Infrared Intruder Alert

Step 3 Build the Circuit

The circuit is designed so the photocell triggers the 6 volt relay which in turn closes the switch on the transmitter, sending the signal to the receiver and ringing the chime. I built it as small as possible because I wanted everything to fit inside the smallest Radio Shack hobby box.

Comments

[gjscholtz]

INTERRESTING PROJECT YET
I have several questions:
1 Is the 100ohm used as a limiting resitor for Receiver??
2 Why is it not used for the Transmitter?
- Is the Transmitter and Receiver part of the garage door system??
If it is then glueing the photocell over the Receiver will cause the garage door not able to work.
3 What energizes the photocel - How? What light source is used? since the photocel is glues over the Receivers 'light input' so not allowing to get any light from the Receiver!
I drew your diagram out on a schematic to be able to folow the circuit closely and as I can see it when the phtocell is energized [ I donot know how?] This will turn on the transister and in turn will turn on the relay!!!!!
I dont see the connection of the circuit in rlation to the Transmittter and Receiver!
I believe if you drew a schematic of the entire circuit I'm sure that your project would be much clearer to understand!
At lest for me - thanks

[tomtortoise]

does anyone know of a substitute for the transistor i cant find them at radio shack or online?

[Highjump44]

can some one do a vid of them setting this up on a board and soldering it