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MARKET CENTRE
Cash in your surplus gear. Advertise it here in SILICON CHIP
Announcing Pioneer Hill Software
FOR SALE
SpectraPLUS 24bit DAQ ADC
spectrogram, t.h.d. and i.m.d. analysis, f.f.t,
acoustic tools, 3D surface plot, sig. gen. etc.
Fully shielded SpecctraDAQ200 ADC/DAC
24bit/192kHz dual channel, Wolfson. AKM
converters … USB3 interface to laptop/PC
As 2ch. 24bit recorder t.h.d. = 0.002%max
see : www.spectraplus.com
Order direct, USA contact : John Pattee
(pioneer<at>spectraplus.com)
Local agent : DSCAPE Melbourne
s/w , h/w package ca. USD $1500
Aus. Distributor : Julian Driscoll CEO
jcdrisc<at>tpg.com.au for support
TEKTRONIX 316 10MHz valve oscilloscope. Excellent condition. In use until
1989, then storage, Sydney. Suit collector/restorer. No probes. Best offer above
$140.00. email kim.hague-smith<at>tpg.
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.
CRO & BITS for robotics. BWD 1722 Oscilloscope plus manuals. Assorted motors, cogs, solenoids, magnetic clutches
etc removed from photocopier. Free if
able to pick up. NE Victoria.
tevitarobson<at>gmail.com for details.
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
PCBs MADE, ONE OR MANY. Any format, hobbyists welcome. Sesame Electronics Phone 0434 781 191.
sesame<at>sesame.com.au
www.sesame.com.au
PCBs & Micros: SILICON CHIP can sup-
ply PCBs and programmed microcontrollers and other specialist parts for
recent projects and some not so recent
projects: www.siliconchip.com.au or
phone (02) 9939 3295.
LEDs, BRAND NAME and generic
LEDs. Heatsinks, fans, LED drivers,
power supplies, LED ribbon, kits, components, hardware, EL wire. www.ledsales.com.au
KIT ASSEMBLY & REPAIR
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 re-
quired. Labour fees $35 p/h. Pensioner
discounts available on application. Contact Alan on 0425 122 415 or email bigal
radioshack<at>gmail.com
KEITH RIPPON KIT ASSEMBLY &
REPAIR:
* Australia & New Zealand;
* Small production runs.
Phone Keith 0409 662 794.
keith.rippon<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. Phone
NZ (+64 3) 366 6588 or email dave<at>
davethompson.co.nz
ADVERTISING IN MARKET CENTRE
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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.
Ask SILICON CHIP
. . . continued from page 94
Dog silencer
overheats
I built the Dog Silencer (SILICON
CHIP, July 1999) from an Oatley Electronics kit but I’m having trouble with
siliconchip.com.au
it. The MTP3055 Mosfets on the output amplifier have 1W 10Ω resistors
on their drains which keep overheating and I can’t see why.
I replaced the Mosfets and disconnected the output transformers so
there is no load and still the resistors
cook. The output transformers get hot
too. It’s a simple circuit and shouldn’t
be a problem so any help you can give
us would be appreciated as the dogs
just keep on barking. (T. D., Perth, WA).
• Try connecting a 1N5819 Schottky
diode across each transformer primary
with the cathode to 12V and the anode
to the junction of the 10Ω resistor and
the transformer winding. The diode
will clamp the back-EMF rather than
the 10Ω resistor via the Mosfet. Also,
the frequency could be adjusted for
March 2016 95
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