Assembly Manual

Mike Fortney

04/02/2006

CricketSat LC Receiver

Index• Parts List

• Circuit Board Assembly

• Testing

• Troubleshooting

Parts List Speaker 6” black antenna wire 1” black jumper wire Green printed circuit board 9-Volt battery snap connector Power switch RF receiver module LM386 IC chip 8-pin DIP socket 5-Volt regulator (black 3-pin

device) Red LED

Protection diode (1N4001) Audio jack connector Three small yellow 0.1uF

capacitors Blue cylindrical 47uF capacitor Volume control potentiometer 10 ohm resistor, brown-black-

black-gold 680 ohm resistor, blue-gray-

brown-gold 180K ohm resistor, brown-

gray-yellow-gold

Circuit Board Assembly (1 of 7)

White band

D1, 1N4001 diode (polarized)

R2, 680 Ohm (blue-gray-brown)

R3, 180 kOhm (brown-gray-yellow)

R5, 10 Ohm (brown-black-black)

C3, 0.1 uF capacitor

C4, 0.1 uF capacitor

C5, 0.1 uF capacitor

Circuit Board Assembly (2 of 7)

Masking tape may help

SW1, switch

8-pin socket for U3

R4, volume potentiometer

D2, red LED (polarized)

J1 audio jack

J2 speaker 2-pin header

Notch end up Longer lead is positive (+)

Circuit Board Assembly (3 of 7)

U1, 5-V regulator

U2, RF receiver module

U3, LM386 amplifier

C1, 47 uF capacitor (polarized)

C2, 47 uF capacitor (polarized)

C6, 47 uF capacitor (polarized)

Notch end of U3 up

White bands

up

Flat edge of

U1 down

White band on C6 to the right

Circuit Board Assembly (4 of 7)

9-Volt battery snap connector (POLARIZED)

Solder wires on top of

board

Snip off excess wire

Route through strain relief holes

Red lead to B+ Black lead to B-

Circuit Board Assembly (5 of 7)

Black 6-inch antenna wire

Solder antenna wire on top of board. Trim excess wire.

Circuit Board Assembly (6 of 7)

Black 1-inch jumper wire

Solder wire on top side of circuit board. Trim excess wire.

Solder wire to this lead of R3 on this side of circuit board.

Circuit Board Assembly (7 of 7)

Attach battery

Attach speaker to J2 (non-polarized)

Assembly is complete!

Testing• Slide power switch to “ON” position.

• The red LED should light and change brightness with according to signal strength.

• If the LED does not light, TURN OFF IMMEDIATELY and proceed to the next slide “Troubleshooting”

• Turn the volume control to a mid position and you should hear a hiss from the speaker.

• Test the unit with a CricketSat. You should hear a tone or clicking sound up to 1000 feet away.

Troubleshooting

• No sound or lights, no smoke– Try a new battery

– Insure that slide switch is working properly

– Check if battery leads correctly attached to board, red +, black -

– Check if D1 diode is properly installed, white band -

– Check if amplifier IC and RF receiver modules installed properly

• No sound, but lights– Turn volume control to a median setting. Should hear hissing

sound

• Does not receive CricketSat tone or pulses– Receiver module may be faulty or need re-tuning