Project Solutions

I²C-homebus: Switch power outlets with your PC 2

Published:2011/8/16 6:14:00 Author:Amy

Paul Goossens Construction The printed circuit board designed for the circuit (Figure 2) has a spacious layout with all connectors carrying mains voltages conveniently located at one side. Mounting the components onto the board is not expected to cause problems. However, do pay attention to the orientation of polarized components like electrolytic capaci­tors, LEDs and ICs. (View)

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I²C-homebus: Switch power outlets with your PC 1

Published:2011/8/16 3:20:00 Author:Amy

Paul Goossens This unit, in combination with the USB/I2C interface described elsewhere in this issue, may be used to switch four mains-powered devices on and off via the PC. Eight of these modules may be connected to a single interface, allowing up to 32 loads to be controlled. The system is ideal for a small home bus! Triggered by other articles on home automation in this issue, yo...   (View)

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READY, STEADY, Fatty-Body Fat Monitor Scales （2）

Published:2011/8/16 2:23:00 Author:Phyllis

By David Daamen Operation BIA is based on the difference in conductivity between fatty and lean tissue in the body. A constant alternating current is fed through the body via two electrodes, with one placed underneath each foot. Typical values are about 800 uA and 50 kHz. The resulting voltage is measured using two different electrodes, also placed underneath the feet (Figur...   (View)

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Delphi for electronic engineers: Part1-the first steps （3）

Published:2011/8/16 2:18:00 Author:Li xiao na

Detlef Overbeek ＆ Anton Vogelaar Second program - a digital clock The next example shows how we can create a program to display a digital clock, using Delphi. We’ll assume that you are now familiar with all the proc...   (View)

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READY, STEADY, Fatty-Body Fat Monitor Scales （1）

Published:2011/8/16 2:15:00 Author:Phyllis

By David Daamen iSensible people look after their health: no smoking, moderate drinking, regular exercise and a healthy diet. And of course you want to keep an eye on your condition, for example with scales that also show your body fat percentage. Perhaps you already have one of these at home, but how do they work? It wasn’t that long ago when the body weight was the most important ...   (View)

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REMOTE TEMPERATURE LOGGER FOR PIC 18F BOARD

Published:2011/8/16 2:03:00 Author:Phyllis

Using a DS 1820 1-wire temperature sensor By Peter Moreton In this short article, we describe how to bit-bang a DSl8B20 or DSl8S20 temperature sensor device using PIC firmware written in ’C, and output the temperature values to the RS232 port, for logging on a PC, all using the PIC1 8Flash Development Board published last month. The PIC18Flash development board described in ...   (View)

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Delphi for electronic engineers: Part1-the first steps （2）

Published:2011/8/16 1:45:00 Author:Li xiao na

Detlef Overbeek ＆ Anton Vogelaar Altering the settings The possibility of losing programs can be much reduced by altering o few settings within ihe IDE. From the menu click on Tools/Environment Options. In the Autosave options tick Editor files and Project desktop. The Delphi settings are then stored when you exit. When Delphi is started again, the IDE will look exactly the ...   (View)

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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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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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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… 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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