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Greetings and a question or two.....

 
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Willie
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Joined: 17 Aug 2009
Posts: 1

PostPosted: Mon Aug 17, 2009 10:31 pm    Post subject: Greetings and a question or two..... Reply with quote

Howdy all!

I'm not much of an electronic device hacker and found this site surfing for an answer to a challenge I have. So, I joined in the hopes someone here can help.

I have an electronic dog training collar I want to extend the range on and have hit upon the idea of using a family radio service walkie talkie to do the task. Normally, the hand held transmitter for the dog collar works pretty well but as soon as my dog goes behind the garage, the signal get's cut way down and the collar won't work. And, of course, that's where my dog is misbehavin'. I've hooked up a IR video camera behind the garage and have a remote viewing LCD panel in the house. So far so good. The problem is that the dog collar won't work at that distance and with the garage in between me and the dog. So........

I've already modified the dog collar transmitter so that it has an external trigger port. A simple power jack into which I can insert the matching plug and by shorting the terminals, I close the circuit on the board inside and the remote transmits. It works fine and I can simply hang the transmitter behind the garage so it's nearer to my dog. Now all I have to do is figure out a way to remotely trigger it.

I have a spare Motorola walkie talkie that may do the trick. What I'm hoping to do is use the speaker output (by tapping into the headphone jack) to trigger a relay and close the external circuit I've wired up on the dog collar transmitter. It sounds simple, but I'm a bit over my head. I made a simple voltage measurement of the output when I call the Motorola walkie talkie using another walkie talkie and the voltage is stable at around 2.25 VDC. After I stop transmitting on the other WT, the voltage doesn't immediately drop but relatively slowly drops off to .1 VDC and then lower. (Not a distinct cut.)

So, is there any way to use this old walkie talkie to trigger a relay so that I can use another walkie talkie as a remote switch?

Or, is there a better way to go about it? I thought the walkie talkie idea had/has merit because of it's increased range.

Any help would be appreciated.

Thanks!
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Thu Sep 10, 2009 7:44 pm    Post subject: Reply with quote

Sorry for the delay in response, I somehow didn't see it the first time. You could use a voltage comparator to detect the voltage that you are talking about and either use a transistor or relay to activate the circuit.
http://en.wikipedia.org/wiki/Comparator
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