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Cash in your surplus gear. Advertise it here in SILICON CHIP
FOR SALE
PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191.
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www.sesame.com.au
tronixlabs.com - Australia’s best value
for hobbyist and enthusiast electronics
from adafruit, DFRobot, Freetronics,
Raspberry Pi, Seeedstudio and more,
with same-day shipping.
LEDs, BRAND NAME and generic
LEDs. Heatsinks, fans, LED drivers,
power supplies, LED ribbon, kits, components, hardware, EL wire. www.ledsales.com.au
PCB MANUFACTURE: single to multi
layer. Bare board tested. One-offs to
any quantity. 48 hour service. Artwork
design. Excellent prices. Check out our
specials: www.ldelectronics.com.au
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recent projects and some not so recent
projects: www.siliconchip.com.au or
phone (02) 9939 3295.
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REPAIR:
* Australia & New Zealand;
* Small production runs.
Phone Keith 0409 662 794.
keith.rippon<at>gmail.com
VINTAGE RADIO REPAIRS: electrical mechanical fitter with 36 years ex
perience and extensive knowledge of
valve and transistor radios. Professional
and reliable repairs. All workmanship
guaranteed. $10 inspection fee plus
charges for parts and labour as required. Labour fees $35 p/h. Pensioner
discounts available on application. Contact Alan on 0425 122 415 or email bigal
radioshack<at>gmail.com
DAVE THOMPSON (the Serviceman
from SILICON CHIP) is available to help
you with kit assembly, project troubleshooting, general electronics and
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WANTED: EARLY HIFIs, AMPLIFIERS,
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SME, Western Electric, Altec, Marantz,
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dale, radio and wireless. Collector/
Hobbyist will pay cash. (07) 5471 1062.
johnmurt<at>highprofile.com.au
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. . . continued from page 94
motor and is controlled by a boost
sensor which has a cut-in adjustable
between 6 and 30 psi and a maximum
output adjustable between 10 and 100
psi. My problem is that in reality it
doesn’t engage until 8 psi, leaving me
to have to push the vehicle harder to
get the effect of the system.
I was hoping to be able to wire this
motor speed controller in parallel
with the boost controller to enable
siliconchip.com.au
me to override the system and dial in
a desired amount of methanol/water
when conditions require it, while still
allowing the boost switch to take over
on steep climbs.
I have assembled the kit and installed it after performing the tests described in the instructions. It returned
pretty much the figures quoted and
gives me a range of almost zero to 12V
when I turn the potentiometer (Jaycar
supplied me with a potentiometer
with the same value as the trimpot).
The result when I flick my switch on
however is full pressure which does
not alter as I adjust the control and
when I drive the vehicle at boost level
the boost controller fails to take over.
I initially installed D2 and C3 at
the motor and thought maybe this
was affecting the boost controller so I
tried moving them closer to the circuit
board, leaving two separate parallel
circuits to the motor, but this seems
to make no difference.
I have retested the output voltage at
the circuit board while installed in the
car and get the correct results. Is what
I’m trying to do not possible or do I
. . . continued on page 104
December 2015 103
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