I'll be using a 7805 to regulate the power down to 5v for the qt113 and for a fan. Everything else will run off the 12v =] Yeah, I'm probably going to buy the dip version since I hate going cross eyed when soldering stuff, learned my lesson with SMD leds xD.
Just so you know, if you are going to buy from that Saelig company you will probably want them to give you a shipping quote for shipping via USPS. When you go through the checkout on their site it only give you the option of Fedex or UPS which are bloody expensive.I emailed them and they are going to give me a quote on USPS shipping. Although I will be having it shipped to the US and not Canada but USPS is much cheaper.
Just a quick comment I've done a little with these touch sensors and the output will require a rather sizable CAP to reduce the "chatter" or pulsing of the output. It's a "HeartBeat" the QT's produce to validate (or test) that they are functional. What happens is the transistor will saturate - turn on then bounce (depending on the sensitivity of the trans or it's saturation point). So frustrated I was with this happening (led's/motors pulsing) that with all of my qt circuits I ended up simply throwing a relay. Had my circuit checked and verified by Quantum. This was with the 113/118 specifically I imagine a proper mosfet is the answer but if you start having erratic output when the qt is high then you might be experiencing similar. The datasheet circuit to eliminate the pulsing did not work for me but I'm merely a grasshopper in the DC circuitry world. I ran for the simple solution - a relay (read expensive) so in essence the qt just throws the relay coil and still requires smoothing to keep the coil fully engaged. Please post up a finished schema if your efforts are successful.
I have a stable output from my QT113. I have it set on toggle mode. It outputs either 0V or 4.9V. Works perfect for me.
That's nice! Are you pushing 5v or 12v systems I did'nt have trouble until powering 12v using the QT's output to the base of a transistor switching 12v. Mentioned it was likely my part selection (of transistors) how about a nice schema for pushing 12v via a transistor now that would be helpful! Got notice today that the 113/118's are NLA
I used my QT113 to turn on and off my case lights which are powered by 12V. If that is what you are trying to do, head on over to that QT110 guide to the last page when I finally got it working. Sort of a schematic type diagram thingy there. Hopefully its helpful. As for where to get them you can still get them at www.saelig.com along with many different versions.
