Lock schematics

Build a sophisticated digital lock using logic ICs to control a relay with a 4 or 8-digit code. This innovative circuit utilizes a CD4017 decade counter and clever timing to create a robust and reliable locking system.... [read more]

Build a revolutionary electronic lock circuit with just 9V power, featuring a simple 147 code and utilizing a 4N25 optocoupler for secure isolation. This innovative schematic provides a foundation for creating robust security systems.... [read more]

Build your own secure electronic lock with this innovative 7-digit code circuit. Unlock possibilities and master the design with components like IC1 (4022), Q1 (BS170), Q2 (BD679), and explore the circuit’s potential for door control and security systems.... [read more]

Build your own secure door release mechanism with this innovative circuit, utilizing a four-digit code for precise control. This project empowers you to design a reliable system, perfect for battery-powered applications and adaptable to various voltage ranges (5-15V). Unlock potential and craft a powerful solution for your unique needs.... [read more]

Build a robust 4-digit keypad controlled switch using this detailed schematic, designed for effortless automation. This project utilizes a 12-volt supply, adaptable to 5-15 volts, and employs a versatile multi-pole relay for secure control. Implement a code entry system with up to 12 keys, ensuring reliable operation and adaptable security, perfect for inspiring your next engineering endeavor.... [read more]

Build your own sophisticated alarm control keypad and unlock limitless possibilities with this versatile schematic. This design, utilizing a SPCO/SPDT relay, transforms into a powerful general-purpose switch. Discover over 10,000 codes with a 12-key pad, or expand to 40,000+ with a 16-key pad – empowering you to create robust security systems.... [read more]