-9-
Tug slightly on all parts to make sure that they are
indeed soldered.
A solder bridge may occur if you accidently touch
an adjacent foil by using too much solder or by
dragging the soldering iron across adjacent foils.
Break the bridge with your iron.
Make sure that all of the parts are placed in their
correct position.
Check if the transistors’
orientations are correct.
Make sure that the polarity of the LED and
microphone are placed in the correct position.
FOIL SIDE OF PC BOARD
OPERATING THE FM MIC
After assembling the kit, it will be necessary to tune
in the transmitter. First, be sure that all of the parts
are in correctly and that you have good solder
connections without any solder shorts.
Get an FM radio and tune it away from any FM
stations.
You should hear only noise and no
programs. Place the unit about 2 feet from the radio
with the microphone facing the radio speaker.
Remove the foam cover and tune the RF coil with
the tuning stick and listen for a howl in the radio.
This indicates that you have tuned the transmitter to
the FM radio frequency. Place the transmitter away
from the radio until the howl disappears. Talk into
the microphone and you should hear your voice on
the radio. If your voice comes through the radio
distorted, speak softer (you are over-modulating).
Push the foam cover onto the case when tuned.
Have a friend listen to the radio and move the
transmitter about 100 feet away. Your voice should
still be heard over the radio.
To obtain further
distance, add a longer antenna.
TO CONSERVE BATTERIES, TURN THE POWER
SWITCH OFF WHEN NOT ACTUALLY TALKING.
TROUBLESHOOTING
