Tact Switch 2 Circuit

This article introduces the circuit diagram is light touch switch  2. The circuit is not new, but it proved so useful, simple and cheap, worth building. A touch switch is a switch is turned on and off by touching a line contact, as opposed to open the bar like a normal switch. Touch switch no mechanical parts wear, so they last longer than a normal switch. Will touch switch can be used for ordinary switch places for a long time, such as wet or dusty areas. In the circuit: contact a just two laps line tightly, or two squares etching closely in the PC board. When activated, the output of the circuit is about 1 second. The pulse can be used to drive the relay, transistors and other logic, etc. You can have different length of the output pulse by using smaller or larger capacitor C1. The circuit is very simple, hope to help you. 

 

Schematic

Parts

Part	Total Qty.	Description	Substitutions
C1	1	10uF 16V Electrolytic Capacitor
R1, R2	2	100K 1/4 Watt Resistor
R3	1	10 Meg 1/4 Watt Resistor
U1	1	4011 CMOS NAND Gate IC
MISC	1	Board, Wire, Socket For U1

 

 

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