alarm - electronic project

[yyy]

I search after electronics project that explain exactly how to build an alarm

[Soeren]

Hi,

You'll have to be a bit more precise!
An alarm is something that draw peoples attention to something, whether it's something that's too: Hot, cold, wet, dry, light, dark etc.

What condition do you need the alarm for?

[Pierre]

Without knowing how experience you are, It might be easier if you start with the most simple alarm.

I use two simple one in my workshop.

     1.  Control Relay, Buzzer(electronic schime), switch magnet for house alarm; and

     2.  Similar but with resistors, diode and SCR.

Don't have a schematic but can easily draw it with explanations

[yyy]

Alarm for burglar
The simple alarm is what I search
I search an electronic circuit of this and If it have a code I also want it

[SmAsH]

More info plox.
What should set off this alarm? Just saying "burglar alarm" is a very vague term and could mean thousands of things.

[Soeren]

Alarm for burglar
The simple alarm is what I search
I search an electronic circuit of this and If it have a code I also want it

Here you go: http://tinyurl.com/yj4kynk

[Pierre]

yyy:  As I promised, this one is easy.

     You only require:
          - Electric chime ( Radioshack);
          - 1KOhms resistors X2;
          - Control Relay;
          - Green and Red LED; and
          - Magnetic switch.

The schematic and picture should be worth a thousand words.  This is a start and get your imagination to make modification i.e. sensors, wireless.

I should say thank you.  I now got my two kids with a new toy to play with.  

I get B minus with the schematic done by hand but did not find a good software yet.  


Soeren:    Love that link.