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Damn! I missed the above posts guys. I don't know how. I'm just not used to this forum format. Please ignore my above post. Thanks a lot for all the help! Adam

Okay guys, still stuck..... This missing pulse detector won't do the job either.... Is there a circuit, there has to be, that would look for a 100Hz or so square wave that will turn on when it sees this modulation and turn off when it does not? I'm pulling out my hair trying to find such a...

Got it! Thanks a lot for your help! I designed a "Missing Pulse Detector" around a 556 timer and it looks like it should work great. Thanks Again! Adam

That is just not possible in my application. This device is being sold to hundreds of different clients.

Hi VE1BLL, Thanks for your post. My problem is that this system is designed to fit a DB-25 cable. I want an interlock that is virtually fail-safe. You see, if someone plugs this into a parallel port on a computer and the device receives a 5V signal,,,(if that is what it is looking for as you...

Oh, sorry for the double post but I forgot to add something. I would like the circuit to be able to ignore possible voltage drop and possible noise due to the length of the cable. I can't imagine these circumstances would greatly interfere as it is a shielded cable and the maximum loop length...

Hi Everyone! I am looking for a schematic for this circuit but I cannot seem to find anything. What I am looking for is a simple circuit that it most likely 555 timer based. What I want it to do is send a 5V square wave signal, maybe 10-100Hz, through a 12' to 200' max through one lead on a...