Wordpress guide

This is a very useful circuit diagram because these days there are lots of crimes in every where.So I suppose this would be an answer for your matter.Here I have used common Transistor BC107.After fixing this circuit switch on s1 and adjust R2 until the horn makes sound.Then switch off the s1 .Now if some one broke the thin wire the horn will make a sound.You can cover your garden with this circuit Note # Build this circuit on a PCB #Don't supply more than 12V # Use very thin wire to get good results

This is simple door alarm circuit.You can attach this circuit for your for your main door If somebody opens it alarm will activate. Sw1 is a Read switch.Those switches are operated with magnets. Parts: Q1 = BC547 Q2 = BC327 B1 = 3V Battery R1 = 330K R2 = 100R C1 = 10 nF -63V C2 = 100 uF -25V SW1 = Read Switch Note # Don't supply more than 4.5V for this circuit #Attach a magnet for the door frame near by the read switch

Tis is a circuit of a siren.I suppose this would be very usefull circuit for you all.This circuit operates with 9V power supply

This is so impotent circuit for you.These days we can see robberies are increasing day by day so I design this to stop them.Here I have used thin copper wire If someone disconnected it, the alarm will start to ring.So use this to prevent robberies. Note # Use 5v To 15v power supply for this #Use SWG 36 or higher

This is a very useful circuit for you all.This is actually little bit different circuit.Because this circuit has used little bit advance knowledge.This circuit operates with 9V.You can fix this circuit for a door(SW1).Its ok though people use this door.But if some one keep opened it more than 30 seconds the alarm begins to ring.only users should know they should closed the door before 30 seconds.Think different way and use this in different way.