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Simple bicycle alarm – Circuit Schematic
Simple bicycle alarm
The switch has been mounted inside the tap of the handlebar. I`ve make the battery holder out of an old flashlight. As you can see in the video in step 1, i`ve ...
Reverse Engineering an Electric Fence Charger – Circuit Schematic
Reverse Engineering an Electric Fence Charger
This product includes some logic circuitry used to control the timing of the output pulses, which will be discussed in a later step.  The logic circui.....
CUSTOMIZE YOUR DOORBELL – Circuit Schematic
CUSTOMIZE YOUR DOORBELL
It is very important to know about the pins of the IC in order to build the circuit. 1GND - Ground, low level (0 V) 2 TRIG -. One day i went to my friends house...
Laser Trip Mine – Circuit Schematic
Laser Trip Mine
This instructable will teach you how to make a laser trip mine. If someone steps in the lasers path I have gotten it to set off a L.E.D., but you can.....
Laser Perimeter Alarm – Circuit Schematic
Laser Perimeter Alarm
Learn how to fortify your fortress no matter what the size with this ingenious myriad of a customizable laser grid. Once someone steps through and bre.....
LASER BURGLAR ALARM – Circuit Schematic
LASER BURGLAR ALARM
Hi guys..!!this is my 1st easy cheap n simple instructabel u need following components for laser burglar alarm-1. LDR or photocell 2.printed circui.....
Intruder Sentinel – Circuit Schematic
Intruder Sentinel
Tired of always being snuck up upon? Doing any stealth surveillance or reconnaissance? Or maybe you just need to set-up a fail-safe alarm for your stu.....
SPY 5000 two-way motorcycle alarm into a Honda 1998 CB250 Nighthawk – Circuit Schematic
SPY 5000 two-way motorcycle alarm into a Honda 1998 CB250 Nighthawk
This Instructable describes the installation of a SPY5000 two way motorcycle alarm with a Honda 1998 CB250 Nighthawk motorcycle. This Alarm is rat.....
FM Bug Detector Kit – Circuit Schematic
FM Bug Detector Kit
This is for all the spies/paranoid people out there. An essential piece of equipment for any spy is an Electronic Bug Detector. You never know what go.....
ETest buzzer and SCR – Circuit Schematic
ETest buzzer and SCR
After soldering in the components highlighted in the circuit diagram, it is time for a quick check. I used 3 volts from a couple of AA cells for this.....
pulse mode motion detector – Circuit Schematic
pulse mode motion detector
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TYN612 SENSITIVE & STANDARD(12A SCRs) – Circuit Schematic
TYN612 SENSITIVE & STANDARD(12A SCRs)
Circuit The circuit diagram of window foil burglar alarm has been published here. The main parts of this circuit are SCR H1 (TYN 612) and transistor Q1 (BC 107)...
Touch Switch Activated Relay – Circuit Schematic
Touch Switch Activated Relay
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Low voltage warning beeper circuit with CA3160 – Circuit Schematic
Low voltage warning beeper circuit with CA3160
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How to build Room Noise Detector Circuit Schematic – Circuit Schematic
How to build Room Noise Detector Circuit Schematic
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Electronic dog repellent dog chaser schematic – Circuit Schematic
Electronic dog repellent dog chaser schematic
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Audio Memo Alert Circuit – Circuit Schematic
Audio Memo Alert Circuit
This device prevents paper notes and memos from being overlooked. A paper note placed between two fingers made of a conducting material (metal or conductive pla...
Wire Loop AlarmCircuit Project – Circuit Schematic
Wire Loop AlarmCircuit Project
The loop can be any type of hookup wire, with a maximum resistance of about 90K. Using very thin wire (40AWG, for example) will make a very sensitive trip wire,...
Water Level AlarmCircuit Project – Circuit Schematic
Water Level AlarmCircuit Project
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Ultrasonic Radar AlarmCircuit Project – Circuit Schematic
Ultrasonic Radar AlarmCircuit Project
As it has already been stated the circuit consists of an ultrasonic transmitter and a receiver both of which work at the same frequency. They use ultrasonic pie...