This is only a preview of the June 2015 issue of Silicon Chip. You can view 33 of the 96 pages in the full issue, including the advertisments. For full access, purchase the issue for $10.00 or subscribe for access to the latest issues. Articles in this series:
Items relevant to "Bad Vibes Infrasound Snooper":
Items relevant to "Audio Signal Injector & Tracer":
Items relevant to "The Multi-Role Champion Preamplifier":
Articles in this series:
Purchase a printed copy of this issue for $10.00. |
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The July 2015 issue of SILICON
CHIP is on sale in Newsagents by
Thursday 25th June.
Expect postal delivery of subscription copies in Australia between June 22nd and July 3rd.
been damaged. The former is available
from Jaycar or Altronics.
If you’re going to replace those parts
you should inspect all the solder joints
carefully, especially the SMD capacitors, to minimise the chance of another
failure after doing the repair work.
Headphone amplifier
for hearing-impaired
My hearing aids do a reasonable
job of improving intelligibility when
listening to TV or music via an A/V
amplifier and speakers. However, for
private listening via headphones, I
was wondering if you would consider
a project for a small stereo amplifier/
equaliser between the headphone sock-
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et and ’phones which would have an
individually adjustable or programmed
boost response to mirror one’s hearing
loss curves, as programmed into the
hearing aids? What do you think? (T.
S., Tauranga, NZ).
• What do other readers think of
this idea?
LED strobe not
bright enough
I was wondering if you could assist
me. I have built the LED Strobe project (SILICON CHIP, September 2008),
as supplied in kit form by Altronics.
However, the LED does not appear to
be as bright as other 1W LED lights I
use. In fact, it is considerably dimmer.
I have powered the kit from a small
12V sealed lead-acid rechargeable
battery (12V 7.0Ah) to make it portable and re-chargeable. I need to use
the unit in day conditions (not direct
sunlight but still a fair amount of light
where I need to work) and at present
I am limited to pre-dawn and post
sunset operation.
Is there any way to modify it so that
I can increase the LED brightness? (C.
K., via email).
• The 1W LED is being driven with
the correct current, so you may need
to use the 3W white version of the
Luxeon or Cree LED to get more light.
Q1 would need to be replaced with an
IRF540 Mosfet with the gate, drain and
source in the base, collector and emitter connections for Q1 respectively.
The 220Ω resistors from RB4 and
RB5 should be changed to 22Ω. Then
the 3W LED can be driven with higher
current. This requires that the 39Ω 5W
resistor be replaced with two paralleled 22Ω 10W resistors. Additionally,
the 1N4004 diode (D1) needs to be a
SC
1N5404 (3A) diode.
Advertising Index
Altronics.........................loose insert
Emona Instruments........................ 3
Hammond Manufacturing............... 8
Hare & Forbes.......................... OBC
High Profile Communications....... 95
Icom Australia................................ 5
Jaycar .............................. IFC,45-52
KCS Trade Pty Ltd..................... 7,24
Keith Rippon ................................ 95
LD Electronics.............................. 95
LEDsales...................................... 95
Master Instruments...................... 11
Microchip Technology................... 13
Mikroelektronika......................... IBC
National Instruments...................... 9
Ocean Controls.............................. 6
Questronix.................................... 95
Radio, TV & Hobbies DVD............ 88
Sesame Electronics..................... 95
Silicon Chip Binders................ 44,96
Silicon Chip Online Shop........ 34-35
Silicon Chip Subscriptions........... 70
Silvertone Electronics.................. 27
Tronixlabs..................................... 95
Worldwide Elect. Components..... 95
X-ON Electronic Services............ 95
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
Competition & Consumer Act 2010 or as subsequently amended and to any governmental regulations which are applicable.
96 Silicon Chip
siliconchip.com.au
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