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MCC & Cars


100 SMD leds on a second power source?

Netherlands

Hi!

For a new project (Coca Cola christmas truck) I want to build in 100 yellow smd leds. I want to connect these leds to a second, 2,4v, power source.

The big question is: how do I do this?

The most ideal situation is to make it happen with an v1.1 decoder, cause i've still got some...

Thanks!

Greets,

Gerard

Netherlands

Gerard,
maybe just use a separate (3,6V) battery pack and a switch? The truck has plenty of space. You can even use a plain 9V battery.

Hans.


Netherlands

Hans,

No switch for me... i want to turn the lights on /off with the decoder...


Greetz,


Gerard


Netherlands

Gerard,
then you have to switch them using a transistor. And here is where my practical knowledge stops...
You will have to find a transistor that you can control with the output of the 1.1v decoder.

Hans.


Netherlands

Hi Gerard,

Sounds like quite a lot of LEDs ;-)

If you have a power source of 2,4V you can drive yellow LEDs without a problem. If you connect the LEDs in parallel with series resistor you can switch them with e.g. a BSH103 mosfet. The BSH103 can drive 800mA. I would not stretch it to that limits, e.g use 400mA max. If you need more, just put a second BSH103 in parallel.

If you want to drive white LEDs from 2,4V you'll need a step-up converter. You can make a white LED driver with e.g. a TPS61070 and a few additional components. The TPS61070 can be switched on/off by a decoder (1.1) output.

If you have 3,6V you can drive/switch white LEDs in the same way as the yellow ones: with a BSH103

If you want I can make some diagrams for you after my holiday. Be aware that you'll have to do some SMD soldering.

Kind regards,
Leon


Netherlands

Hi Leon,

It are just yellow LEDs, so 1 use a second 2,4v source.

I would be pleased with a diagram how to use the BSH103.

Have a nice holiday,

Greetz,

Gerard


Netherlands

Hi Gerard,

A diagram and description can be found at tiki-index.php?page=MCC+versterker&bl=n

It would be nice if someone could make an English translation.

Kind regards,
Leon

Netherlands

Leon,

I translated the page. I am not sure if the page is at the right place.

Regards,

Arnold


Netherlands

Hi Leon,

Thank you! I'm going to test it out as soon as i have got my coca cola truck (bought on ebay.de)

Thanks again.

Greetz,

Gerard


Netherlands

Hi Leon,

When I want to connect the 100 LEDs to and second 2,4v battery pack, I just connect the LEDs to the + of this second pack, and the GND to the GND of the decoder?

Thanks

Greetz,

Gerard


Netherlands

Arnold,
The page is nicely translated and in the right place too.

Thank you!
Hans.



Netherlands

Hi Gerard,

Yes, the anodes (+) of the LEDs can be connected to the (+) of your second battery pack.
Note that the current flows from (+) of your secondary battery via the resistor - LEDs - BSH(d) - BSH(s) to the (-) of your secondary battery. The connection output - BSH(g) is to switch the FET and the connection GND - BSH(s) must be there for reference.

Arnold,

Many thanks for the translation! I made a few minor modifications.

Regards,
Leon

Netherlands

No problem Leon. For me it was the fun to see how good (or not) my English is 14 years after school.

Arnold



Netherlands

Hi Gerard,

my compliments! looks wonderful. Any pictures of the steering mechanisme and inside?

Hans.


Netherlands

Hi Hans,

Thanks!

I just added 2 pictures from the steering meganism en the internal of the truck.

Greets,

Gerard


 
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