Project Solutions (2011/08/15)
Index
EL156 AUDIO POWER AMPLIFIER Return of a legend （4）
Published:2011/8/15 22:42:00 Author:Phyllis
By Gerhard Haas Switching off When the amplifier is turned off, there is no longer any voltage present on the transformer. The transformer voltage is monitored continuously by D5 and D6 (13 V operation) or by D5 and D7 (6.3 V operation). If the voltage is not present, the relay drops out immediately. Diodes D... (View)
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USB/I²C INTERFACE I-square-C rules… 4
Published:2011/8/15 22:40:00 Author:Amy
Paul Goossens Get to work with Word In the June edition of Elektor Electronics we showed how the well-known word processor MS-Word could also be used to write your own programs. Since most Windows users have a copy of this word processor, it made sense to show you a simple example,... (View)
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EL156 AUDIO POWER AMPLIFIER Return of a legend （3）
Published:2011/8/15 22:37:00 Author:Phyllis
By Gerhard Haas Rattle and hum When the output stage is switched on and while it is warming up the various reservoir and coupling capacitors may charge at different rates. This can give rise to hum and nimble. The circuit in Figure 3 can suppress these sounds effectively. The normally-c... (View)
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EL156 AUDIO POWER AMPLIFIER Return of a legend （2）
Published:2011/8/15 22:30:00 Author:Phyllis
By Gerhard Haas It is not possible to build an ultra-linear amplifier using the EL156 with a high anode voltage. The same goes for the EL34. The output transformer is therefore connected in such a way that the impedance of the grid connection to the output valve is much lower than in conventional valve circuits, and c... (View)
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EL156 AUDIO POWER AMPLIFIER Return of a legend （1）
Published:2011/8/15 22:24:00 Author:Phyllis
By Gerhard Haas Thanks to its robustness, the legendary EL156 audio power pentode has found its way into many professional amplifier units. Its attraction derives not just from its appealing shape, but also from its impressive audio characteristics. We therefore bring you this classical circuit, updated using high-quality modern components. The EL156 was manufactured in the legendar... (View)
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USB/I²C INTERFACE I-square-C rules… 3
Published:2011/8/15 22:24:00 Author:Amy
Paul Goossens This completes the trickiest part of the construction. An example of a suitable module that can be connected to the interface is shown in the PC Home Bus article. If you prefer to use the I2C bus without the I2C bus-extender, you should make the following modifications: IC5, Rll and R12 can be left out. Pins 3 and 2 on IC5 have to be connected together, as ... (View)
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USB/I²C INTERFACE I-square-C rules… 2
Published:2011/8/15 22:09:00 Author:Amy
Paul Goossens Interface The interface we’ve designed should satisfy several requirements. We would like to keep the installation under Windows as easy as possible. What’s more, it should be (relatively) easy to control the interface. It would also be nice if we could run longer cables between the interface and I2C modules, so the user can connect devices that are a long way away ... (View)
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USB/I²C INTERFACE I-square-C rules… 1
Published:2011/8/15 21:58:00 Author:Amy
Paul Goossens Since the introduction of the l2C bus in the eighties by Philips it has been used many times to provide a simple connection between a PC and home-built circuits. This often made use of a simple interface connected to the parallel port of the PC. This now seems a bit dated, so we’ve designed a USB/I2C i... (View)
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Delphi for electronic engineers: Part1-the first steps （1）
Published:2011/8/15 20:53:00 Author:Li xiao na
Detlef Overbeek ＆ Anton Vogelaar This article is the first part in a series about programming in Delphi, which concentrates on the practical side of programming and how it can interact with hardware. As an example, how would you write a Delphi program under Windows and then transfer it to an IC to make an autonomous Delphi controller? Delphi is a programming environment based on... (View)
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IR Transmitter with HT12E
Published:2011/8/15 20:27:00 Author:Amy
Peter Verhoosel IR (infra-red) transmitters containing the encoder-IC HT12E from Holtek have been published in Elektor Electronics on previous occasions. The interesting aspect of this design is that the entire IR-transmit... (View)
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Stable Filament Supply
Published:2011/8/15 2:09:00 Author:Amy
Dr Alexander Voigt Valves are enjoying increasing popularity in audio systems. With the European ’E’ series of valves, such as the ECC83 (12AX7) and EL84 (6BQ5), the filament voltage is 6.3 V. Depending on how the circuit is wired, the ECC 81 -83 series of twin triodes can also be used with a filament voltage of 12.6 V. In earlier times, the filament voltage was usually taken dire... (View)
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Modern SMD Packing
Published:2011/8/15 1:53:00 Author:Amy
Paul Goossens Parts in SMD packages are becoming more and more frequent in DIY circuits. Sometimes they are used because of better performance, usually as a consequence of the shorter (View)
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SATA
Published:2011/8/15 1:34:00 Author:Amy
Karel Walraven There is a new standard these days for connecting hard disks and DVD drives: SATA. You may already have noticed that new PCs don’t contain the wide 40- or 80-pin ribbon cables any more, but the hard disk is connected with a slender... (View)
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ATX Power Supply Tester: check all voltages （3）
Published:2011/8/15 1:03:00 Author:Li xiao na
By Ton Giesberts Construction The PCB designed for the tester is shown in Figure 3. The dimensions of the PCB have been kept as small as possible and are not based on any particular enclosure. The ATX power supply connector is on the edge of the PCB, so that this can stick out through the side of an enclosure. This makes it much easier to insert the connector from an ATX power s... (View)
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