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Category: Security Circuits / Lock Circuits Views: 5731 Rank: 0 The circuit described here is of an electronic combination lock for daily use. It responds only to the right sequence of four digits that are keyed in remotely. If a wrong key is touched, it resets the lock. The lock code can be set by connecting the line wires to the pads a, b, c, and d in the figure. For example, if the code is 1756, connect line 1 to a, line 7 to b, line 5 to c, line 6 to d and rest of the lines2, 3, 4, 8, and 9to the reset pad as shown by dotted lines in the figure.The circuit is built around two cd4013 dual-d flip-flop ics. The clock pins of the four flip-flops are connected to a, b, c, and d pads. The correct code sequence for energisation of relay rl1 is realised by clocking points a, b, c, and d in that order. T visit page. The circuit is built around two cd4013 dual-d flip-flop ics. The clock pins of the four flip-flops are connected to a, b, c, and d pads. The correct code sequence for energisation of relay rl1 is realised by clocking points a, b, c, and d in that order. T http://www.electronicsforu.com/efylinux/circuit/jan2000/jancir2.htm
Related circuits Programmable Code Lock circuit A programmable code lock can be used for numerous applications in which access to an article/gadget is to be restricted to a limited number of persons. Here is yet another circuit of a code lock employing mainly the CMOS ICs and thumbwheel switches (TWS) besides a few other components. It is... This switch will suit the Modular Burglar Alarm circuit. However, it also has other applications. The Keypad must be the kind with a common terminal and a separate connection for each key. On a 12-key pad, look for 13 terminals. The matrix type with 7 terminals will NOT do. This circuit its not write any data to the telecard. The ATtiny26 read the 16 first bytes of telecard and then store them to internal eeprom of ATtiny26. This safety-lock circuit use the new AVR microcontroller series, the ATtiny. This micros (and new ATmega8, ATmega16 etc) are powerful... 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 sequence used in this circuit is S1,S2,S3,S4. If any of the other switches are pressed the circuit will reset and you will need to start... Digital Electronic Lock schematic The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a 4 digit number on a keypad. The first 4 outputs from the CD4017 decade counter (pins 3,2,4,7) are gated together with 4 digits from a keypad so that as the keys are depressed in the correct order, the... Programmable Digital Lock circuit A programmable code lock can be used for numerous applications in which access to an article/gadget is to be restricted to a limited number of persons. Here is yet another circuit of a code lock employing mainly the CMOS ICs and thumbwheel switches (TWS) besides a few other components. It is... 1 button Security locking circuit The Button Code is a system that allows a single button to act as a keypad. The user enters a 4 digit code into the system using button taps. The button can be placed where the public can access it since like a keypad there are many combinations to keep guessers from activation the system. When... Here's an effective little combination lock that you can put together in one evening's time. To open the lock, simply dial in the correct combination on the three rotary or thumbwheel switches. With the correct combination entered, current flows through Rl into Ql's gate terminal, causing the SCR... Electronic Code Lock Project using 8051 Microcontroller
Electronic security code lock system - Door Lock - Safe Lock
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