shot
Well-known member
Hi,
I've encountered a situation I don't understand.
I'm perfboarding a relay to switch few signals simultaneously. It's a 12V relay - [ur=http://www.mouser.com/ds/2/418/RT2pb0411-205066.pdfl]TE RT424012F[/url]
Whenever I switch it for the first time it acts as it should. I measure 12V across the coil and relay closes. But when I switch the coil off and back on, next time I get around 3.7V across the coil. And of course, relay doesn't switch.
I have put the 1n4007 diode (also tried 1n4841 during the troubleshoot) and 100nF cap across the coil, the diode is I believe correctly oriented (from the ground to positive)... supply voltage is okay...
Why is this happening?
I don't undestand!
:-[
I've encountered a situation I don't understand.
I'm perfboarding a relay to switch few signals simultaneously. It's a 12V relay - [ur=http://www.mouser.com/ds/2/418/RT2pb0411-205066.pdfl]TE RT424012F[/url]
Whenever I switch it for the first time it acts as it should. I measure 12V across the coil and relay closes. But when I switch the coil off and back on, next time I get around 3.7V across the coil. And of course, relay doesn't switch.
I have put the 1n4007 diode (also tried 1n4841 during the troubleshoot) and 100nF cap across the coil, the diode is I believe correctly oriented (from the ground to positive)... supply voltage is okay...
Why is this happening?
I don't undestand!
:-[