Elektor Team
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Multi-purpose GPS Receiver

For those who are keen to know everything!

Multi-purpose GPS Receiver
Although satnav systems have been in our cars for some years now, it’s only recently that stand-alone GPSs have appeared aimed at the amateur market. Despite their small size and often very affordable prices, they have nothing to envy their predecessors, and if we team them up with suitable electronics, they can perform our positioning or navigation tasks just as accurately as the manufactured products.
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list
GPS/PC Adaptor
C1 = 470µF 25 V radial
C2 = 220nF MKT
C3 = 10µF 25 V radial
C4-C9 = 100nF ceramic
D1 = 1N4004
IC1 = 78L05
IC2 = GPS receiver type EM-406A (see text)
IC3 = MAX242 (Maxim IC)
K1 = PCB mount DC adaptor socket
K2 = 6-way SIL pinheader
K3 = 9-way sub-D socket (female), PCB mount
K4 = connector type SM06B-SRSS-RB (Digikey)
K5 = 4-way SIL pinheader
JP1 = 3-way SIL pinheader with jumper
PCB copper track layout, free download # 070309-1 from www.elektor.com

Comprehensive Autonomous GPS Receiver
Resistors (0.25W / 5%)
R1 = 100Ohm
R2-R5 = 10kOhm
R6 = 220Ohm
R7 = 0Ohm*
C1 = 100µF 25V radial
C2 = 47µF 25V radial
C3 = 10nF ceramic
C4,C5 = 22pF ceramic
LCD1 = alphanumeric LCD, 4 lines of 20 characters
IC1 = LT1300
IC2 = PIC18F2520, programmed, Elektor SHOP # 080309-41
IC3 = 74LS04
D1 = 1N5817 (must be Schottky)
D2 = 5.1V or 5.6V 400 mW zener diode
L1 = 22 µH, Panasonic type ELC08D (e.g. RS Components)
Qz1 = 20MHz quartz crystal
P1 = 10kOhm preset H
K1-K4 = 2-way SIL pinheader
K5 = DC adaptor socket
K6 = 4-way SIL pinheader
K7 = connector type SM06B-SRSS-TB(LF)(SN) (Digikey)
Type EM-406A GPS receiver (see text)
PCB copper track layout, free download # 070309-2 from www.elektor.com
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