This is touch alarm circuit.Here I have used very common Ic NE555 And common parts.Then easily you can make your circuit.You can attach this circuit for your door lock or for any other metal part.If some one touched that metal part the alarm will start to ring.You can use this circuit as a security circuit.Even you can attach this circuit for your fence.
Parts
# Transistor 2N3904
# Diode 1N4004
# IC LM555
# Relay
# Resistor 56 K
# Resistor 100 K
# Resistor 10 M
# Resistor 220 K
# Capacitor 47 uF at 16 V
# Capacitor 33 uF at 16 V
# Potentiometer 100 K
Note
# This circuit operates with 6V battery
#Connect touch pad to the metal plate of your main door or fence
14 comments:
what is meant by "not" in parts discription
Hi,
Ohhh....Sorry it is a printing mistake.
could you plz make available a circuit diagram for unmanned level cross
My email id is tarunkoshi@gmail.com
yes I can design a circuit.Before that Tell me the purpose of finding such circuit.And I want to know the speed of the train and the wide of the rail way etc..
Hi,
I am trying to build this circut, and can you please explane me where do I connect speaker ? thank you very much !
you can send it to my e-mail marko.kosic94@gmail.com
Hi
Here you can't attach speaker directly.attach a alarm circuit to the relay.
keep in touch
Could you plz make Human Detector Alarm circuits diagram when human cross it. Plz send this e-mail
ragvndra27@gmail.com
it doesn't work
it doesn't work
then you better check Q1
Q1 is OK - touching the touch pad does not trigger anything - and the 555 is OK
Check pins of the Ne555 and Check whether relay has the correct voltage
Has anyone constructed this circuit and made it work? I think the idea is great but I just can't get it to operate. Obviously I am doing something wrong - I have checked the components, checked the circuit and wiring a number of times. But it just wont work.
it doesn't work after wear shoes