Instruction manual

FHT-1 • 10
 1. Install J2, the subminiature phone jack.. Gently push the solder tabs
through the PC board being careful not to bend or strain them. Solder all
three tabs.
 2. Install R41, 200 ohm trimmer pot (marked 201). This is the audio
output or volume control.
 3. Install R40, 100 ohm (brown-black-brown). This completes your
earphone monitor output for the transmitter.
 4. Install diode D9, the 1N4002 type (black body with a silver band). Be
sure to observe the correct polarity! See the parts placement diagram for
correct orientation.
 5. Install C54, 10 uf electrolytic capacitor. Electrolytic capacitors are
polarized with a (+) and a (-) lead and must be installed in the correct
orientation. Ordinarily, only the negative side is marked on the capacitor
body with a dark band and the (-) sign clearly shown, while PC boards
will usually show the (+) hole location. Use care to ensure proper
polarity.
 6. In the same manner, install another 10uF electrolytic capacitor in the
C53 position. See the parts placement diagram for correct orientation.
 7. Install voltage regulator VR1, marked 7805. Observe the correct
placement of the metal tab. Mount it so that the lettering on the device
faces toward capacitor C53 and jack J2. This IC provides a stable
source of 5 volts for the digital sections of the circuit.
 8. Install the LED’s (light emitting diodes) D8 and D7. Being diodes,
these components are polarized and must be installed with regard to
their polarity. Identify the cathode (or - lead) side lead which is the
shorter of the two component leads, and is usually marked with a “flat”
notch on the plastic body of the LED. These leads should face toward
the outside of the PC board as shown in the parts placement diagram.
 9. Install R34, 390 ohm (orange-white-brown). Notice that this resistor
is “standing up” on the circuit board.
 10. Install R33, 390 ohm (orange-white-brown) in the same manner.
 11. Install R36, 10K ohm (brown-black-orange).
 12. Install C50, .01 uF disc capacitor ( marked .01 or 103 or 10nF).
 13. Install R39, 10K ohm (brown-black- orange).
 14. Install C49, .01 uF (marked .01 or 103 or 10nF).
 15. Install R38, another 10K (brown-black-orange).
 16. Install R37, yet another 10 K (what colors were those?!) (brown-