touch sensitive alarm circuit | Electronic Schematic Diagram https://electronicscheme.net Schematic Diagram & PCB Design Sat, 06 Sep 2014 13:03:58 +0000 en-US hourly 1 https://i0.wp.com/electronicscheme.net/wp-content/uploads/2017/05/cropped-transparent_text_effect.png?fit=32%2C32&ssl=1 touch sensitive alarm circuit | Electronic Schematic Diagram https://electronicscheme.net 32 32 129969089 Touch Switch https://electronicscheme.net/touch-switch/?utm_source=rss&utm_medium=rss&utm_campaign=touch-switch https://electronicscheme.net/touch-switch/#comments Thu, 03 Sep 2009 07:31:05 +0000 http://electronicscheme.net/?p=233 Turn on and turn off your electrical devices using touch switch, so you can “play” your electronic devices more fun.. 🙂 . Touch switch don’t […]

The post Touch Switch first appeared on Electronic Schematic Diagram.]]> Turn on and turn off your electrical devices using touch switch, so you can “play” your electronic devices more fun.. 🙂 . Touch switch don’t need mechanical part, so they will not worn out due to mechanical contact. Touch switches can be used in places where regular switches would not last, such as wet or very dusty areas. You just need to add some relay to switch your devices which require high voltage supply.

Here the touch switch schematic diagram:

Touch switch schematic

Components list:

Part      Total Qty.    Description

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


Touch Switch Circuit Notes:

  1. The contacts an be made with just two loops of wire close together, or two squares etched close together on a PC board.
  2. When activated, the output of the circuit goes high for about one second. This pulse can be used to drive a relay, transistor, other logic, etc.
  3. You can vary the length of the output pulse by using a smaller or larger capacitor for C1.

Just try touch switch circuit… 🙂

The post Touch Switch first appeared on Electronic Schematic Diagram.]]> https://electronicscheme.net/touch-switch/feed/ 4 233 Door Knob Touch Alarm https://electronicscheme.net/door-knob-touch-alarm/?utm_source=rss&utm_medium=rss&utm_campaign=door-knob-touch-alarm https://electronicscheme.net/door-knob-touch-alarm/#respond Sun, 09 Aug 2009 19:41:50 +0000 http://electronicscheme.net/?p=158 This is door knob touch alarm for your home security purpose. The alarm will be activated when someone touch the metal door knob. This circuit […]

The post Door Knob Touch Alarm first appeared on Electronic Schematic Diagram.]]> This is door knob touch alarm for your home security purpose. The alarm will be activated when someone touch the metal door knob. This circuit won’t work on full metal door.

Door Knob Touch Alarm circuit diagram

The supply power for this door touch alarm is 3V DC, two AA batteries can be used to operate this circuit to make this circuit portable. Since this circuit consumes very small power, the battery will be last very long. A variable resistor used to adjust the sensitivity of the touch.

Please read above schematic diagram and some notes on the image diagram first before assemble this circuit.

Download the schematic drawing

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