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Delayed Car Door Alarm – Circuit Schematic
Delayed Car Door Alarm
Opening car`s door is very simple activity, and off course it`s just a daily activity which require no special skill. Almost nothing can go wrong, but.....
First-Response Monitor with SCR (Quiz Alarm) – Circuit Schematic
First-Response Monitor with SCR (Quiz Alarm)
A pair of cross-coupled SCRs can be used to build a first-response monitor circuit, as shown in the schematic diagram below.  First-response circuit is.....
Phone Incoming Call Flasher – Circuit Schematic
Phone Incoming Call Flasher
This is a circuit of phone message flasher, an alternative way to get alarmed when there is an incoming call. When the phone rings, high line voltage will be.....
Burglar Alarm Works for Both N.O and N.C Contacts – Circuit Schematic
Burglar Alarm Works for Both N.O and N.C Contacts
Unlike other alarm circuit that provide normally-open only or normally-closed only configuration, this alarm circuit work for both configurations. The.....
Temperature Alarm with Op-Amp Comparator – Circuit Schematic
Temperature Alarm with Op-Amp Comparator
The circuit below is configured as a comparator. A fixed reference voltage at the non inverting input is provided by R1 and R2. The inverting input voltage is.....
555 IC Water Level Sensor/Detector Alarm – Circuit Schematic
555 IC Water Level Sensor/Detector Alarm
This schematic diagram below shows a 555 IC water level sensor/detector alarm circuit. This circuit is powered through the emitter current of the BC109C. 555 ti...
Fastest Quiz Bell/Alarm – Circuit Schematic
Fastest Quiz Bell/Alarm
This is aquiz bell/alarm circuit. This circuit indicate fastest finger first . This circuit has one bulb for Quiz master and one for each contestant. The bulb...
Max454 Video Switcher – Circuit Schematic
Max454 Video Switcher
Installing the camera in office, home, or the shop becomes economically feasible because the price of security camera going down. It is not efficient if we.....
Max454 Video Switcher – Circuit Schematic
Max454 Video Switcher
Installing the camera in office, home, or the shop becomes economically feasible because the price of security camera going down. It is not efficient if we.....
Dual Tone Single IC Siren – Circuit Schematic
Dual Tone Single IC Siren
This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles,.....
Dual Tone Single IC Siren – Circuit Schematic
Dual Tone Single IC Siren
This circuit is a double tone Police sound and Single tone old ambulance sound. This circuit is usually installed on a on battery powered cars, motorcycles,.....
Wailing Alarm Siren – Circuit Schematic
Wailing Alarm Siren
This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3.....
Wailing Alarm Siren – Circuit Schematic
Wailing Alarm Siren
This alarm siren circuit give continuous frequency sweep, a warbling sound. The warbling period is about 6 seconds, 3 seconds for frequency sweeping up and 3.....
Electronic safety-lock with telecars as key – Circuit Schematic
Electronic safety-lock with telecars as key
Most of the source code of this project its based on my Telecard reader projectof my web site. The components for this project arefew and ordinary, thatmeans lo...
Electronic safety-lock with telecars as key – Circuit Schematic
Electronic safety-lock with telecars as key
Most of the source code of this project its based on my Telecard reader projectof my web site. The components for this project arefew and ordinary, thatmeans lo...
The medical electric aspirator waterproof controller (2) – Circuit Schematic
The medical electric aspirator waterproof controller (2)
Working principle of the circuitThis medical electric aspirator waterproof controller consists of the power supply circuit, liquid level detection control circu...
The medical electric aspirator waterproof controller (2) – Circuit Schematic
The medical electric aspirator waterproof controller (2)
Working principle of the circuitThis medical electric aspirator waterproof controller consists of the power supply circuit, liquid level detection control circu...
Telephone electronic coded lock circuit – Circuit Schematic
Telephone electronic coded lock circuit
Telephone electronic coded lock circuit is shown as above,the electronic coded lock is suitable for double audio circuits.After the phone adds this coded lock, ...
Telephone electronic coded lock circuit – Circuit Schematic
Telephone electronic coded lock circuit
Telephone electronic coded lock circuit is shown as above,the electronic coded lock is suitable for double audio circuits.After the phone adds this coded lock, ...
Micro vibration sensor alarming circuit diagram – Circuit Schematic
Micro vibration sensor alarming circuit diagram
This circuit includes micro vibration sensor, trigger delay circuit and control circuit, the figure is as shown. The micro vibration sensor contains vibration s...