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double pulse positive to single pulse neg

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t&t tech 
Platinum - Posts: 2,594
Platinum spacespace
Joined: October 05, 2008
Location: Trinidad and Tobago
Posted: January 23, 2014 at 12:31 PM / IP Logged  
I have a single positive siren output that pulses single positive on arm and double positive on disarm. I want to use this output to drive my negative trigger door locks. The lock is simple enough. The unlock is my issue. I need something that will activate with a double pulse positive only to generate a single negative pulse. A point in the right direction is all i need. Thanks in advance.
Platinum - Posts: 7,489
Platinum spaceThis member has made a donation to Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: January 30, 2009
Location: New York, United States
Posted: January 23, 2014 at 2:15 PM / IP Logged  

Not exactly cheap ( $18 ) but the PAC TR-7 will do what your want.  Use Feature #14, the Green wire for the (+) input pulses from the Siren, the White wire for the (-) output pulse to the Unlock wire and program for two input pulses within 3 seconds.

Here is a link to the PAC TR-7 guide  :

Soldering is fun!

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