MARKET CENTRE
Cash in your surplus gear. Advertise it here in SILICON CHIP
KEEP YOUR COPIES OF
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
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
SILICON CHIP
AS GOOD AS THE DAY
THEY WERE BORN!
ONLY
95
$
1P6LUS
p&p
A superb-looking
SILICON CHIP
binder will keep
your magazines in
pristine condition.
* Holds up to 14 issues
* Heavy duty vinyl
* Easy wire inserts
ORDER NOW AT
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.
Where do you get those
HARD-TO-GET PARTS?
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
On-Line SHOP
www.siliconchip.com.au/shop
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.
Ask SILICON CHIP
. . . continued from page 102
600mA, as set by R1 and RCL from Table 1) into the cell capacity (in mAh)
and multiply by 1.5 for the charge time
in hours. For example, for 2000mAh
cells and a 200mA charging current,
2000mAh / 200mA x 1.5 = 15 hours.
A 9V (8.4V) battery has seven cells
so VR1 would be set for 7 x 1.35V =
9.45V at the output. The required insiliconchip.com.au
put voltage will need to be at least 3V
above this to allow for diode D1’s forward voltage drop, the dropout voltage of REG1 and the voltage across R1
and RCL. So about 12.5V is required.
Charge time for NiMH batteries can
vary as it depends on the charge current.
A fast charge is five hours and trickle
charge, 15 hours. Cell temperature can
rise well above ambient with fast charging so normally, a charger should have
temperature monitoring if you want to
charge faster than the five hour rate.
Remote Control
Extender not working
I built the Infrared Remote Control
Extender described in the October 2006
issue around that time and it has given
faultless service until now. I recently
upgraded to the Foxtel HD iQ3 system.
The extender no longer works. I have
operated the frequency pot through its
range without result. Every other remote control still keys the LED.
. . . continued on page 104
December 2016 103
