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Sound Trigered Camera flash – Circuit Schematic
Sound Trigered Camera flash
If you wish to take a picture of a fleeting event which generates a sound, you can do it with this sound activated trigger. It does not require any power supply...
Advanced Electronic Siren – Circuit Schematic
Advanced Electronic Siren
Voltage is applied to the chip via pins 14 and 7 so that when power is applied to the project, the high and low frequency oscillators will come into operation t...
RF Bug detector – Circuit Schematic
RF Bug detector
This circuit is not open for discussion. Although working perfectly, it was experimental. I will answer no emails in regards to this circuit. If you are lookin...
Keypad Combination Lock Relay – Circuit Schematic
Keypad Combination Lock Relay
Only one out of 9,999 possible codes has the power to unlock this simple, yet effective, electronic lock. A combination lock is not just a perfect system to pro...
Smartcard controlled Lock with Relay – Circuit Schematic
Smartcard controlled Lock with Relay
This design uses a smart card to enable a relay. A Nutchip recognizes its mating smart card among thousand similar ones, because you choose the code to be progr...
Announcer DoorBell – Circuit Schematic
Announcer DoorBell
M1 is a clamp connected to the 24V (dc or ac) power from the gate opener. The diode bridge rectifies the alternate voltage (should the opener use dc current, it...
RF wireless allarm magnetic switch PIC16F84 – Circuit Schematic
RF wireless allarm magnetic switch PIC16F84
This circuit was formed to create a wireless alarm from a normal magnetic contact. By fixing the magnet to the leaf of a door, or swing of a drawer, it is easy ...
Electric Fence circuit – Circuit Schematic
Electric Fence circuit
A circuit design, based on a C-mos chip to Drive a Car Ignition Coil. This is a Very Simple and Efficient Design for an Electric Fence. It puts out a Very high ...
Cat / Dog Detector – Circuit Schematic
Cat / Dog Detector
This can be used to control entry on a Cat or Dog Door" NOTE: There may be some changes and improvements coming. However this circuit does work and you can buil...
Door electronic lock with Keypad – Circuit Schematic
Door electronic lock with Keypad
It is a relatively simple circuit of electronic lock of safety with code of 7 digits. It should is given attention in the time that will be stepped the keys, th...
Limit Temperature Buzzer – Circuit Schematic
Limit Temperature Buzzer
The circuit is small regulatorof temperature, us warns for the increase of temperature. The control of temperature becomes from the thermistor TH1, that is nega...
Electronic Lock with 4013 – Circuit Schematic
Electronic Lock with 4013
This circuit is very basic to build. To open a the lock which is connected to the K1 Load you must press each momentary switch in the correct sequence. The sequ...
Burglar Alarm with 555 – Circuit Schematic
Burglar Alarm with 555
This alarm circuit is based on two 555 timers. The alarm will sound your car horn if anyone opens the car door while the circuit is armed. The timers will allow...
Sun - Up Alarm with 4011 – Circuit Schematic
Sun - Up Alarm with 4011
The Sun - Up Alarm can be used to provide a audible alarm for when the sun comes up or it can be used in a dark area and detect when a light comes on. It can al...
50MHz Transmitter alarmer with PIC16F84 – Circuit Schematic
50MHz Transmitter alarmer with PIC16F84
This project is about an IR-detector (Infra Red) combined with a 100mW 50MHz transmitter. The detector is sensitive to changes in IR-spectrum and is commonly u...
Bedwetting (Enuresis) Alarm with 555 timer – Circuit Schematic
Bedwetting (Enuresis) Alarm with 555 timer
A simple two tone water alarm that is light enough to be worn on the upper arm of a sleeper is described. It uses two LMC555 CMOS timer chips followed by a comp...
Security Alarm System (PIC16F877A) – Circuit Schematic
Security Alarm System (PIC16F877A)
This system uses a Microchip's PIC16F877A as a main controller, LM339 as sensor interface, UM3561 as a tone generator and ?PC2002 as a speaker driver (audio amp...
Networking Security System (ATmega16L) – Circuit Schematic
Networking Security System (ATmega16L)
TCP based security system using the Ethernet module offered within the contest , an ATmega16L microcontroller , a PIR as a sensor and few other peripheral devic...
iButton DS1990A Lock – Circuit Schematic
iButton DS1990A Lock
This electronic lock can be used with any type of iButtons you may already have, since the only thing needed is the internal serial number, that's different for...
The simplest Electronic Door Lock
To put the relay in tension the 4 buttons S1 S4 must be pressed. If anyone of the 4 butoons S5 S8 are pushed the relay donts tension ( dont receives supply vo...