This alarm system has 6 independent zones, 1 timed entry/exit zone, a 7 segment LED display and a test or walkthrough facility. Suitable for a small office or home environment, it can also be adapted to use a combination lock or keypad to set and reset the alarm. This alarm has a 7 segment LED [...]
This circuit operates with 12V DC, with purpose to obtain more power than the siren circuit already and to avoid the use of ICs. With a simple and usual use parts, this device are easy to made and very portable. The complementary transistor pair (Q2, Q3) is wired as a high efficiency oscillator, directly driving [...]
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. Choose the five keys you want [...]
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