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Electronic circuits archive 

Electronic circuits -> Security


Personal Alarm - These handheld piezo screamers are also known as rape alarms. They are a very loud siren.
Personal silent alarm system
PIR motion detector
Proximity alarm
Proximity switch
Radio Wave Alarm
RF Alarm
Simple alarm system
Single Zone Alarm
Small Radio Transmitter
Small Radio Transmitter
Smart lock (12C508A). The base sends a data sequency (the password) which is recognized by the key. The key checks the sequency and -if it recognises it -sends to the base another data sequency, as an answer to the password. At the time when the base gets a correct answer (which means that the key has been introduced), the relay is put into action, and it can command a number of consummers.
Stun Gun
Stun gun (1)
Stun gun (2)
Stun gun (3)
Telephone line monitor. If you feel that somebody is tampering with your telephone line you might find this little circuit useful. It detects if there is another telephone connected to the line, if there is a short or an open line. (simple)
The Surfer’s Preserver. It is a simple device that prevents other phones in the house from disrupting your critical Internet session by disconnecting them from the line while you surf! It is also useful in preventing eavesdropping from other extensions.
Tiny 2-zone alarm
Touch activated alarm system

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