May 1, 2005 #1 raywootnc Mechanical Apr 7, 2005 9 I need a sensor that could be powered by direct current. When the sensor is touched it deactivates an alarm which is on the same circuit.
I need a sensor that could be powered by direct current. When the sensor is touched it deactivates an alarm which is on the same circuit.
May 1, 2005 #2 TurboXS Electrical Mar 17, 2005 95 We need a few more details of your requirement. If you mean a touch switch where you touch two conductive contacts then this can be done using CMOS logic which can then be used to switch (electronically or via a relay) your alarm circuit. For example; http://www.aaroncake.net/circuits/touch.htm (not necessarily a good one, just one I found in a quick search) If you have other requirements such as no exposed contacts then you may want to look at capacitive switches such as; http://www.telecom.globalsources.com/MAGAZINE/EC/0302W1/NP0214_G.HTM Your requirements will help narrow down the choice. regards Pete (TurboXS) Upvote 0 Downvote
We need a few more details of your requirement. If you mean a touch switch where you touch two conductive contacts then this can be done using CMOS logic which can then be used to switch (electronically or via a relay) your alarm circuit. For example; http://www.aaroncake.net/circuits/touch.htm (not necessarily a good one, just one I found in a quick search) If you have other requirements such as no exposed contacts then you may want to look at capacitive switches such as; http://www.telecom.globalsources.com/MAGAZINE/EC/0302W1/NP0214_G.HTM Your requirements will help narrow down the choice. regards Pete (TurboXS)
