Laser Beam Alarm
This Alarm can be used to protect your property, Inside or Outside.
And it can protect a Very Large area such as the complete perimeter of your yard.
Be Aware...
Laser Beam Alarm
This Alarm can be used to protect your property, Inside or Outside.
And it can protect a Very Large area such as the complete perimeter of your yard.
Be Aware...
Door lock Circuit
This circuit can be used to operate an electric strike or an electromagnetic lock on a door. It is not the door being opened/closed, but a small electromagnetic...
Door lock Circuit
This circuit can be used to operate an electric strike or an electromagnetic lock on a door. It is not the door being opened/closed, but a small electromagnetic...
Electronic Keypad
The alarm will switch off when the 4 keys connected to "A,B,C,D" are pushed in the right order.The circuit works because each gate `Stands` upon its predecessor...
Electronic Keypad
The alarm will switch off when the 4 keys connected to "A,B,C,D" are pushed in the right order.The circuit works because each gate `Stands` upon its predecessor...
Self-powered Doorbell
This very simple and self-powered device was conceived to allow a person to monitor if someone has rung his home door-bell when he was out.
As most door-bells ...
Self-powered Doorbell
This very simple and self-powered device was conceived to allow a person to monitor if someone has rung his home door-bell when he was out.
As most door-bells ...
DIAL ALARM-1
This is the lowest cost dialing alarm on the market and shows what can be done with an 8-pin microcontroller. The complete circuit is shown below. You cannot se...
DIAL ALARM-1
This is the lowest cost dialing alarm on the market and shows what can be done with an 8-pin microcontroller. The complete circuit is shown below. You cannot se...
Simple Magnetic Contact Alarm Project
The circuit shown below is a basic latching circuit consisting of a quad 2-input NAND Gate IC. It is configured such that the flip flop circuit U1A and U1B has ...
Simple Magnetic Contact Alarm Project
The circuit shown below is a basic latching circuit consisting of a quad 2-input NAND Gate IC. It is configured such that the flip flop circuit U1A and U1B has ...
Video Clock Superimposer
As a followup to my VCR Pong project, here is a gadget that is actually useful in the Real World! It superimposes the time of day, in "HH MM SS" format, in the ...
Video Clock Superimposer
As a followup to my VCR Pong project, here is a gadget that is actually useful in the Real World! It superimposes the time of day, in "HH MM SS" format, in the ...
Wire Loop Alarm
This circuit is a simple wire loop alarm that can be used in doorways, hallways, or any other place the tripwire will be broken by intruders. The circuit has a ...
Wire Loop Alarm
This circuit is a simple wire loop alarm that can be used in doorways, hallways, or any other place the tripwire will be broken by intruders. The circuit has a ...
Water Level Alarm
A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level of water in a ba...
Water Level Alarm
A circuit that offers visual indication of fluid level in a vessel, with a switchable audible alarm. Example uses would be to monitor the level of water in a ba...
Water Activated Alarm
The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no ...
Water Activated Alarm
The circuit uses a 555 timer wired as an astable oscillator and powered by the emitter current of the BC109C. Under dry conditions, the transistor will have no ...