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goelvaibhav
12-04-2009, 02:26 PM
Hi

I have to drive LEDs from a uC. The current that the LEDs need cannot be sourced through the uC pins. Therefore, I have to use something like ULN2803.

Can someone suggest a better alternative to ULN2803 as its has a drop of around 1.5V. The current required is 160mA.

Regards,
Vaibhav

samurai_01
12-04-2009, 03:28 PM
why don't you try uln 2003.
it wont give such a large potential drop and costs just 10-15rs and can b easily obtained at any general electronics shop.

Nivedita
12-05-2009, 09:50 AM
why don't you try uln 2003.
it wont give such a large potential drop and costs just 10-15rs and can b easily obtained at any general electronics shop.

Check number of channels available for ULN2003 as against ULN2803.

docel
12-08-2009, 01:18 AM
:?: What is the problem :?: :?:

The ULN2803 & ULN2003 have identical drive / OP characteristics. If one doesn't work the other wont, too.

As far as i can see, there is no problem here at all except wrong connections.

It will be easy if you tell us what is NOT happening, along with your connection diagram.

Both the Ics have no problem driving a 160ma load and the 1.5v drop doesn't matter in the least since the collector voltage can be anything up to 33vdc.

Nivedita
12-08-2009, 01:44 PM
The ULN2803 & ULN2003 have identical drive / OP characteristics. If one doesn't work the other wont, too.


ULN2003 has 7 channels

ULN2803 has 8 channels

Recently I have not read the current & voltage related specs, so no comments on it.

tpsbpl
12-11-2009, 06:17 PM
use 2N3904 with 10K resistor in series