piclist 2000\01\18\111719a >
Thread: Driving Relay
www.piclist.com/techref/io/motors.htm?key=relay
picon face BY : Jane Ifurung email (remove spam text)



I'm using a +5V DPDT relay and I had a problem with
regards to energizing its coil. I tied one end of its
coil to +5V and the other end to an AND gate output
(MM74C08N). The relay should be energized when the
output of the AND gate is logic 0 and deenergized when
logic 1. However, when the AND gate is supposed to
output logic 0, it always stays to logic 1 (this is
when it is connected to the relay). Does this mean
that the AND gate is being loaded by the relay? ....
sort of loading effect?

I also tried using AND gate buffer (CD4081BCN) but to
no avail. It can't drive the relay.

.... Now, I was able to solve the problem stated
above. At the AND output I inserted a buffer(74F244)
and tied the buffer output to the other end of the
relay coil. It worked!

My question is, is there an alternative solution?
Buffer consumes space.

Jane



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Jane Ifurung
UP Diliman, Quezon City
920-5301 loc 5854
(632)731-3545
jifurungspamspamspameee.upd.edu.ph
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