Water Activated Sensor Alarm Using 555 PCB
The circuit comprises a 555 IC as the core. This is designed to work as an astable multivibrator. When we connect a positive 9 volt to pin no. 8, the circuit wi...
Infrared Burglar Alarm Using Remote control PCB
There are so many circuits available for infrared Burglar alarm but transmitter section of these burglar alarm circuits are complicated and you may have assembl...
Door Bell Circuit Using BEL 188 PCB
Circuit Here is a low cost one touch door bell circuit using Bel 188 transistor. I think this may be the most cheap bell circuit that can be made. The core of t...
Alarm Digital Clock-DS1307
DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which show...
Zone Alarm System
At switch on, C6 will charge via R11, this acts as the exit delay and is set to around 30 seconds. This can be altered by varying either C6 or R11. Once the tim...
Simple Burglar Alarm circuit
This is a simple single-zone burglar alarm circuit. Its features include automatic Exit and Entry delays and a timed Bell/Siren Cut-Off. It`s designed to be use...
Water Level Alarm
This circuit will trigger with any fluid with a resistance under 900K between the maximum separation distance of the probes. Let me explain further. The circuit...
Simple fire alarm circuit using IC timer NE555
Here the simple file alarm circuit based timer ID NE555. The works is simple, the lamp give light to the LDR (Light Depending Resistor) as light sensor. When th...
Motorcycle Alarm PCB
This circuit features an intermittent siren output and automatic reset. It can be operated manually using a key-switch or a hidden switch; but it can also be wi...
Digital Ber-password circuit
Circuit Kunci Digital Ber-password is the circuit diagram of a simple electronic combination lock usingLS 7220. Circuit Kunci Digital Ber-password Password Digi...
Watch-Dog For Telephones
Most of the telephone security devices available in market are simple but quite expensive. These devices provide blinking or beeping type line-tap/misuse indica...
Time Switch
This circuit is especially designed for those who often need to wake up early in the morning. Ordinary alarms in electronic watches are not loud enough and very...
Shoo Dog !
We`ve all had occasion to be annoyed at inconsiderate dog owners whose animals relieve themselves on the private property of others. This problem can hardly be ...
Non-Contact Power Monitor
Here is a simple non-contact AC power monitor for home appliances and laboratory equipment that should remain continuously switched-on. A fuse failure or power ...
drinking water alarm schematics
The State Jal Boards supply water for limited duration in a day. Time of water supply is decided by the management and the public does not know the same. In suc...
Clap Switch circuit diagram
Here`s a clap switch free from false triggering. To turn on/off any appliance, you just have to clap twice. The circuit changes its output state only when you c...
Automatic Heat Detector
This circuit uses a complementary pair comprising NPN metallic transistor T1 (BC109) and pnp germanium transistor T2 (AC188) to detect heat (due to outbreak of ...
Schematic Diagram Anti Theft Car wireless alarm
This is anti theft alarm with wireless connectivity, called Anti Theft Car wireless alarm The FM radio-controlled anti- theft alarm can be used with any vehicle...
Power Buzzer
How often on average do you have to call members of your family each day to tell them that dinner is ready, it`s time to leave, and the like The person you want...
Isolated Fuse Fail Indicator
This circuit uses standard components and shows a method of indicating the fuse status of mains powered equipment while providing electrical isolation from the ...