Advertisement
Room Noise Detectors – Circuit Schematic
Room Noise Detectors
This circuit is intended to signal through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed levels, namely 50, 70 & 85 ...
UltraSonic Radars – Circuit Schematic
UltraSonic Radars
This is a very interesting project with many practical applications in security and alarm systems for homes, shops and cars. It consists of a set of ultrasonic ...
Remote Doorbell Warning Switchs – Circuit Schematic
Remote Doorbell Warning Switchs
The hardest part for this circuit was the title. It is quite easy to miss the sound of a doorbell if you are watching TV, this circuit gets round the problem by...
High Voltage Stun Guns – Circuit Schematic
High Voltage Stun Guns
This device produces high voltage pulses discrupting muscles and nervous sYstem, leaving anyone who touches it in a state of menthal confusion. Can be used agai...
High And Low Voltage Cut Off With Time Delays – Circuit Schematic
High And Low Voltage Cut Off With Time Delays
The under/over voltage protection circuit with time delay presented here is a low cost and reliable circuit for protecting such equipments from damages.....
Downed Model Locator IIs – Circuit Schematic
Downed Model Locator IIs
...
Receiver Battery Low Voltage Alarms – Circuit Schematic
Receiver Battery Low Voltage Alarms
...
Precision Receiver Battery Low Voltage Alarms – Circuit Schematic
Precision Receiver Battery Low Voltage Alarms
Flying hand launch gliders means living with small capacity receiver NiCad battery packs. These small packs are light, but have the distinct disadvantage of rap...
Downed Model Locators – Circuit Schematic
Downed Model Locators
...
Economy radar detectors – Circuit Schematic
Economy radar detectors
This circuit uses a 1458 dual op-amp to form a radar detector. C1 is the detector of the radar signal. The first op-amp forms a current-to-voltage converter and...
Keys Finders – Circuit Schematic
Keys Finders
...
Motorcycle Alarm – Circuit Schematic
Motorcycle Alarm
...
Electronic Doorbell with Counter – Circuit Schematic
Electronic Doorbell with Counter
This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a ""ding-dong"" chiming doorbell. Additionally, the circuit in...
Hacking an alarm clock – Circuit Schematic
Hacking an alarm clock
We will bypass the mechanical snooze switch on top, and instead turn the alarm clock off in a much more fun way: punching it! Hopefully along the way I will be ...
siren circuit – Circuit Schematic
siren circuit
This circuit will generate siren sound when S1 pressed and increate sound frequency becuase capacitor C1 charged when switch S1 released the frequency will decr...
5 Zone Anti TheftCircuit Based On The CMOS 4050B IC – Circuit Schematic
5 Zone Anti TheftCircuit Based On The CMOS 4050B IC
The following circuit shows about 5 Zone Anti Theft Circuit Diagram. This circuit Based On The CMOS 4050B IC. Features: system may comprise in .....
Easy Alarms Police / Ambulance Electronic – Circuit Schematic
Easy Alarms Police / Ambulance Electronic
The following circuit shows about Alarms Police / Ambulance electronic Diagram Design. Features: simple and easy to assemble, Cheap circuit, .....
Ne7555 Timer For Light Sensitive Alarm Sensor – Circuit Schematic
Ne7555 Timer For Light Sensitive Alarm Sensor
This circuit shows about Ne7555 Timer For Light Sensitive Alarm Sensor Circuit Diagram. Features: detects a sudden shadow falling on the .....
12-volt Modular Burglar Alarm Sensor – Circuit Schematic
12-volt Modular Burglar Alarm Sensor
The following circuit shows about 12-volt Modular Burglar Alarm Sensor Circuit Diagram. Features: a timed Bell Cut-off., automatic Exit and Entry .....
BC 547 Transistor For Garage Alarm Sensor – Circuit Schematic
BC 547 Transistor For Garage Alarm Sensor
The following circuit shows about BC 547 Transistor For Garage Alarm Sensor Circuit Diagram. Features: simple single-zone burglar alarm circuit, .....