Electronics > Projects, Designs, and Technical Stuff
Two IR LEDs in series, powered by 18650
Peabody:
--- Quote from: bin_liu on June 13, 2020, 02:58:02 am ---Power consumption is inevitable. The problem is how to work reasonably. My suggestion is to use a constant current circuit.
--- End quote ---
I will look again at a constant current solution. I had concluded I wouldn't be able to use two LEDs in series and have it work down to a battery voltage of 3.5V or so. But I will try out your circuit.
bin_liu:
I don't know what type of infrared emission tube you are using, such as this IR333-A, if the current is not large, two series work is also feasible.
Really, if the emission current is large, it is recommended to use two parallel work.
Buriedcode:
A constant current circuit seems a bit over kill for a remote. It's not visible illuminate that has to be consistent, and a constant current circuit will just drop voltage across a resistor and transistor. As your cell discharges, the output will go down, but unless you're trying to make the remote work at extended range, I don't see how it'll matter. Often the range of remotes is more determined by the receiver (those TSOPxxxx receivers are awesome) and ambient lighting, and given the low duty its why most remotes just have one emitter running at rather high power.
Try it, maybe with a constant current circuit, and test the range. You might find you can get away with a lower current that you think, which would keep the Vf < 1.4 allowing for two LED's. But if the range is fine with one anyway, then it doesn't matter. And if the range isn't good enough, you can play with the resistor to determine emitter current.
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