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Category Archives: Security And Safety

  1. [TC] Remote controlled Spy Bot

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    June 28, 2013 by todayscircuits


    Here is a remote operated spy robot circuit which can be controlled by using a wireless remote controller. It can …
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  2. [TC] Secure Digital Access System using iButton

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    June 14, 2013 by todayscircuits


    Access control forms a vital link in a security chain. Here we describe a secure digital access system using iButton …
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  3. How to build Digital Electronic Lock

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    May 8, 2013 by todayscircuits


    Circuit Description The digital lock shown below uses 4 common logic ICs to allow controlling a relay by entering a …
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  4. XREP – A Combination of Taser and Shotgun

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    July 15, 2011 by todayscircuits


    We have already discussed about StunRay Technology and its capability to substitute tasers and guns used in law enforcement. But, there are …
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  5. PIR Sensor Based Security System

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    July 15, 2011 by todayscircuits


    The circuit of an inexpensive and highly secure electronic security system is explained below. This electronic security system can be …
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  6. Night security light

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    June 28, 2011 by todayscircuits


    Description. Here is a simple circuit switches on a light around 2 hours after midnight, the time at which most …
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  7. >Low cost fire alarm circuit

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    June 25, 2011 by todayscircuits


    > Description.When there is a fire breakout in the room the temperature increases.This ultra compact and low cost fire alarm …
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  8. >Fire alarm circuit

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    June 25, 2011 by todayscircuits


    > Description. Here is a simple fire alarm circuit based on a LDR and lamp pair for sensing the fire.The …
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  9. >One transistor code lock

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    June 19, 2011 by todayscircuits


    > Description.This is of course the simplest electronic code lock circuit one can make. The circuit uses one transistor, a …
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  10. >Shock alarm circuit

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    June 11, 2011 by todayscircuits


    > Description.Here is a simple shock sensitive alarm circuit that has many many applications fro home to automobiles.The main application …
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