Touchsensor SSR anyone?..

[Svart]

A touchsensor solid state relay

a tidbit of schematic i layed out today at work when i got a little bored.. I have no idea if it works or not, I haven't proto'd it yet. I've used the touchsensors on a couple of projects and they are great. the sensitive triac/power triac setup I lifted from a motor control I designed, only it used SCRs instead.. this should work i think. just watch power dissipation on the triac. :wink:

I'll proto it in the next few days and get back to you...

http://www.geocities.com/noireclipse/touchsensor.JPG

i bet geocities has me shutdown in minutes but have fun..

http://www.qprox.com/products/touch.php
http://www.teccor.com/cgi-bin/r.cgi/index.html



:thumb:

 

[Rochey]

hey, they do a rotary sensor chip like the ipod...

and it's SPI.... (begins to think about digital mixers with ipod like interfaces.... digitally controlled mic preamps with touch pad interfaces...)


droooooooooooooooooooooooooooooool


Wait... I can't even get to completion on a basic project, nevermind the fun stuff like this!

bugge.r....

 

[Svart]

yeah they have some nice stuff these days.

guess no one was interested.. good! now i have an edge on my DIY!

:green: My DIY is better than your DIY HA! :green:

ha ha ok just kidding.

too many :guinness: :guinness: tonight i think... off to bed!

:thumb:

 

[Svart]

guess it's not a helpful idea..

oh well back to the drawing board..

 

[daArry]

Hey,

Sounds good ye :thumb:

I know there was interest over at midibox - check this recent thread: http://70.84.40.25/forum/index.php?topic=3839.0

I see SPI interface mentioned so intergration to MIOS should be pretty painless...

 

[BYacey]

If you are switching mains voltage, I would use an optocoupler between the control circuit and the triac. If anything ever shorted, there could be lethal potentials sitting on the touchplate.

 

[gang of elk]

not to side-track, but speaking of cool touch sensor interfaces..this thing looks cool.

http://www.jazzmutant.com/lemur_overview.php

 

[Svart]

those panels are pretty nice looking. I'm sure they probably use these sensor ICs too.

as for mains voltage, if for any reason the gates were to fuse to the line input you could get line voltage back to the output of the sensor, however the sensor is actually a RISC processor with ADC/DAC i/o, so it's doubtful that you could/would get mains on the touchplate. it would most likely smoke the IC completely open.. as for the touchplate, this sensor is designed to be used behind dielectric panels like glass or plastic. you *could* use the touchplate as a bare surface but it's designed to have some kind of covering, so when used as designed you would never touch the plate anyway. Failure modes of triacs usually don't include the gate fusing to the anode or cathode, rather the diode portion fuses closed causing the circuit to stay on.

just a thought based on observation, but yes usually designers add the extra security of an optoisolator just to minimize the damage done to other parts of the circuit when certain parts let out the factory smoke.

:thumb: