gkm1 said:hi i want to know the purpose of IC ULN2003 in a solar cell tracking circuit
can ULN 2003A be used for 12v out put??? what is the procedure?mvs sarma said:gkm1 said:hi i want to know the purpose of IC ULN2003 in a solar cell tracking circuit
Perhaps if you upload a schematic it may be possible to comment. the chip is an seven Darlington arrays. may be they might have used for relay drives or motor drive if the panel is driven for catching Sun.
chip sinks current but not Voltage :idea:GrandAlf said:2003a will sink up to 60v? @500ma per output, subject to total package dissapation limit. This means that the load must be connected to +, up to max volts, and is grounded via 2003 when an input applied, usually active high logic output 3-5v. Google for data sheet. Possibly used for stepper motor driver in this application.
GrandAlf said:2003a will sink up to 60v? @500ma per output, subject to total package dissapation limit. This means that the load must be connected to +, up to max volts, and is grounded via 2003 when an input applied, usually active high logic output 3-5v. Google for data sheet. Possibly used for stepper motor driver in this application.
best is to check with reference to datasheet . however, you may post a small scchematic for better visualization, and to help further discussion.sn_burki said:GrandAlf said:2003a will sink up to 60v? @500ma per output, subject to total package dissapation limit. This means that the load must be connected to +, up to max volts, and is grounded via 2003 when an input applied, usually active high logic output 3-5v. Google for data sheet. Possibly used for stepper motor driver in this application.
I am using ULN 2003A to drive 7 segment gaint display(common anode) with each segment in series of 5 LEDs + resistor 100 ohm, I am using this chip to drive segments, next to controller and for display's common I am using 1015 transistor on bias 10K ohm resistor, I connected pin no. 9 of ULN 2003A to 12 V and emmitor of transistor also to 12V but it is not working in my circuit I dont know why??? is there any problem in this circui??? How much current 1015 can suport??? plz help.
regards
it is A1015?GrandAlf said:Not sure what a 1015 is it PNP. If so sound like you have it right, would require 0 input to switch. Normal would be to use NPN transistor, collector to plus and emitter to display anode. Switch with + input.
please upload your schematic!!sn_burki said:yes it is A1015 pnp transistor but the circuit is not working,, why ??? although everything is right.
I have done the same checking but I noticed one thing that when i check output from the controller which go to ULN 2003 on logic prob it shows pulses it means that the controller is working but when i check output on ULN 2003 output it is continueously high(logic 1). is it due to I have connect ULN 2003 pin to +5V???GrandAlf said:You can test your basic circuit by grounding the transistor base on one of your displays and then applying a high input to pins 1-7 on the uln2003. This should light up each segment in turn. If this is ok, you can test the rest of the displays in this manner. If this works, then the fault is whatever you are driving it with. Remember transistors need low inputs and the 2003 needs high.
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