Simple Touch Switch Circuit

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Similar to the CMOS based Touch Switch also on this site, this transistor based touch switch can activate a load simply by the user touching a metal plate. It is designed to directly switch a relay to allow it to be used with large loads. As it uses only a few commonly available transistors and a 12V supply, it is ideal for hostile environments where mechanical switches would be damaged. Using a latching relay and two of these circuits, a simple two pad "touch on/touch off" arrangement can be made.

Schematic

Schematic for touch switch

Parts
Part
Total Qty.
Description
Substitutions
R1110 Meg 1/4W Resistor
R2147K 1/4W Resistor
R31120k 1/4W Resistor
R41470 Ohm 1/4W Resistor
C1115uF Electrolytic Capacitor
D111N4007 Silicon Rectifier Diode
Q112N5458 N Channel Field Effect Transistor
Q212N2222 NPN Transistor2N3904
Q312N3906 PNP Transistor
K11Relay w/12V Coil, Contacts To Suit Application
MISC1Board, Wire, Small Metal Pad For Touch Pad

Notes

  1. The touch pad can be most easily made by cutting a small square of PCB material and then soldering on a single wire. Alternatively, something like a penny glued to a plastic backing will do the job.

  2. As mentioned, a latching relay can be used so that a momentary touch activates the relay and it remains active. To turn off a latching relay, power must be interrupted. So a 2nd circuit with a normal relay can be used to cut power (use the NC contacts on the 2nd circuit). Placed side by side, two touch pads form an "on" and an "off" pad.

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Comments
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manolo
Simple Touch Switch help
Thursday, March 18, 2010 1:43:10 PM
i have all the pieces but i don't know how to put them together how to know how the transistors go, i mean, in what orientation and the most important the relay i have has 5 input/output how to put it in the right order im new at this so explain like if i were retarded
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