Cheap Bicycle Alarm Schematics
The author wanted a very cheap and simple alarm for some of his possessions, su…
Thursday, September 17, 2020
Showing posts with label Alarm. Show all posts
Showing posts with label Alarm. Show all posts
Simple Door Alarm
This circuit emits a beep and/or illuminates a LED when someone touches the doo…
Tuesday, September 15, 2020
Car Anti-Theft Wireless Alarm
This FM radio-controlled anti-theft alarm can be used with any vehicle having 6…
Saturday, September 5, 2020
Power Supply Failure Alarm
Most of the power supply failure indicator circuits need a separate power-suppl…
Friday, August 28, 2020
Four-in-One Burglar Alarm
In this circuit, the alarm will be switched on under the following four differe…
Saturday, August 22, 2020
Long-Range Cordless Burglar Alarm
This long-range cordless burglar alarm circuit makes use of a cordless telephon…
Friday, August 21, 2020
Make a General-Purpose Alarm
How to make a general-purpose alarm. The alarm may be used for a variety of app…
August 21, 2020
Automatic Night Lamp with Morning Alarm
This circuit automatically turns on a night lamp when bedroom light is switched…
Wednesday, August 19, 2020
Mains Failure Alarm
This circuit was designed to produce an audible alarm when the mains power is i…
Tuesday, August 4, 2020
Drinking Water Alarm Using by IC LM555
The State Jal Boards supply water for limited duration in a day. Time of water …
Friday, July 31, 2020
Low-Cost Power Buzzer
How often on average do you have to call members of your family each day to tel…
Thursday, July 30, 2020
Tandem Doorbell
The author had a problem: the neighbours had exactly the same type of doorbell…
Wednesday, July 29, 2020
Simple Gated Alarm
Sometimes the need arises for a simple, gated, pulsed alarm. The circuit shown …
Tuesday, July 28, 2020
Broken Charger Connection Alarm
Detects if a device is not properly connected to its supply Suitable for batter…
Sunday, July 26, 2020
Pyro Electric Fire Alarm
Here is an ultra-sensitive fire sensor that exploits the direct piezoelectric p…
Wednesday, July 22, 2020
Best Automatic Car Alarm
Even the best car alarm is useless if you forget to set it upon leaving your ca…
Monday, July 20, 2020
Car Alarm Sound Booster
For car alarms, emphasis should be put on hearing the audible alert and identif…
Friday, July 10, 2020
Fire Alarm Using Thermistor
In this fire alarm circuit, a thermistor works as the heat sensor. When tempera…
Friday, June 26, 2020
Simple Motorbike Alarm
This simple to build alarm can be fitted in bikes to protect them from being st…
Wednesday, June 24, 2020
Simple Current Monitor and Alarm
These circuits are intended for remote monitoring of the current consumption on…
Monday, June 22, 2020
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