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Index 66
Up, Up and Away
Published:2011/7/27 3:38:00 Author:Amy
By David Daamen Telemetry applied to modelling sometimes produces astounding results — especially if electronics is part of the payload... Model construction and electronics seem to get on like a house on fire, new challenges appearing any time these two fields of interest are combined. The results are often rather special. For example, Olivier Humez on his website |1... (View)
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Project C+ Solved （2）
Published:2011/7/27 3:02:00 Author:Amy
By Prof. Martin Ohsmann Causality Causality states that in our physical world the flow of events is always the same: first, cause, then effect. You are aware of pain in your thumb after you hit it with a hammer and not before the unfortunate accident. If this principle is universal, is it possible in our simple circuit that a signal arrives at the output of a filter before it w... (View)
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Introduction of The 868MHz and 915MHz Drop-In RF Modules
Published:2011/7/27 2:53:00 Author:Phyllis
XEMICS’ 868MHz and 915MHz Drop-In RF modules have been designed to facilitate the development of wireless communication applications and to reduce the time to market as they can be soldered directly onto a host board to add RF capabilities. Using these DP1203 modules ranges of up to several kilometers may be achieved, through high output power and excellent sensitivity. The 868MHz module is ETSI pre-certified and t... (View)
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Project C+ Solved （1）
Published:2011/7/27 2:21:00 Author:Amy
By Prof. Martin Ohsmann The circuit described in the April 2004 edition of Elektor Electronics certainly gave rise to a lot of head scratching and raised eyebrows when it was shown to produce an output pulse ahead of the input pulse. Is it possible that such a simple circuit can turn the principle of causality on its head? Read on... The idea for this article began when a student as... (View)
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The SMD Chip LED Produced by Components Bureau
Published:2011/7/27 2:02:00 Author:Li xiao na
Components Bureau is the Cambridge shire-based passive component and specialist capacitor distribution company, which is able to provide the service from franchised component distributin to the PCB assembly. It has decades of history, so it can offer the customer the solutions which can be multi-faceted. A range of passive, opto and electro-mechanical solut... (View)
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Everything You Need to Know to Drive a Stepper Motor (4)
Published:2011/7/27 1:37:00 Author:Amy
By Horst Hubert Operation The driver circuit for the stepper motor consists of two identical halves, so we only need to look at one half. The signal at the input is converted by T9 into a square wave with an amplitude equal to that of the supply voltage to the circuit. This is necessary because the driving signal usually has a much smaller amplitude, such as 3.3 or 5 V. ... (View)
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Kitchen Table
Published:2011/7/26 22:03:00 Author:Phyllis
By Prof. Dr. Martin Ohsmann Low-Power LED Flash powered by lemon juice This circuit will need just a few micro-amps to make an LED flash. The energy comes from a home made ’vegetarian’ battery. We have to admit that the circuit shown in Figure 1 appears a bit over the top for an on/off indicator, as the same functionality could have been achieved from a clas... (View)
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Parallel Port Mains Switching Interface--switch radio controlled mains sockets on and off from a PC （2）
Published:2011/7/26 21:57:00 Author:Li xiao na
by K. Heiden Interface Circuit The parallel port interface circuit (Figure 3) is essentially divided into two parts: the part that drives the remote control transmitter using optocouplers, and two optional extra switching stages built around IC1 and two relays. This switching circuit allows for the control of two additional devices, located near to the PC, directly ... (View)
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Of Mice and Light
Published:2011/7/26 21:43:00 Author:Phyllis
increased accuracy without mechanics By Harry Baggen These days, no one is surprised any more about a mouse without a ball, although optical mice have been around for only a few years. Meanwhile, optical sensors have evolved to the point where they can easily compete with the accuracy of a mechanical assembly. In fact, they are often even more accurate and react quicker. ... (View)
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Parallel Port Mains Switching Interface--switch radio controlled mains sockets on and off from a PC （1）
Published:2011/7/26 21:41:00 Author:Li xiao na
by K. Heiden The wide availability of low-cost switched mains sockets with radio remote control provides a simple way to control electrical equipment, lights, etc. using a PC. Using radio not only means that we do not need a cable, but also avoids problems with electrical safety as the interface is electrically isolated from the mains supply. As USB interfaces becom... (View)
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2 Transistors, 1 Crystal — that＇s it!
Published:2011/7/26 21:19:00 Author:Phyllis
Poor Man’s DRM is here By Burkhard Kainka Almost too good to be true but tried & tested: a totally undemanding receiver giving you an opportunity to experience DRM digital broadcasts on shortwave. Digital SW almost for free! There are a large number of shortwave stations broadcasting not only conventional a... (View)
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Touch-controlled switch--With a PIC
Published:2011/7/26 21:19:00 Author:Li xiao na
Design by J. Wickenhauser You don’t need special ICs when a capacitive (or ’touch’) switch can also be realized with an inexpensive PIC controller. This article shows how it’s done. Over the past few years several manufacturers have come up with special integrated circuits for touch control switches. These ICs usually operate on the principle of capacitive change, w... (View)
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Through-hole plating double-sided PCBs
Published:2011/7/26 21:06:00 Author:Phyllis
Making a double-sided PCB is far from easy. It is quite a task to make sure that the artwork films with the tracks and pads are perfectly aligned on both sides. And it becomes even more difficult when both sides have to be connected at various points. The professional PCB manufacturer uses through-hole plating: the board is drilled and a thin layer of copper is deposited in the holes that require a connect... (View)
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Foil Capacitor Polarity--Which terminal of a foil capacitor acts as the screen?
Published:2011/7/26 21:02:00 Author:Li xiao na
By H. Friedli As most of you will be able to confirm, an electrolytic capacitor has to be connected the right way around in an electronic circuit. If you get the connections wrong, the innards of the capacitor will greet you when the power is switched on — the capacitor can will rupture, spilling its liquid or partly vaporised contents across the circuit board or (in the case of older high-... (View)
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Repairing the damage caused by leaking batteries
Published:2011/7/26 20:59:00 Author:Phyllis
Most of you will have suffered from this at one time or another: a torch or other battery-powered equipment has been neglected too long and the batteries started leaking. After all, these cells contain a cocktail of corrosive chemicals that will eventually find their way through the battery housing and end up in all those places where they’re not wanted. NiCad cells that are overcharged can vent the electrolyte in ... (View)
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Simple l2V to 230V Power Inverter--A mobile power outlet（4）
Published:2011/7/26 20:43:00 Author:Li xiao na
Design by G. Gerards Construction The design of the printed circuit board is shown in Figure 4. Despite large ground areas and wide tracks it may be necessary to strengthen the tracks carrying the transformer current by tinning them. It is recommended to start by mounting the AMP (’fast-on’) lugs (spade terminals), because they require considerable force to insert i... (View)
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Everything You Need to Know to Drive a Stepper Motor （3）
Published:2011/7/26 4:13:00 Author:Amy
By Horst Huber Hardware Now that we have determined what the properties of the motor are, we have to choose the right hardware. But don’t panic, we’ll work through this in a few simple steps as well. Our driver stage has several limitations. The maximum operating voltage is 18 V (preferably a bit less, such as 15 V) and the maximum motor current is 2 Am... (View)
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Everything You Need to Know to Drive a Stepper Motor （2）
Published:2011/7/26 3:48:00 Author:Amy
By Horst Huber 2. Connections Once you have determined what type of motor you have, it’s time to find out which leads belong to each of the windings. Measure the resistance between the connections using a multi-meter. Go through all possible combinations and make a note of the results. The resistance between the ends of a winding will be low. Between the centre t... (View)
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Everything You Need to Know to Drive a Stepper Motor (1)
Published:2011/7/26 3:31:00 Author:Amy
By Horst Hubert First steps Stepper motors have found their way into Elekfor Electronics many times, most recently in the November and December 2003 issues. In contrast to previous articles, well keep it practical and won’t go into the theory. If you want to know more about the background, have a look at some previous articles (listed in the reference section at the end of this arti... (View)
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Wind Speed & Direction Meter with a Clever Touch （4）
Published:2011/7/26 2:56:00 Author:Amy
G.Samblancat Amplifier adjustments The first thing you need to do after switching on the supply voltage is adjust the four multitum presets P1-P4. Your goal will be to make the ICla and IClb output signals cover the full range of 0.5 V to 4.5 V. This may be done with the aid of either an oscilloscope or the TUNE software. In the first case you closely watch the... (View)
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