This is telephone spy unite.You can transmit signals up to 200feet.This circuit operates with 88-94MHz.This circuit doesn't want extra power it uses the power of the line.
Note
# If the LED burning out as a problem of your circuit, add a 300 ohm 1/4W resistor in series with it
plz tell me what does it mean
ReplyDeletein 1 in 2
out 1 out 2
and
how make antenna ?
thnx
in 1 in 2 mean line in of the telephone.
ReplyDeleteout1 out 2 mean line out of the telephone
Because we cant disconnect the line so we get the signals in and re connect the line
in 1 in 2 mean line in of the telephone.
ReplyDeleteout1 out 2 mean line out of the telephone
Because we cant disconnect the line so we get the signals in and re connect the line