How to make an economical battery powered garland?

S

Stanislav Kim2016-01-09 07:38:45

Electronics

Stanislav Kim, 2016-01-09 07:38:45

Does anyone have a diagram or can someone help in drawing it up?
It is required to make a LED garland.

20 to 40 LEDs (20mA, white, 5mm)
three finger batteries (3 x 1.5V = 4.5V)

The garland should work more than 60 hours. A simple circuit with a parallel or series connection through the resistance will not work, the flow is too high.

Reply

Answer the question

In order to leave comments, you need to log in

2 answer(s)

A

artanets1, 2016-01-09
@artanets1

I doubt this idea a little, because 20mA x 20pcs = 0.4A x 60h = 24A it seems to me that no AA batteries are enough (if I correctly calculated the consumption in ampere hours).
And so, in principle, I agree that PWM is suitable.
this is a good calculator

A

Alexey S., 2016-01-09
@Winsik

PWM is our everything
electrik.info/main/praktika/824-regulirovanie-yark...