Electronics > Beginners

Weird relay module driving

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soldar:
Like this. You can use gates with schmitt trigger inputs to shape the input. Connect the 9 V through two gates.

CD4093b - quad nand gate with Schmitt trigger inputs

http://www.ti.com/lit/ds/symlink/cd4093b.pdf

ReWoP:
Thanks you both for all the info!  :clap:

I don't thing than i have any nand gates IC, i thing ill have to order it and try that. :-+ :-+ :-+

But i found out that i have a over voltage and under voltage circuit board that operates a relay. I can program it to latch the relay if the monitored voltage is 0v, the problem with this board is that at startup the relay will latch because is 0v...

Is there a way to turn on this board only after the 9v is present then the board will take care of the relay when it goes back to 0v.

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