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Driving 4 LEDs and 4 Relays with a ULN2803?
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Topic: Driving 4 LEDs and 4 Relays with a ULN2803?
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BlueBill
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Driving 4 LEDs and 4 Relays with a ULN2803?
Nov 18, 2012, 05:20 pm
Any thoughts on problems driving (sinking) 4 LEDs on the 5V rail and 4 Relays on the 12V rail with the same ULN2803? (diode clamp on 12V rail)
johnwasser
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Re: Driving 4 LEDs and 4 Relays with a ULN2803?
#1
Nov 18, 2012, 06:01 pm
Since the 5V and 12V supplies go to the same Ground there should be no problem sinking either or both.
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MarkT
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Re: Driving 4 LEDs and 4 Relays with a ULN2803?
#2
Nov 19, 2012, 12:28 am
Yup, the diodes only needed on the relay windings so that should be fine. Don't forget current-limiting resistors for the LEDs.
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