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Three sirens in one Circuit – Circuit Schematic
Three sirens in one Circuit
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Electronic Siren – Circuit Schematic
Electronic Siren
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Power supply failure alarm circuit – Circuit Schematic
Power supply failure alarm circuit
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Laser Barrier Detector – Circuit Schematic
Laser Barrier Detector
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Fridge Door Alarm Circuit – Circuit Schematic
Fridge Door Alarm Circuit
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3V Sweeping Siren Alarm – Circuit Schematic
3V Sweeping Siren Alarm
A very loud sweeping siren type audio sound generator powered by 3v. The circuit uses a LTC1799 precision frequency generator from Linear Technology. A 74HC14 h...
DIY siren project – Circuit Schematic
DIY siren project
Since this is a DC circuit, how and where do the + vs. the - wires physically get connected to the circuit Where exactly do I connect all the grounds to I under...
Phone Tap circuit – Circuit Schematic
Phone Tap circuit
In this file is a schematic for a simple wiretap & instructions for hooking up a small tape recorder control relay to the phone line. First, I will discuss taps...
Headlight Alarm Circuit – Circuit Schematic
Headlight Alarm Circuit
The most outrageous option would be to provide power via a battery pack. A more likely source would be the car`s battery. However, since the circuit`s goal is t...
How to Protect Your Door with High Voltage – Circuit Schematic
How to Protect Your Door with High Voltage
In this article, I`ll show you how to create a simple yet effective way of scaring off intruders. Of course, there are methods around this approach, but it`s gr...
Mini Alarm Circuit Schematic – Circuit Schematic
Mini Alarm Circuit Schematic
This circuit, enclosed in a small plastic box, can be placed into a bag or handbag. A small magnet is placed close to the reed switch and connected to the hand ...
Laser alarm circuit – Circuit Schematic
Laser alarm circuit
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Electronic door code lock – Circuit Schematic
Electronic door code lock
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Light circuit diagram: Intelligent Electronic Lock – Circuit Schematic
Light circuit diagram: Intelligent Electronic Lock
This intelligent electronic lock circuit is built using transistors only. To open this electronic lock, one has to press tactile switches S1 through S4 sequenti...
Earthquake alarm circuit schematic – Circuit Schematic
Earthquake alarm circuit schematic
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Alarm circuit – Circuit Schematic
Alarm circuit
This is Fire Alarm using IC TD2002 suite, to identify if there is a fire. This alarm is very important in crowd residential complex, so that we can know earlier...
Emergency Siren Simulator using 2N4401 and 2N4403 – Circuit Schematic
Emergency Siren Simulator using 2N4401 and 2N4403
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3904 3906 Siren Circuit – Circuit Schematic
3904 3906 Siren Circuit
3904 3906 Siren Circuit. The circuit produces a wailing siren sound when the switch is turned on.....
Mark Harrington 3 in 1 Door Bell – Circuit Schematic
Mark Harrington 3 in 1 Door Bell
Mark Harrington 3 in 1 Door Bell. The circuit comprises the power supply which is formed by TR1, Q3 , D13 , Q1 , D9.....
PIC16F628 2 Input Alarm Circuit – Circuit Schematic
PIC16F628 2 Input Alarm Circuit
The program uses the internal 4MHz oscillator PIC16F628 2 Input Alarm Circuit.....