Alarms and security schematics

Build versatile motorcycle alarms with these compact, easy-to-construct circuits. Protect your Classic Bike and other valuable equipment with these innovative designs – perfect for safeguarding removable panels, panniers, and more. These alarms offer instant protection and peace of mind, enabling you to create custom security solutions for any situation.... [read more]

Build a powerful motorcycle alarm system with this easy-to-implement transistor circuit, safeguarding your classic bike with a virtually undetectable standby current and automatic self-arming feature. Customize the delay and protection for your vehicle.... [read more]

Unlock the power to safeguard your ride with this innovative alarm circuit, designed for ultimate protection and customizable security. This robust system features an intermittent siren, automatic reset, and the ability to immobilize your bike or flash lights – empowering you to take control. Build your own sophisticated security solution today!... [read more]

Build a sophisticated bike security system with this innovative circuit, featuring an intermittent siren output and automatic reset. Harness the power of an electronic siren (300-400mA) and unlock limitless possibilities with external relays – immobilize your bike, flash lights, and create a truly protective deterrent. This Veroboard design, incorporating Andy’s Asymmetric Timer, empowers you to elevate your security game.... [read more]

Protect your classic bike with this innovative alarm system, featuring a timed output and automatic reset. Easily adaptable to 6-volt systems, this circuit safeguards your ride while consuming virtually no standby current. Add an external relay to automatically set the alarm when you turn off the ignition, providing ultimate peace of mind.... [read more]

Protect your vehicle with this innovative engine cut-out circuit, designed to deter theft and safeguard your ride. This sophisticated system, incorporating clever delays and a reset mechanism, offers a powerful deterrent against unauthorized access, ensuring your peace of mind. Build this circuit and gain control over your vehicle's security, adapting it to your specific needs and enhancing your vehicle's protection.... [read more]

Build your ultimate vehicle security system and gain complete control with this innovative circuit design. Empower your drive with advanced delay features, instant zone activation, and automatic reset capabilities – transforming your car into a fortress of protection. Unlock the potential for automatic immobilization and light flashing, adding an extra layer of security and convenience.... [read more]

Build your own secure alarm system – instantly receive alerts when doors or windows open, or activate a panic button with this ingenious DIY phone dialer. This innovative project utilizes a PIC microcontroller and pulse dialing to connect to your cell phone, office, or other contacts, providing peace of mind and enhanced security.... [read more]

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]

Build a robust and reliable smoke detection system with this innovative circuit, safeguarding your home and pets. This design utilizes a 240VAC mains-powered smoke detector, isolated with a 12V system for safe low-voltage wiring. Experience the power of a bridge rectifier, optocoupler, and SCR to activate a high-intensity piezo siren or control larger loads like emergency lights – a must-have for peace of mind.... [read more]

Build a powerful, high-efficiency oscillator circuit using a complementary transistor pair to drive your loudspeaker. This innovative design, featuring 200mA output, allows you to create a sustained, steady tone by charging a capacitor, unlocking a world of sonic possibilities.... [read more]

Create a portable personal alarm system with a powerful 3V oscillator and loudspeaker, perfect for deterring theft and ensuring your safety. This compact circuit, housed in a protective case, utilizes a sensitive reed switch and magnet to trigger a loud alarm when your bag is unexpectedly snatched. ... [read more]

Build a powerful, covert alarm system for your laptop using this innovative circuit. This miniature alarm generator, powered by a 12V battery, protects your valuable tech with a sensitive tilt-activated alarm. Assemble this compact, matchbox-sized system using readily available components and a custom-built tilt switch for ultimate security.... [read more]

Build your own smart outdoor lighting system and transform your home with an innovative acoustic signal – a brilliant blend of security and convenience. This circuit generates an alert each time your lamp is activated, offering a unique solution for enhanced safety and a touch of technological brilliance. Discover the secrets to creating this powerful system and unlock a new level of control over your outdoor environment.... [read more]

Build your own secure alarm system with this detailed schematic! This 12-keypad design unlocks nearly 100,000 unique five-digit codes, offering unparalleled protection. Follow the step-by-step guide and veroboard layout to energize or de-energize a 12-volt relay, activating a green LED with your custom security code.... [read more]

Build your own sophisticated security system with this 12-key keypad! Unlock over 10,000 unique codes and create a powerful alarm system. Design your ideal security solution with this versatile schematic, featuring a 12-key matrix, perfect for a robust circuit board layout. Master the art of coding with this intuitive design and safeguard your space with confidence.... [read more]

Build your security system with this innovative single-zone alarm, designed to safeguard your space and empower you with precise control. Customize exit, entry, and siren cut-off timers for ultimate protection, and utilize a 5-15V power supply, including battery options, to ensure reliable operation. Achieve up to 20 minutes of siren activation, expertly tailored to your needs.... [read more]

Build a robust and reliable security system for your garage or shed with this enhanced alarm circuit. Featuring 30-second entry and exit delays, a timed siren cut-off, and automatic reset functionality, this system provides peace of mind and flexible operation. Powered by 5 to 15 volts, including a 9-volt battery, it’s ideal for battery-powered or mains operation, empowering you to safeguard your space effectively.... [read more]

Build a powerful fire door alarm circuit and safeguard your space with this innovative design. This easy-to-construct circuit, powered by a 9-volt battery, provides a crucial 30-second warning if a fire door remains open, ensuring rapid response and proactive safety. Customize the beep duration and frequency for precise monitoring and control your security system with adjustable resistor values.... [read more]

Build a powerful, responsive security system with this easy-to-construct alarm circuit. This innovative design, powered by a readily available 9-volt battery, offers exceptional reliability and a customizable output time – from a short beep to a prolonged alert lasting up to 30 minutes or more. Unlock your creativity and transform this simple circuit into a sophisticated intruder alarm, perfect for safeguarding shops, reception areas, and beyond.... [read more]

Build powerful and reliable self-contained alarm circuits with these innovative designs. Featuring three distinct alarm schematics – A, B, and C – each utilizes a Complementary Latch for minimal standby current, less than 2uA, dramatically extending battery life. Optimize performance and enhance siren output with adjustable R1 values.... [read more]

Build innovative alarm circuits with this collection of 8 schematics, perfect for battery-powered projects. Customize timing intervals and outputs using switches, thermistors, and a piezo buzzer, unlocking endless possibilities for your next electronics design.... [read more]

Build a robust security system with this innovative alarm, featuring a 30-minute siren cut-off delay – perfect for safeguarding your property and providing peace of mind. ... [read more]

Build a sophisticated and reliable burglar alarm system with this intuitive single-zone circuit. Featuring automatic Exit and Entry delays, plus a 15-minute Bell Cut-Off, this design empowers you to safeguard your property with precision. Easily integrates with normally-closed sensors like magnetic reed contacts and micro switches, and with a simple modification, accommodates normally-open triggers for comprehensive protection. Fine-tune delay times – Exit, Entry, and Bell Cut-Off – to perfectly match your needs, unlocking a powerful tool for proactive security.... [read more]

Build a robust security system with this intelligent circuit, featuring adjustable Exit and Entry delays, and a reliable Siren cut-off. Customize timing with components R4, R12, R13 and create a powerful deterrent against intrusion – perfect for integrating with Pressure Mats, Magnetic Reed Contacts, and more.... [read more]