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Electronic Circuits Electronic Combination Lock circuit. Electronic circuit CD4013 ICs are used. 2-3-6-9 used to hold temporary password . Change the password by modifying the electronic circuit . Electronic Circuit unscheduled work . Making simple and easy. The circuit can use it anywhere you want .  Electronic Combination Lock Circuit Diagram With Parts

This Digital Electronic Lock Circuit Diagram 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 counter will advance. As each correct key is pressed, a low level appears at the output of the dual NAND gate producing a high level at the output of the 8 input NAND at pin 13. Digital Electronic Lock Circuit Diagram The momentary high level from pin 13 activates a one shot circuit which applies an approximate 80 millisecond positive going pulse to the clock line (pin 14) of the decade counter which advances it one count on the rising edge. A second monostable, one shot circuit is used to generate an approximate 40 millisecond positive going pulse which is applied to the common point of the keypad so that the appropriate NAND gate will see two logic high levels whe...

Simple Electronic Lock Circuit diagram. There are six (or more) push switches. To 'unlock' you must press all the correct ones at the same time, but not press any of the cancel switches. Pressing just one cancel switch will prevent the circuit unlocking. When the circuit unlocks it actually just turns on an LED for about one second, but it is intended to be adapted to turn on a relay which could be used to switch on another circuit. Please Note: This circuit just turns on an LED for about one second when the correct switches are pressed. It does not actually lock or unlock anything! Simple Electronic Lock Circuit diagram :   Simple Electronic Lock Circuit Diagram Stripboard Layout : Parts : resistors: 470, 100k ×2, 1M capacitors: 0.1μF, 1μF 16V radial on/off switch push-switch ×6 (or more) stripboard 12 rows × 25 holes red LED 555 timer IC 8-pin DIL socket for IC battery clip for 9V PP3   A kit for this project is available from RSH Electronics: www.kpsec.freeuk.com Copyright ...

The circuit above above makes use of the CMOS 4017 decade counter IC. Each depression of a switch steps the output through 0– 9. By coupling the output via an AND gate to the next IC, a predefined code has to be input to create the output. Each PBS switch is de bounced by tw1o gates of a CMOS4001 quad 2-input NOR gate. This ensures a clean pulse to the input of each CMOS4017 counter. Only when the correct number of presses at PBS Awill allow PBS B to become active. This is similar for PBS C and PBS D. At IC4, PBS D must be pressed 7 times. Then PBS C is again pressed 7 times, stepping from output 1 to output 8. The AND gate formed around CMOS4081 then goes high, lighting the LED. The Reset switch can be pressed at any time. Power on resetis provided by the 100n capacitor near the reset switch. Below is a picture of one that I made about 15 years ago:   Unfortunately, this board was part of a much larger project containing multiple power supplies. One day whilst working on anot...

There are six (or more) push switches. To 'unlock' you must press all the correct ones at the same time, but not press any of the cancel switches. Pressing just one cancel switch will prevent the circuit unlocking. When the circuit unlocks it actually just turns on an LED for about one second, but it is intended to be adapted to turn on a relay which could be used to switch on another circuit. Please Note: This circuit just turns on an LED for about one second when the correct switches are pressed. It does not actually lock or unlock anything! Simple Electronic Lock Circuit diagram :   Simple Electronic Lock Circuit Diagram Stripboard Layout : Parts : resistors: 470, 100k ×2, 1M capacitors: 0.1μF, 1μF 16V radial on/off switch push-switch ×6 (or more) stripboard 12 rows × 25 holes red LED 555 timer IC 8-pin DIL socket for IC battery clip for 9V PP3   A kit for this project is available from RSH Electronics: www.kpsec.freeuk.com Copyright :John Hewes 2006,  The Electronics...

This is of course the simplest electronic code lock circuit one can make. The circuit uses one transistor, a relay and few passive components. The simplicity does not have any influence on the performance and this circuit works really fine. One Transistor Code Lock Circuit Schematic The circuit is nothing but a simple transistor switch with a relay at its collector as load. Five switches (S0 to S4) arranged in series with the current limiting resistor R2 is connected across the base of the transistor and positive supply rail. Another five switches (S5 to S9) arranged in parallel is connected across the base of the transistor and ground. The transistor Q1 will be ON and relay will be activated only if all the switches S0 to S4 are ON and S5 to S9 are OFF. Arrange these switches in a shuffled manner on the panel and that it. The relay will be ON only if the switches S0 to S9 are either OFF or ON in the correct combination. The device to be controlled using the lock circuit can be co...