This is only a preview of the August 1995 issue of Silicon Chip. You can view 31 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. Items relevant to "Vifa JV-60 2-Way Bass Reflex Loudspeaker System":
Items relevant to "A Gain-Controlled Microphone Preamp":
Articles in this series:
Items relevant to "Build The Mighty-Mite Powered Loudspeaker":
Items relevant to "Computer Bits":
|
PRODUCT SHOWCASE
Car power amplifiers
from Kenwood
Kenwood has just released three
new car stereo amplifiers with balanced inputs and power FET technology. Designated the KAC-PS200
(100 watts/channel), KAC-PS150 (75
watts/channel) and the KAC-PS100
(50 watts/channel) they all feature
Kenwood's TRI-Mode operation.
This allows them to be configured
for three modes of operation: standard two channel stereo mode, mono
bridged mode or using a passive network such as Kenwood's KPX-T120
for stereo operation plus a subwoofer
channel.
This series is designed to operate
with Kenwood cassette/CD/receivers
or control units and can be mounted
either horizontally or vertically in the
boot. Cooling fans are incorporated in
the 100W and 75W units.
Audio Lab
The two higher power units incorporate a variable low pass filter,
the 50 watt unit a fixed 80Hz filter,
for use with the subwoofer configuration.
The use of balanced inputs allows
the units to be placed in the boot without the signal degradation and noise
problems which can be experienced
with long, unbalanced inputs.
All models are covered by 12
months warranty and are available at
selected Kenwood car audio dealers.
For further information on these or
any other Kenwood products contact
Kenwood by phoning (02) 764 1888.
The Schaffner range of PC mounting
filters has been extended with the introduction of the FN402 and FN402B
family. The latter series has extremely
Complete Audio Lab kit with PCBs, 1% resistors, PTH screened PCBs, IC sockets,
boot Eprom, screen printed case, 8K RAM, 8031 processor and all ICs.
Includes calibration and Audio Lab V5.1 software
$330 inc. tax.
Processor test kit $15.
Freight $9.
Fully assembled & calibrated complete with plugpack (1-year warranty) $450
5 Ludwig Place, Duncraig, Perth WA 6023
86 Silicon Chip
Electrolytic capacitor
mounts for PC boards
PC mount
mains filters
R.S.K. Electronics Pty. Ltd.
10 VAC 1A plugpack plus socket $18.
2-Metre serial cable $9.
low leakage and is mainly intended for
medical applications.
These units can be used for nominal
voltages up to 250VAC, 50Hz or 60Hz,
and come in current ratings of 0.5, 1.0,
1.6, 2.5, 4.0 and 6.5A. All filters are
suitable for installation in business
machines where IEC950 requirements
must be met.
For further information, contact
John Thompson, Westinghouse Industrial Products, 175-189 Normanby Rd, South Melbourne, Vic 3205.
Phone (03) 9676-8888 or fax (03)
9676-8777.
Phone (09) 448 3787
These plastic mounts provide support for PC mount electrolytic capacitors and come in five standard sizes.
Each mount features a slotted cup
which supports and insulates the capacitor from surrounding components
while allowing venting and proper
drainage of fluids or contaminants
experienced during board assembly
and washing. Each mount raises the
capacitor 1.3mm above the board
surface.
For further information, contact
M. Rutty & Co, 1/38 Leighton Place,
Hornsby, NSW 2077. Phone (02) 476
4066.
FM radio trainer
now available
We have recently reviewed
sample versions of the kit from
Dick Smith Electronics for the
FM Radio Trainer project featured in the April & May 1995
issues of Silicon Chip.
The DSE kit has a well finished screen-printed PC board
and comprehensive assembly
and alignment instructions.
The lab staff at Dick Smith Electronics have made a number of
minor changes to the design,
to optimise performance with
some slightly different components that have been substituted because of availability
problems.
Having compared their kit
versions with our prototype,
we are happy to report they
perform equally as well.
The FM Radio Trainer kit is
available from all Dick Smith
Electronics stores at $69.95.
(Cat K-5026).
Surface mount
240V Mosfet
Zetex has released surface
mount 240V Mosfet for telecommunications equipment.
Offering a low threshold voltage and low on-resistance, the
ZVP4424G is supplied in an
SOT223 package.
With a gate-source voltage of
3.5 volts and a drain current of
100mA the device features an
on-resistance of 12W. It also
exhibits typical rise times of
8ns and fall times of 20ns at
currents of 250mA, making it
an efficient solution in telephone recall, hook and dialling
applications. The ZVP4424G also
features a typical input capacitance
of 100pF and a gate to source voltage
rating of ±40V.
The surface mounting version is
capable of handling a continuous
drain current of 480mA and up to
1A pulsed. Its maximum power
dissipation is 2.5W at 25 degrees
C. A comprehensive data sheet is
available, outlining full Spice model
parameters, for computer simulation
and testing.
For more information, contact GEC
Electronics Division,Unit 1, 38 South
St, Rydalmere, NSW 2116. Phone (02)
638 1888 or fax (02) 638 1798.
High voltage transistor
for electronic ballasts
Philips Semiconductors have released the BU1706A, a silicon diffused
NPN power transistor which they
claim is a practical low cost alternative
to power Mosfets in electronic lighting
ballasts.
A peak collector emitter voltage
of 1750V and low switching losses
allow this new transistor to be used
in applications where power Mosfets
are prone to failure, for example, in
mains voltage switching.
Fall times as low as 0.2µs with inductive loads and a Vce(sat) of 1.0V
at 1.5A allow the BU1706A to operate
with little or no heatsinking in high
frequency switching circuits. The
transistor is available in the standard
TO220 package or the fully isolated
SOT186A pack.
For more information, contact Karen
August 1995 87
PCB POWER
TRANSFORMERS
1VA to 25VA
Programmable laser
scanning system
Rack mounting work
station has touchscreen
For concert and live music applications, the model XYP-1000 Beamscan
system is a complete, self-contained,
microprocessor controlled laser scanning system.
It is capable of producing a very
wide variety of patterns, automatic
pattern sequences and beam effects.
The system consists of a digital controller, scanner head and connecting
cable.
The controller uses a 20-key membrane keypad for programming and
recalling patterns and sequences. A
backlit two line by 16 character display
is used for verification. Its 8K EEPROM
will store 100 user created patterns and
up to 360 sequence frames. The system
comes programmed with 80 patterns
and 20 beam effect sequences.
The scanner head contains an open
loop X/Y scanner pair, a high speed
beam shutter, a diffraction grating with
actuator and a connector for the control cable. The head has IN and OUT
beam ports 90 degrees apart.
Programmed sequences are played
back much like a slide show, displaying each frame at a programmed position, for a preset time. Frames can also
be advanced by a music trigger using
an external sound source to one of the
three line level inputs.
For further information, contact
Spectrum Laser Systems, PO Box 384,
Bentleigh, Vic 3204. Phone (03) 9532
1981 or fax (03) 9555 7449.
Click Electronics have recently
released a rack mounting workstation with a built-in touchscreen. The
touchscreen is supplied with drivers
for DOS or Windows 3. For use with
software that does not have a touch
screen interface, it can emulate a
mouse.
The workstation has a sealed front
panel, with an integral 83 key membrane keypad which includes 24 function keys. The unit can accommodate
one 3.5" floppy drive, as well as two
3.5" half height, hard disc drives. The
built-in 14" 0.26mm dot pitch VGA
colour monitor offers a screen resolution of 1024 X 768.
A seven slot AT-ISA passive backplane is mounted, along with the disc
drives, in a drawer, which slides out
from the rear of the work station, for
easy access. The card bay is fitted
with an anti-vibration clamp. The
station offers a range of single board
computers, from the low cost 486DLC
to the high performance 486DX4-100.
A 250W power supply is provided to
support any configuration.
For more information, contact Click
Electronics, PO Box 25, Bangor, NSW
2234. Phone (02) 649 6011 or fax (02)
649 6887.
ised data collection system.
Each Aspnet terminal has a keypad, liquid crystal data display and
an inbuilt battery (in case of external power failure.) Operators can be
prompted to enter information
or can be given instructions on
what to do. Information collected by the system is stored
with time and date stamp.
Data can easily be transferred
to a spreadsheet, database or
customised analysis software
as required.
For larger operations, the system can be extended by the use
of a "workblock" which allows
the program to collect data from
a larger number of sources.
For more information, contact
Carli Barnes, ASP Microcomputers,
456 North Road, Ormond, Vic 3204.
Phone (03) 9578 7600 or fax (03)
9578 7727.
Manufactured in Australia
Harbuch Electronics Pty Ltd
9/40 Leighton Pl. HORNSBY 2077
Ph (02) 476-5854 Fx (02) 476-3231
Hillerman, Philips Components, 34
Waterloo Rd, North Ryde, NSW 2113.
Phone (02) 805 4479 or fax (02) 805
4466.
Low-cost production
tracking system
A new low cost system has been
released by ASP Microcomputers,
to allow business to gain the advantages of real time production
tracking and time costing.
The Aspnet hardware consists
of miniature readers which accept
information from barcodes or
magnetic stripes. These readers
are connected via a network to
a host computer which analyses
incoming data as it is received. In
addition, the system incorporates
an easy to use computer language,
Aspnet Basic, which allows users
to create their own fully custom88 Silicon Chip
Interface boards for connecting
Windows PCs to serial devices
National Instruments has
announced two new interface
boards that connect windows
PCs to serial devices. The AT485 and AT-232 connect the
PC to RS-485 and RS-232 instruments respectively, giving
the PC additional serial ports
with data transfer rates up to
115.2KB/s. Both boards are
available in two and four port
configurations. These are the
first National boards to use the
jumperless "Plug and Play" ISA
architecture. For users of Windows 3.1, which does not
offer this facility, a board configuration utility is supplied.
The AT-485 can connect up to 31 multi-dropped devices
to a single PC port. It also includes a special automatic
transceiver mode that can communicate with two wire
serial devices.
The AT-232 can connect laboratory or electronic test
instruments, such as oscilloscopes and multimeters, to
a PC. Users can communicate with the boards using National Instruments' LAB software or any other industry
standard programming languages.
For more information, contact Tony O'Donnell, National
Instruments Australia, PO Box 466, Ringwood, Vic 3134.
Phone (03) 9879 9422 or fax (03) 9879 9179.
KITS-R-US
PO Box 314 Blackwood SA 5051 Ph 018 806794
TRANSMITTER KITS
$49: a simple to build 2.5 watt free running CD level input, FM band runs from 12-24VDC.
•• FMTX1
FMTX2B $49: the best transmitter on the market, FM-Band XTAL locked on 100MHz. CD level input 3
stage design, very stable up to 30mW RF output.
$49: a universal digital stereo encoder for use on either of our transmitters. XTAL locked.
•• FMTX2A
FMTX5 $99: both FMTX2A & FMTX2B on one PCB.
FMTX10 $599: a complete FMTX5 built and tested, enclosed in a quality case with plugpack, DIN input
•connector
for audio and a 1/2mtr internal antenna, also available in 1U rack mount with balanced cannon
input sockets, dual VU meter and BNC RF $1299. Ideal for cable FM or broadcast transmission over
distances of up to 300 mtrs, i.e. drive-in theatres, sports arenas, football grounds up to 50mW RF out.
FMTX10B $2599: same as rack mount version but also includes dual SCA coder with 67 & 92KHz
subcarriers.
•
AUDIO
Audio Power Amp: this has been the most popular kit of all time with some 24,000 PCBs being
•soldDIGI-125
since 1987. Easy to build, small in size, high power, clever design, uses KISS principle. Manufacturing
rights available with full technical support and PCB CAD artwork available to companies for a small royalty.
200 Watt Kit $29, PCB only $4.95.
AEM 35 Watt Single Chip Audio Power Amp $19.95: this is an ideal amp for the beginner to construct;
uses an LM1875 chip and a few parts on a 1 inch square PCB.
Low Distortion Balanced Line Audio Oscillator Kit $69: designed to pump out line up tone around studio
complexes at 400Hz or any other audio frequency you wish to us. Maximum output +21dBm.
MONO Audio DA Amp Kit, 15 splits: $69.
Universal BALUN Balanced Line Converter Kit $69: converts what you have to what you want, unbalanced
to balanced or vice versa. Adjustable gain. Stereo.
•
•
••
COMPUTERS
I/O Card for PCs Kit $169: originally published in Silicon Chip, this is a real low cost way to interface
•to Max
the outside world from your PC, 7 relays, 8 TTL inputs, ADC & DAC, stepper motor drive/open collector
1 amp outputs. Sample software in basic supplied on disk.
PC 8255 24 Line I/O Card Kit $69, PCB $39: described in ETI, this board is easy to construct with
•onlyIBM3 chips
and a double sided plated through hole PCB. Any of the 24 lines can be used as an input or
output. Good value.
19" Rack Mount PC Case: $999.
•• Professional
All-In-One 486SLC-33 CPU Board $799: includes dual serial, games, printer floppy & IDE hard disk drive
interface, up to 4mb RAM 1/2 size card.
PC104 486SLC CPU Board with 2Mb RAM included: 2 serial, printer, floppy & IDE hard disk $999; VGA
•PC104
card $399.
KIT WARRANTY – CHECK THIS OUT!!!
If your kit does not work, provided good workmanship has been applied in assembly and all original parts
have been correctly assembled, we will repair your kit FREE if returned within 14 days of purchase. Your
only cost is postage both ways. Now, that’s a WARRANTY!
KITS-R-US sell the entire range of designs by Graham Dicker. The designer has not extended his agreement
with the previous distributor, PC Computers, in Adelaide. All products can be purchased with Visa/Bankcard
by phone and shipped overnight via Australia EXPRESS POST for $6.80 per order. You can speak to the
designer Mon-Fri direct from 6-7pm or place orders 24 hours a day on: PH 018 80 6794; FAX 08 270 3175.
August 1995 89
|