3
4. Parts List
4.1 Resistors
(may be supplied either with 4-band or 5-band colour codes, see below)
R1
1K resistor (brown-black-red-gold OR brown-black-black-brown-brown)
R2
1K resistor (brown-black-red-gold OR brown-black-black-brown-brown)
R3
470-ohm resistor (yellow-purple-brown-gold OR yellow-purple-black-black-brown)
R4
470-ohm resistor (yellow-purple-brown-gold OR yellow-purple-black-black-brown)
R5
470-ohm resistor (yellow-purple-brown-gold OR yellow-purple-black-black-brown)
R6
1K resistor (brown-black-red-gold OR brown-black-black-brown-brown)
R7
560-ohm resistor (green-blue-brown-gold OR green-blue-black-black-brown)
R8
470-ohm resistor (yellow-purple-brown-gold OR yellow-purple-black-black-brown)
R9
470-ohm resistor (yellow-purple-brown-gold OR yellow-purple-black-black-brown)
R10
Not supplied
– space is provided on the PCB for an active external antenna voltage supply
4.2 Capacitors
C1
0.1uF (ceramic, marking 104)
C2
0.1uF (ceramic, marking 104)
C3
22uF (electrolytic)
C4
22uF (electrolytic)
C5
0.1uF (ceramic, marking 104)
4.3 Semiconductors
IC1
74ACT08, 14-pin DIP chip
IC2
LM317LZ voltage regulator, three-wired TO92
D1
3.6V zener diode
LED, red
3mm red LED for power indication
LED, yellow 3mm yellow LED for serial data output indication
LED, green 3mm green LED for 1pps indication
4.4 Inductors
L1
0.1uH axial inductor
L2
0.1uH axial inductor
L3
Not supplied
– space is provided on the PCB for an active external antenna voltage supply
4.5 Miscellaneous
Printed Circuit Board (PCB), 91 x 64mm size
Mediatek chipset GPS engine RF module, pre-soldered to PCB
25 x 25mm ceramic patch antenna, custom-tuned to match the PCB layout and ground-plane
3V rechargeable Lithium coin cell battery
4pcs 12mm nylon hex spacer
4pcs M3 nylon screw
5. Construction
Parts placement is defined by the silkscreen printed legend on the PCB, so please observe it carefully,
paying particular attention to the correct orientation of all the semiconductors, and the two electrolytic
capacitors C3 and C4.
