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This circuit uses a 555 timer as the bases of the touch switch. You can learn more about 555 timers in the Learning section on my site. When the plate is touched the 555 timer is triggered and the output on pin 3 goes high turning on the LED and the buzzer for a certain period of time. The time that the LED and the buzzer is on is based on the values of the capacitor and resistor connected to pin 6 & 7. The 10M resistor on pin 2 causes the the circuit to be very sensitive to the touch.

An ordinary AC switchboard contains separate switches for switching ‘on’/’off’ electric bulbs, tube lights, fans, etc. A very simple, interesting circuit presented here describes a feather-touch switchboard which may be used for switching ‘on’/‘off’ four or even more devices. The membrane or micro-switches (push-to-on type) may be used with this circuit, which look very elegant. By momentary depression of a switch, the electrical appliance will be ‘on’/‘off’, independently. To understand the principle and de-sign of the circuit, let us consider an existing switchboard consisting of four switches. One live wire, one neutral wire, and four wires for four switches are connected to the switchboard, as shown in the illustration below the circuit diagram. Feather-Touch Switches For Main Circuit diagram: Feather Touch Switches For Main Circuit Daigram The switches are removed and the above-mentioned wires (live, neutral, L1, L2, L3, and L4) are connected to the circuit, as shown in the main ...

China has confirmed that the new iPhone will get the touch sensitivity display. Rumors that Apple is going to take advantage of the iPhone touch sensitivity displays Force Touch, been around for a long time. Now Asian insiders are willing to share a new piece of information: the Chinese company TPK expected by the end of this year, a significant increase in profits, which will be primarily associated with the delivery of a large number of displays Force Touch for Apple. According to sources, Apple plans to use these displays in smartphones already starting with the iPhone 6S Plus. At the moment, she applies them in hours Apple Watch, but the production of 5.5-inch displays will cost Apple 2.5 times more expensive (the price of the sensor will be $ 13-14). IPhone 6S model references in association with displays Force Touch not, so it's possible that sensitive to the levels of pressing the screen will be a distinctive feature is iPhone 6S Plus. Apple already uses Force Touch, which i...

Description 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.  Circuit Diagram Parts Part Total Qty. Description Substitutions R1 1 10 Meg 1/4W Resistor R2 1 47K 1/4W Resistor R3 1 120k 1/4W Resistor R4 1 470 Ohm 1/4W Resistor C1 1 15uF Electrolytic Capacitor D1 1 1N4007 Silicon Rectifier Diode Q1 1 2N5458 N Channel Field Effect Transistor Q2 1 2N2222 NPN Transistor 2N3904 Q3 1 2N3906 PNP Transistor K1 1 Relay w/12V Coil, Contacts To Suit Application MISC 1 Board, Wire, Small Metal Pad For Touch Pad Notes The touch pad can be most...

This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits.  It can support a cable length of about 2500 feet.  A typical remote switch circuit is also shown as well as a receiver circuit for those switches. 12V Touch Switch Exciter Circuit Diagram Source: DiscoverCircuits