Project Solutions

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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Battery Charging on USB （2）

Published:2011/8/14 23:29:00 Author:Phyllis

By Harry Baggen Professional products Various semiconductor manufacturers have now developed special products for charging batteries using a USB port. Some of them are intended lo be used for charging lithium-ion batteries, but that’s not particularly interesting for DIY circuits, due to the difficulty of obtaining that type of battery. Maxim has developed an idea for pow...   (View)

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Battery Charging on USB （1）

Published:2011/8/14 23:02:00 Author:Phyllis

By Harry Baggen Besides being handy for connecting and disconnecting equipment while the computer is running, USB includes a built-in supply line that can provide a certain amount of power to connected devices. That can be handy for quickly charging a battery when you can’t find a real charger. Nowadays every...   (View)

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BRING OUT YOUR DEAD-Solutions to electronic waste （4）

Published:2011/8/14 22:38:00 Author:Phyllis

By Chris Bayliss And West again.. Absorbing the cost of recycling the product may not prove to be a popular option with the European consumer. Avoiding added cost means returning to the drawing board and thinking about the design process. (View)

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ATX Power Supply Tester: check all voltages （2）

Published:2011/8/14 22:34:00 Author:Li xiao na

By Ton Giesberts A look at the circuit An ATX power supply has a total of 6 output voltages, which all have to be tested: +3.3 V, +5 V, +5 V for standby. +12 V. +5 V and +12 V. The standby voltage (-5VSB) is always present as long as the mains is connected. This voltage is therefore used as the supply for the tester (Figure 1). LED Dl is driven directly from...   (View)

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BRING OUT YOUR DEAD-Solutions to electronic waste （3）

Published:2011/8/14 22:23:00 Author:Phyllis

By Chris Bayliss Designing for minimum waste The Fraunhofer Institute has developed a software product to assist the electronics designer. The software-based IZM/EE Toolbox (Figure 2) enables the electronics designer to investigate a range of areas from toxicity and recyclability of a design to more abstract areas such as the energy required to produce the raw mater...   (View)

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Low-Drop Constant Current Source: for Ultrabright LEDs

Published:2011/8/14 22:15:00 Author:Amy

Olaf Konig Ultrabright LEDs are becoming increas­ingly attractive for use in lighting and warning-signal applications. LEDs must be operated at a constant current to ensure that...   (View)

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BRING OUT YOUR DEAD-Solutions to electronic waste （2）

Published:2011/8/14 22:11:00 Author:Phyllis

By Chris Bayliss Electronic Data Logging (EDL) Researchers at the power tool manufacturer Bosch have made a suggestion that may help to overcome the above (quite natural) fear, the Electronic Data Logging (EDL) device. EDL records general information ranging from life hours of the product to more speci...   (View)

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ATX Power Supply Tester: check all voltages （1）

Published:2011/8/14 22:08:00 Author:Li xiao na

By Ton Giesberts PC power supplies can often be bought cheaply at places such as computer fairs. But it isn’t that easy to check if such a (second hand) power supply. This dedicated tester makes that job quick and straight forward. Apart from the power supply and this tester, you’ll only need a mains cable (and socket!). All outputs from the power supply can be ...   (View)

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BRING OUT YOUR DEAD-Solutions to electronic waste （1）

Published:2011/8/14 21:53:00 Author:Phyllis

By Chris Bayliss In 2006 European legislation on electrical and electronic waste comes into full force. Across North America, states are passing laws to deal with electronics waste. These measures reflect a hidden but growing problem. As any electronics enthusiast who has recently tried to repair a consumer product will know, it is more likely to be cheaper to dispose of and replace...   (View)

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Resistor-Equipped Transistors （RETs）

Published:2011/8/14 21:21:00 Author:Amy

Paul Goossens Developments in the electronics area (or is it an arena?) are never at a standstill. Whenever there is something substantially new to report it is almost always related to complex chips. However, Philips proves that new developments are possible even with what you thought were dead-standard components. For example, take the new range of transistors with the name ’RET’ -mean...   (View)

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WHISTLE BEACON

Published:2011/8/14 21:21:00 Author:Li xiao na

Model aircraft sometimes have the unpleasant property of choosing their own landing field, and doing so in terrain where they are hard to see. In such cases, the model finder described here can make the search easier. An unplanned landing is already bad enough, but to make matters worse, it sometimes happens in a cornfield. That often means searching crisscross through the field for sev...   (View)

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PICXEX18 AND PlCWIN8- Operating System and Monitor for PIC Microcontrollers （3）

Published:2011/8/14 21:04:00 Author:Phyllis

By Lourens le Grange Figure 4 gives the basics of a timer interrupt service routine (which is your code) containing a call to the subroutine SCHEDOO. The following execution rates (in ms) are available for Time Tasks: 10,20,40,50, 100,200 (View)

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Model Railway Short-Circuit Beeper

Published:2011/8/14 21:04:00 Author:Amy

R. Edlinger Short circuits in the tracks, points or wiring are almost inevitable when building or operating a model railway. Although transformers for model systems must be protected against short circuits by built-in bimetallic switches, the response time of such switches is so long that is not possible to immedi...   (View)

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LM4906 Boomer Audio Power Amp

Published:2011/8/14 20:07:00 Author:Amy

Source: National Semiconductor The well-known LM386 is an excellent choice for many designs requiring a small audio power amplifier (1-watt) in a single chip. However, the LM386 requires quite a few external parts including some elec­trolytic capacitors, which unfortunately add volume and cost to the circuit. ...   (View)

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IR Multi-Position Switch

Published:2011/8/12 2:12:00 Author:Amy

Peter Verhoosel This multi-position switch is operated by the IR transmitter with HT12R described elsewhere in the issue. The signal transmitted by the transmitter enters the circuit through infrared detec­tor IC4. At the output the demodulated signal is available, that via R2 and Tl is routed to t...   (View)

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PICXEX18 AND PlCWIN8- Operating System and Monitor for PIC Microcontrollers （2）

Published:2011/8/12 1:44:00 Author:Phyllis

By Lourens le Grange In Figure 1 the operating system’s ’task activation code’ is a single CALL TASK_X instruction. This will have to be extended. Firstly we need to add a test to prevent a task from being activated if it is switched OFF. Secondly we must be able to change a task’s entry point during runtime, in which case a CALL instruction cannot be used as the destinatio...   (View)

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PIC18Flash development Board: Continuing where the＇16 series left off （3）

Published:2011/8/12 1:40:00 Author:Li xiao na

By Peter Moreton Uploading the demo firmware using IC-Prog Download the Elektor PIC18Flash demonstration firmware, file number 040010-11.zip from the Free Downloads page and unpack the zip file to a suitable folder. Connect a short parallel cable between the PC printer port and the PIC18Fiash MTSP port K4, run IC-Prog and select File, Open File, PIC18flash.hex. Now click...   (View)

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On-line Conversions

Published:2011/8/12 1:39:00 Author:Amy

Luc Lemmens From time to time you may come across a unit of measure that’s completely unfa­miliar. It also happens that the name sounds vaguely familiar, but you just can’t remember the fine points. Although the Internet probably contains numerous sites that can help out, the most comprehensive one is probably www.onlineconversion.com. Here you can convert physics quantities ...   (View)

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Voltage Monitor

Published:2011/8/12 1:28:00 Author:Amy

Paul Goosens It is often necessary to monitor the power supply voltage in a piece of equipment. When the device takes its power from a battery, the input voltage can change and provide an indication of how much energy is left. Even a device powered from the mains can benefit from keeping an eye on the (various...   (View)

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