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Key Code Combination High Security Door Lock – Circuit Schematic
Key Code Combination High Security Door Lock
This project is an electronic lock with many combinations that you can easily change and opens only with the correct combination of four consecutive numbers. Th...
Rain alarm schematic circuit diagram – Circuit Schematic
Rain alarm schematic circuit diagram
FIG. 1 is a circuit diagram of it, it is in the audio circuit from the resistance between the two leads to a probe to rain alarm. Fig. 2 with CCL to make a prob...
Fire Alarm schematic design – Circuit Schematic
Fire Alarm schematic design
Explanation Here is a simple fire alarm circuit based on an LDR fire detection sensor. Smoke generated during circuit generates an audible alarm, fire smoke in ...
Telephone electronic lock circuit – Circuit Schematic
Telephone electronic lock circuit
Electronic lock using the telephone key (resistor connected plug) is inserted after the oscillator circuit start-up circuit, and the oscillation frequency is ac...
Ultrasonic insect repellent circuit – Circuit Schematic
Ultrasonic insect repellent circuit
Electrical pulses generated by the first base circuit pin output, and then sent through R6 piezoelectric speaker BLD, switched to the electric pulse ultrasonic ...
Electronic watchdog circuit – Circuit Schematic
Electronic watchdog circuit
Doppler effect sensor Nl (RD627), operational amplifier N2 (LM358), the sound of dogs barking imitation special integrated circuit N3 (KD5608) and other compone...
Door alarm circuit with a time of recognition NE555 – Circuit Schematic
Door alarm circuit with a time of recognition NE555
Door alarm here with a time recognition, the owner opened the door is normally open the door, open the door to complete the action within the general 30s, so it...
Break burglar alarm circuit II – Circuit Schematic
Break burglar alarm circuit II
Ding for the circuit principle: care, vs SCR trigger grounded, it is in the off state. When someone leads A burglar broke, the SCR trigger end to give a trigger...
Nine-digit password composed of the controller circuit diagram CD4017 – Circuit Schematic
Nine-digit password composed of the controller circuit diagram CD4017
Digital controller password as shown by the nine-digit password, and a total of 11 keys, including four pseudo-code keys, 7 keys have two valid keys for the ove...
Delay electronic doorbell circuit - touch doorbell amplifier circuit – Circuit Schematic
Delay electronic doorbell circuit - touch doorbell amplifier circuit
Delay electronic doorbell circuit - touch doorbell amplifier circuit ...
Thermal electromagnetic circuit long delay over-current release – Circuit Schematic
Thermal electromagnetic circuit long delay over-current release
DK-5A, 5D, SDb control box, all with a thermal electromagnetic overcurrent release, the circuit shown in Figure 6-80. Trip has overload and short circuit instan...
Thermal electromagnetic circuit long delay over-current release – Circuit Schematic
Thermal electromagnetic circuit long delay over-current release
DK-5A, 5D, SDb control box, all with a thermal electromagnetic overcurrent release, the circuit shown in Figure 6-80. Trip has overload and short circuit instan...
DBS-20-type leakage protection circuit – Circuit Schematic
DBS-20-type leakage protection circuit
DBS-20-type leakage protection circuit ...
Current leakage protection circuit – Circuit Schematic
Current leakage protection circuit
Current leakage protection is currently the most used and best leakage protection device. Current leakage protector fork into electromagnetic and electronic two...
Combustible gas alarm circuit – Circuit Schematic
Combustible gas alarm circuit
Combustible gas alarm circuit is shown. Circuit by the gas sensor, multivibrator and audio output roads. Multivibrator integrated circuit by the NAND gate way ...
Agricultural harvester warehouse full schematic reminder – Circuit Schematic
Agricultural harvester warehouse full schematic reminder
Circuit works The harvester warehouse full of reminders by the photodetector amplifier circuit and sound and light alarm circuit, as shown in Figure 1. Circuit...
A circuit diagram of a danger zone warning device – Circuit Schematic
A circuit diagram of a danger zone warning device
Circuit works The danger zone warning circuit from the regulator circuit, the pyroelectric infrared detection trigger circuit, electronic switching circuit, vo...
A deaf visual doorbell circuit – Circuit Schematic
A deaf visual doorbell circuit
Circuit with the original m rJ bamboo is also exactly the same way. Trl lose. the secondary disk sV flood-what I guanidine by day. t love grass-flow filter for...
Normally closed contact burglar alarm circuit diagram – Circuit Schematic
Normally closed contact burglar alarm circuit diagram
Circuit schematic shown in Figure 1.SCR, R1 and AN SCR trigger switch circuit composed; IC1, R2, VT1, VT2 and BL siren composed of analog circuits. Usually, AN...
Car or room timer alarm circuit diagram – Circuit Schematic
Car or room timer alarm circuit diagram
Circuit photoelectric switch S1 is gated or luggage room light control switch. A point is in its closed operating voltage is positive. If S2 is closed, regardl...