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Help for a newbie - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2010 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

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Post subject: Help for a newbie Posted: Fri Oct 14, 2005 10:28 am


Joined: Fri Oct 14, 2005 10:05 am

Posts: 1

Let me start by saying I have minimal experience with electronics, I have a Electronics degree from ITT (please.. no laughing) of which I haven't used any of the knowledge in 7 years. If you find this isn't the appropriate place for this question or isn't the appropriate site please point me in the correct direction (before or after you flame me.. your choice ).

I have the need for a transmitter that is triggered on a small input voltage (< .5V) the transmitter will need to transmit < 20 feet (usually no more than 5 feet) and trigger a reciever that will send an output of .5V. What is transmitted doesn't matter (to me anyway). I will have multiple transmitter/receiver combos in the same location so I will need mutlple frequencies. I don't know if this is to much to do for a novice or if this is something simple and I am just skipping past the solution. If this is something to simple for a novice is there somewhere I can go to try and find designers?


Travis Williams



Post subject: Posted: Fri Oct 14, 2005 11:43 am


Joined: Mon Jul 18, 2005 4:31 pm

Posts: 32

Location: Baltimore, MD

Hard to offer you a good solution since you haven't mentioned the application, but I suggest you look into circuits and ICs made for handling car Remote Keyless Entry systems (RKE) or garage door opener transmitters. Either of those will be great for your application... probably even more than you need.



Post subject: Posted: Fri Oct 14, 2005 12:03 pm

Is there a common place to go to to look for people who do circuit design for profit? I see a lot of big companies that say they do it and spread the cost out during the ordering of the circuit.. but we are kind of in a proof of concept phase and don't really want to incur a lot of cost for something that isn't going to work the way we want anyway.





Post subject: Posted: Thu Oct 20, 2005 2:38 am


Joined: Mon Sep 26, 2005 7:29 pm

Posts: 13

Kanlings suggestion was a pretty good one. With the concept of garage door openers, you could have multi RX/TX units, with each having a seperate code. The coding would allow you to do what ever it is you need multi RX/TX units for.

As far as designing from scratch, I think you would be in over your head, and a design person would cost you some serious money. If you are serious about hiring someone, perhaps you could call one of the garage opener companies, and ask them if they could take an existing product and just add the changes which would fit your application.

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