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.
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
Guitar Synthesizer Schematic Diagram In this post, we provide a collection of schematic diagrams of…
Handy Talky Schematic Diagram This is an old electronic scheme of the Handy Talky (HT)…
This is an old or "very old" schematic diagram of birdie tone or sound generator.…
Here is the 200W MOSFET amplifier powered based on four piece of IRFP250N, they are…
This is the 300W RMS stereo power amplifier circuit project. This amplifier is based four…
This is an active stereo tone control circuit using very well known op-amp IC of…