Assembly Manual Mike Fortney 04/02/2006 CricketSat Receiver

Index Parts List Parts Layout Completed Board - Top View Circuit Board Assembly Enclosure Modifications Final Assembly Testing Troubleshooting Schematic More sections to be added: Features, Specifications, Circuit Description, Normal Operation, Data Logging with a Computer, Optional Accessories

Parts List (1 of 2) Verify that you have the following parts in your kit. If not send an to Use the photo two pages ahead to identify parts Speaker Antenna 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 and green LEDs

Parts List (2 of 2) Two black tubular LED standoffs Protection diode (1N4001) Audio jack connector External power jack connector Blue 220uF capacitor Five small yellow 0.1uF capacitors Blue cylindrical 47uF capacitor Volume control potentiometer 10 ohm resistor, brown-black-black-gold Two 680 ohm resistors, blue-gray-brown-gold 180K ohm resistor, brown-gray-yellow-gold

Parts Layout J3 not installed Antenna Wire

Completed Board - Top View Data LED (Red) Audio Data JackAntenna (See prior diagram for wiring) DC Power Jack Power LED (Green) RF Receiver Module Power Switch Battery Leads (Red - Right Black - Left) 5-Volt Regulator (flat side outward) Coupling Capacitor Speaker Leads (Non-Polarized) LM386 Amplifier IC Volume Control Potentiometer

Circuit Board Assembly (1 of 4) Refer to layout images on previous pages Install the parts in the following order: Resistors –R1 & R2, 680 Ohm, blue-gray-brown-gold –R3, 180K Ohm, brown-gray-yellow-gold –R5, 10 Ohm, brown-black-black-gold 0.1uF capacitors (C1, C3, C4, C5, C7) D1 diode, banded end is negative (-) R4, volume control

Circuit Board Assembly (2 of 4) S1, power switch IC socket, 8-pin DIP, notch towards R3 U3, LM386 IC, notch towards R3 U1, 5-Volt regulator, flat side facing C1, mount as close to the board as possible C2, 47 uF capacitor, white stripe is negative (-), mount close to the board C6, 220 uF capacitor, black band end is negative (-), indented end is positive (+)

Circuit Board Assembly (3 of 4) J1 & J2, power and audio jacks U2, RF receiver module, mount as close to the board as possible D2 & D3, red and green LEDs, mount with standoffs, tight to the board –Positive LED lead is the longer of the two leads LEDs with standoffs

Circuit Board Assembly (4 of 4) 9-Volt battery clip, red (+) and black(-) wires Antenna –Solder black wire into the hole shown below J3 not installedAntenna Wire

Enclosure Modifications(1 of 2) Remove the two screws from back of the enclosure and remove the back cover Drill holes where indicated by the black dots shown below Center punch the hole first to insure proper alignment Drill holes using a 1/8 inch drill bit 1/8” holes for the LEDs

Enclosure Modifications(2 of 2) Cut out the blacken shapes shown below using a nibbling tool, file or a saw Remove the template stickers once complete and clean rough edges with a file Remove material

Final Assembly(1 of 2) Remove two circuit board mounting screws from enclosure Solder speaker wires to circuit board Mount antenna into center slot and tighten into place Route battery cables Circuit board mounting screw Antenna slot Guide post and hole Circuit board mounting screw

Final Assembly(2 of 2) Fit circuit board into place in following sequence –Use previous diagram to aid in this assembly –Bend RF receiver module slightly towards antenna coax cable –Lower into place, and mate switch lever with plastic thumb slider piece on inside of enclosure –Align and lower circuit board guide holes over enclosure vertical guide posts –Press and wiggle circuit board until LEDs pop through holes of front of enclosure –If problem seating board, check that coax cable is not between RF module and speaker. If so, move cable, and repeat above steps. –Secure circuit board with two screws Route battery cable, but DO NOT install the battery yet Attach back of enclosure and secure with screws

Testing Slide power switch “ON”. Using a multimeter, perform a short circuit test on the battery clip, reverse the leads and repeat. You should measure no values less than 5K ohms. Attach the battery and its cover. The unit should be “ON” indicated by the green LED The red LED may briefly flash as the unit is switched on Turn the volume control to a mid position and you should hear a hiss from the speaker. Test the unit with a CricketSat. The red LED should mimic the CricketSat LED for distances in excess of 200 feet.

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