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Notes & Errata
Automatic Starter Circuit For
Cars, Circuit Notebook, April
2016: as noted in the Mailbag pages
of this month’s issue, if this circuit
is added to any car it brings about
a dangerous situation whereby the
car’s engine could be inadvertently
be started in any gear. We cannot
recommend that anyone install
this circuit on their car.
Ask SILICON CHIP
. . . continued from page 103
it’s rated for at least 250V DC. Not all
0.25W resistors would necessarily
withstand this. If that still isn’t bright
enough, maybe try 150kΩ or parallel the existing 220kΩ resistor with a
470kΩ resistor.
Deep cycle charger not
working correctly
I built the Charger for Deep Cycle
12V Batteries from the November &
December 2004 issues, mainly because
I had a suitable transformer. But it has
a problem: when I push the Start button it shows the battery type, as if I had
pushed the Set button. I have checked
all wiring and the circuit board, especially around the switches and display.
Everything else is OK and all voltages
measure as correct.
When programming the PIC, I initially used pin 4 as VDD, as shown on
the circuit. As it did not work, I then
connected pins 4 & 14 to +5V and ultimately, after checking the data sheet,
I got it right and used pin 14. The chip
then programmed OK but I feel as if
this is where the fault may lie.
Do you think I should get another
PIC or could it be something else? (P.C.,
Balgal Beach, Qld).
• It is unlikely the PIC is damaged.
Make sure you have the 1nF capacitor
connected to ground from the common switch connections. Check that
diodes D7-D9 are connected the right
way round.
If it still doesn’t work properly, you
could try a new PIC.
Advertising Index
Allan Warren Electronics............ 103
Altronics.........................loose insert
Decibel HiFi.................................. 73
Digi-Key Electronics....................... 3
DSCAPE.................................... 103
Emona Instruments.................... IBC
Using a GPS module
with an enable pin
Front Panel Express..................... 15
I bought and am installing a VK
2828U7G5LF GPS module in the Accurate GPS 1PPS Timebase for Frequency Counters (SILICON CHIP, February 2013).
The data sheet link for this model
states that the yellow lead is designated as “Power Enable”, a point not
mentioned in your original article (and
so I assume it is peculiar to this later
model unit, which also includes status LEDs and is certainly faster). Can
you advise me where to terminate this
lead? (P.S., Warwick, Qld.)
• As noted in the data sheet PDF
with respect to the Power Enable pin:
“a high level means that the module
works, low level means the modules
(sic) is closed”. Therefore, you should
connect the Power Enable pin to the
+3.3V or +5V supply, depending on
what you are using for the circuit. SC
Icom Australia.............................. 11
Next Issue
The June 2016 issue of SILICON
CHIP is due on sale in newsagents
by Thursday 26th April. Expect
postal delivery of subscription copies in Australia between May 26th
and June 3rd.
Hare & Forbes.......................... OBC
Jaycar .............................. IFC,49-56
KCS Trade............................... 28-31
Keith Rippon Kit Assembly ........ 103
LD Electronics............................ 103
LEDsales.................................... 103
Master Instruments.................... 103
Microchip Technology................... 13
Minitech Engineering..................... 6
Monster Electronics...................... 12
Mouser Electronics......................... 5
Ocean Controls.............................. 8
PCBCART...................................... 7
Rohde & Schwarz.......................... 9
Sesame Electronics................... 103
SC Radio & Hobbies DVD............ 89
SC Online Shop............ 39,45,96-97
Silicon Chip Subscriptions........... 95
Silicon Chip Wallchart.................. 35
Silvertone Electronics.................. 14
Tronixlabs.............................. 59,103
WARNING!
SILICON CHIP magazine regularly describes projects which employ a mains power supply or produce high voltage. All such
projects should be considered dangerous or even lethal if not used safely.
Readers are warned that high voltage wiring should be carried out according to the instructions in the articles. When working on these projects use extreme care to ensure that you do not accidentally come into contact with mains AC voltages or
high voltage DC. If you are not confident about working with projects employing mains voltages or other high voltages, you
are advised not to attempt work on them. Silicon Chip Publications Pty Ltd disclaims any liability for damages should anyone
be killed or injured while working on a project or circuit described in any issue of SILICON CHIP magazine.
Devices or circuits described in SILICON CHIP may be covered by patents. SILICON CHIP disclaims any liability for the infringement of such patents by the manufacturing or selling of any such equipment. SILICON CHIP also disclaims any liability
for projects which are used in such a way as to infringe relevant government regulations and by-laws.
Advertisers are warned that they are responsible for the content of all advertisements and that they must conform to the
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104 Silicon Chip
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