MARKET CENTRE
Cash in your surplus gear. Advertise it here in SILICON CHIP
Where do you get those
HARD-TO-GET PARTS?
FOR SALE
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
Where possible, the SILICON CHIP On-Line
Shop stocks hard-to-get project parts,
along with PCBs, programmed micros,
panels and all the other bits and pieces
to enable you to complete your
SILICON CHIP project.
SILICON CHIP
LEDs, BRAND NAME and generic
LEDs. Heatsinks, fans, LED drivers,
power supplies, LED ribbon, kits, components, hardware, EL wire. www.ledsales.com.au
tronixlabs.com - Australia’s best value
for hobbyist and enthusiast electronics
from adafruit, DFRobot, Freetronics,
Raspberry Pi, Genuino and more, with
same-day shipping.
PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191.
sesame<at>sesame.com.au
www.sesame.com.au
WANTED
WANTED: EARLY HIFIs, AMPLIFIERS,
Speakers, Turntables, Valves, Books,
Quad, Leak, Pye, Lowther, Ortofon,
SME, Western Electric, Altec, Marantz,
McIntosh, Tannoy, Goodmans, Wharfe
On-Line SHOP
www.siliconchip.com.au/shop
dale, radio and wireless. Collector/
Hobbyist will pay cash. (07) 5471 1062.
johnmurt<at>highprofile.com.au
KIT ASSEMBLY & REPAIR
KEITH RIPPON KIT ASSEMBLY &
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
p erience 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 custom design work. No job too small. Based
in Christchurch, NZ but service available Australia/NZ wide. Email dave<at>
davethompson.co.nz
ADVERTISING IN MARKET CENTRE
Classified Ad Rates: $32.00 for up to 20 words plus 95 cents for each additional word. Display ads in Market Centre (minimum 2cm deep, maximum 10cm deep): $82.50 per column centimetre per insertion. All prices include GST.
Closing date: 5 weeks prior to month of sale. To book, email the text to silicon<at>siliconchip.com.au and include your
name, address & credit card details, or phone Glyn (02) 9939 3295 or 0431 792 293.
worth testing the complete backpack/
sensor using a lab power supply or by
using alternative USB supplies such as
a computer's USB outlet.
Fixed frequency
Ultrasonic Cleaner
Could you please put me in touch
someone experienced in writing the
source code for PICs. I am especially
interested in the code used for Ultrasiliconchip.com.au
sonic Cleaner project (August 2010).
I would like to discuss whether there
is a simple way of modifying source
code to generate a single frequency
output from the transducer. I would
appreciate very much your help and
support. (M. T., Vic)
• We do have a version that runs
at either 28kHz continuously or
40kHz continuously. The frequency
is changed from one to the other by
holding the start switch pressed when
the ultrasonic cleaner is powered up.
The ASM and HEX files are available
upon request.
If you are after different frequencies,
you can compare the values for each
frequency shown in the lookup table
that is labelled SWEEP1 and SWEEP2
with those used in the original assembler file “ultrasonic cleaner.asm”,
which is available for download from
our website. See www.siliconchip.
com.au/Shop/?article=244
SC
April 2017 95
