets can be purchased in supermarkets and decoration stores for PLN 7. But as written above, such a system will not use the battery 100% rather than 20%.
With this power it is different, because in such a small SMD 50x50 it happens that there are 3 structures of 0.18W each. More precisely, it was like that 7 years ago I bought such tapes and today someone has given more.