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Last Updated
03/31/2019
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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION. |
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LOCK -- ELECTRONIC x COMBINATION LOCK -- ELECTRONIC x DIGITAL LOCK x KEYLESS LOCK -- ELECTRONIC xx LOCK Electronic combination lock circuit sounds an alarm if the wrong button is pushed. Est. cost: under $10. How to activate an electric door strike using the X-10 control system. This allows a locked door to be opened without retracting the latch bolt. Electronic door locks. How they work and how to wire an electronic lock to your home controller. Digital, combination-lock circuit uses a keypad to activate a garage door, electric gate, electric locks, etc. Est. cost: $23 (kit). Digital combination lock. Keyless electronic entry system uses a keypad to control a 12-volt solenoid which unlocks the door. Combination lock is electrically operated by pushing four buttons in the right order, otherwise an alarm sounds. Electrolok. An electronic combination lock requires 5-digits to be entered in the correct sequence. Use to control any electric device. Electronic combination lock features 512 9-bit code combinations. The Compulock, a digital keypad combination lock that can be used anywhere that you would use a key-operated switch (alarm systems, electric door locks, etc.). Est. cost: $25. Electronic combination lock/alarm control. Est. cost: $45. Electromagnetic door locks. Advice on selection and installation. Tip: How to devise a secret code to etch on casings of combination locks so you'll never forget the combination, but no one else will be able to figure it out. Circuit for an electronic combination lock. Up to 10,000 combinations using 5 switches. Use it to operate another circuit or electrically operated lock. Est. cost: under $10. Electrolock, a battery-powered keyless lock. Dialing the correct combination activates a solenoid which opens a barrel bolt. Sequence operated lock. An electronic lock with seven buttons which must be pushed in the proper order for the lock to open. Electronic lock is keyed by a modulated light beam operating at 2000 flashes per second. The "key" is built into an ordinary pen-light flashlight. Keyless, electronic combination ignition lock for a boat. Electronic lock uses 3-digit combination. Numerical grouping, two timing circuits and a penalty fixture make "cracking" it difficult. Electronic combination lock offers up to 10,000 differnt combinations of 4-digits. Operates on 117-volt or 12-volt. Electronic combination lock works on 12-volts. Uses a 5-button combination for 120 possible combinations. Can be expanded to more buttons. Electronic combination lock has ten keys. It is capable of 30,240 combinations. Uses a five digit code pattern. Code must be entered within ten seconds. Est. cost: $20. Twelve button electronic lock must be pushed in the right sequence and within the right time limit in order to activate an electric circuit. Use for cars and boats in place of keys. The versatile keypad. How to interface decimal and hexadecimal keypads to digital circuits. How to debounce the mechanical switch (key). Typical uses include computer data entry, electronic combination locks and a controlled pulse generator. Circuit for a digital combination lock for a car's ignition switch. Use your TRS-80 computer as a combination lock. Program plus simple circuits to control doors, appliances, and telephone lines. Electronic combination lock uses rotary switches to prevent unauthorized use of electric-powered equipment. Keypad sequential switch is a simple way to add an electronic combination lock to your security system. Four switches must be closed in the correct sequence and within a time limit. Digital entry lock. Digital combination-lock circuit is operated from a keypad and can control any electrically-operated device (such as a garage door opener, electric lock, etc.). Keyless lock circuit is built around this sequential digital switch circuit that uses a four-bit latch and four-input NAND gate. Electronic combination lock circuit requires that three numbers be entered (via rotary switch) in the correct sequence. Build a digital combination lock. Use a keypad to enter a three-digit code which controls an electric lock. Electronic locks. (1) Simplified digital lock. (2) Jack lock uses a plug-in headphone jack to activate. (3) Frequency-based lock uses a tone-generator circuit as the "key". Voice recording and playback. Using the ISD1000A Direct Analog Storage Technology integrated circuit to construct a variety of circuits capable of storing and playing 20-seconds of audio. Part 2. Includes a tone-controlled lock and a tone generator. Electric garage door lock requires you to set each of four (or more) rotary switches to the correct position before trying to raise the door. Push-button electronic lock circuit protects power tools from children. Circuit for an electronic digital combination lock requires that a 7-digit number be entered within a fixed period of time. Electronic locks. A look at how two binary-lock circuit modules work. Home security system. Low-cost home alarm system features a digital combination lock, optional display circuitry, and simple installation. Can also be used as an automobile or marine intrusion alarm, an ignition combination lock, or both. Multiple output contacts accommodate devices such as a siren, automatic telephone dialer, and floodlights. Part 1. Home security system. Part 2. Electronic combination lock is activated by an electronic "key" you carry with you. There is no keypad required. Digital keyless entry system is built around Motorola's popular 68705 microcontroller. It accepts keypad input and then energizes an electromechanical door latch after the proper entry code has been entered. Est. cost: $75. Electronic Dial Lock. Telephone dial and electronic circuitry provide a keyless lock for doors. Est. cost: $25. Electronic (digital) lock uses push buttons to enter a 6-digit number sequence. Est. cost: $25. Electronic lock protects anything that runs on electricity. Correct combination of 5 push buttons must be entered for lock to "open". | |||||||||
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