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PRODUCT SHOWCASE Power amplifier modules from A-One A-One Electronics has specialised in ready-built audio modules for some time and these two are from the top of their Acoustic Fidelity range. First up is a 250W power amplifier module featuring Hitachi 2SJ50 and 2SK135 complementary Mosfets. The input has a trimpot for minimising the DC offset at the output and a heavy duty relay is used to switch the loudspeaker load. This is a high performance amplifier, with a frequency response flat to within ±0.8dB from 3Hz to 20kHz and a rated harmonic distortion of less than 0.03%. Depending on the power transformer used, power output is a maximum of 150 watts RMS into 8W or 250 watts into 4W. The AF-2 module (Cat S-0342) is well priced at $228.00. For those wanting higher power again, module, look no further than the AF-3 module which is rated at 300 watts. It is essentially the same entirely Solid-state pressure sensors SenSym has introduced a new DIP package that will accommodate any of its various pressure sensor die. This small package will allow for assembly onto a PC board via automatic insertion equipment. The package will also conserve board space, since it measures only 0.47 by 0.55 inch with the spacing between the rows of mounting pins only 600 mils. One configuration will allow for 1/2 inch board spacing. The package will support pressure ranges from 4" H2O full scale to to 100 psi full scale and is available in absolute, gauge or differential configurations. These packages were specifically designed for electronic equipment that requires the measurement and control of pressure. Many such applications exist in the medical field such as, ventilators, spirometers and respirators, as well as in pneumatic controls, HVAC and others. Pricing will depend upon the type of sensor die and pressure range but will be competitive with other low cost SenSym sensors. For more information, contact NSD Australia, 205 Middleborough Road, Box Hill, Vic 3128. Phone (03) 890 0970. complementary circuit as in the AF-2 module but with higher supply rails and four each of the Hitachi 2SK135 and 2SJ50 Mosfets. The specifications are the same as before except that the power is upped to 200 watts into 8W and 300 watts into 4W. Price of the AF-3 (Cat S-0343) AUDIOPHILES! Now high audiophile quality components & kits are available in Australia. Buy direct & save. *Kimber, Wonder, Solen & MIT Capacitors *Alps Pots *Holco resistors *High Volt. Cap. *Gold Terminals & RCA *WBT Connectors *Kimber Cables * Interconnect Cables *Output Transformers (standard or customised) *Power Transformers *Semiconductors *Audio Valves & Sockets *Wonder Solder *Welborne Labs Accessories Valve & Solid State Pre-Power Amplifier Kits *Contan Stereo 80 Valve Power Amp. (As per Elect. Aust. Sept. & Oct. ’92) *Welborne Labs Hybrid Preamp. & Solid State Power Amplifier Send $1.00 for Product Catalog PHONE & FAX: (03) 807 1263 CONTAN AUDIO 37 WADHAM PARADE MT. WAVERLEY, VICTORIA 3149. December 1993  87 formed per second. Input impedance is 1 Gohms and inputs are protected against over voltages to 200V. There is also a 4-bit isolated output port provided. The LLAD 140 is a 2/3-length card and comes supplied complete with user manual and utility disc. Interfacing is via a DB-15 connector located on the end of the board. For more information, contact Boston Technology Pty Ltd, PO Box 1750, North Sydney, NSW 2059. Phone (02) 955 4765. Australasian satellite TV book Written by Mark Long and Jeffrey Keating, "The World of Satellite TV" gives a comprehensive description of the technology involved in the delivery of satellite TV. It also explains why some installations need big dishes and gives with actual footprints and transponder loadings for satellites in our region. This second edition of "The World of Satellite TV" has been accepted by many as the best satellite book available. It can be purchased from Dick Smith Electronics, Jaycar Electronics or Peter C. Lacey for $29.90 plus $5 pack and postage. The Australian distributor is Peter C. Lacey Sermodule is $299.00. Both modules are rugged circuits with the well-proven Hitachi Mosfets. Get into them while they last. They're available at A-One Elec troncis Pty Ltd, 432-434 Kent Street, Sydney NSW 2000. Phone (02) 267 4819. Low cost 15-bit 4-channel A/D card Boston Technology Pty Ltd has announced the Australian release of the Low cost PC board prototypes vices Pty Ltd, 80 Dandenong Road, Frankston, Vic 3199. Phone (03) 783 2388. LLAD 140 15-bit 4-channel A/D card for PC/XT/AT/386/486 and compatible computers. The LLAD 140 analog interface has four differential analog input channels, each with 0.25mV resolution over an input range of ±5 volts, with excellent stability and noise immunity. Standard linearity is 0.005%. Reproducibility is ±1 count or better. Readings are accurate to within .025% of full scale at normal operating temperatures, and 7.5 conversions are per- Southern Cross Z80 Computer – ctd from p.68 connects the 10-pin IDC socket with the 25-pin Centronics sub-D male connector using 10-strand flat cable. The other cable connects the 28-pin EPROM socket on the target system to the 28-pin EPROM socket on the emulator board. Two identical 28-pin DIP plug connectors have to be con­nected to either end of the 28-strand flat ribbon cable. You need to decide on the cable length which should ideally be no more than 200mm long. The method of making these cables is described above. The parallel port cable has eight connections as listed in Table 2. Make the 10-pin IDC socket connector first. To do this, match cable strand 1 (usually hatched red colour) to the triangle pin 1 moulded in the IDC socket. Press the socket together, then 88  Silicon Chip lay out the cable and the 25-pin male sub-D connector in front of you. Find pin 1 of the IDC connector and solder the other end of the wire to pin 18 of the sub-D connector. Work through pins 2-8 of the 10-pin IDC connector and solder in all eight connections to the sub-D connector as outlined in Table 2 above. Remember that pin 2 of the IDC header is strand three of the ribbon cable, pin 3 is strand five, pin 4 is strand seven, etc. Finally, fit the sub-D cover onto the 25-pin connector to relieve the strain on the solder connections. Does it work? Connect the EPROM emulator to the Southern Cross computer and to your PC and power both systems up. A new PC board manufacturing service has been set up to meet the demand for small volumes of quality double sided, through hole plated boards. By adopting the latest disposable photo tooling techniques, Don Alan has managed to almost eliminate tooling costs. The resulting prices will challenge bread boarding techniques for prototypes and one off manufacturing. Don claims that prices will range from a quarter of the usual price of other PC board manufacturers. All PC boards are 1.6mm fibreglass, double sided, through hole plated, 35µm copper (1 oz), solder resist and component overlayed. Non rectangular and internal profiles and cut outs Type ‘em scmv1_2.hex’ on the PC keyboard. The Data LED should light up on the emulator for about second, then the Ready LED should turn on, the buzzer should sound and ‘2000’ should appear in the Address displays on the Southern Cross (you may have to press the Reset button). If this is OK, enter ‘em 3digit.hex’. Go to Address 1800 and press Function 0. A 3-digit count should be displayed on the right three displays. It should be possible to increase or decrease the readout with the “+” and “-” keys respectively. All the procedures and software for the emulator are sup­plied on a floppy disc which comes with the kit. The designers suggest that the emulator software be used in conjunction with a program such as Norton Commander for most efficient creation of code for SC the Southern Cross. are available. All artwork must be a Protel Easytrax or Autotrax file. A free design kit is available that includes a hole size guide, Protel Easytrax (Freeware) PC board layout software for the PC, a program that checks and quotes your PC board file, design data and a tutorial for those who are using a computer to lay out PC boards for the first time. Files may be delivered by 1200 or 2400 Baud modem, 24 hours a day. Modem number (08) 373 5489. For further information, contact Donald Kay, Don Alan Electronics, PO BOX 404, Brooklyn Park, SA 5032. phone (08) 43 3957. New Scope desoldering tool This new solder sucker from Scope Laboratories uses a tough seethrough plastic which helps you see when to clean out excess solder. It will be available shortly from your normal Scope stockists. For further information, contact Scope Laboratories, PO Box 63, Niddrie, Vic 3042. Phone (03) 338 1566. 100MHz digital storage oscilloscope Featuring sampling speeds of 100Ms/sec on two channels in single shot mode, or 10Gs/sec on all four channel in repetitive mode, the DL1300A offers up to double the sampling speed of Yokogawa's DL1200A model by increasing the acquisition memory to 64K per channel. A fast screen update rate allows the DL1300A to display incoming waveforms in real time, while simultaneously displaying up to a 1000 times expanded segment of the same waveform, also in real time. The display is a high resolution amber raster scan CRT. Several levels of brightness allow adjustable contrast between waveforms, measurements and the screen grid. The standard DL1300A is provided with a GPIB interface, external trigger, and clock interface which allows synchronisation of the timebase to an external signal such as a data clock or shaft encoder. Options include a thermal printer, an RS232C communications port, and a memory card interface which can store and recall front panel setup and waveform data. A video option is also available, allowing a standard video monitor to display the DL1300A screen. Automatic measurement facilities are provided including RMS voltage, peak to peak voltage, frequency and rise/fall times. Two channels may also be tested by a GO/NOGO function, with the result causing waveform capture or an automatic hard copy printout. For further information, contact Tony Richardson, Yokogawa Australia Pty Ltd, Centrecourt D3, 25-27 Paul St North, North Ryde, NSW 2113. Phone (02) 805 0699. December 1993  89