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Index 50
HIGH-END POWER AMP-High-class watts （1）
Published:2011/8/21 20:38:00 Author:Phyllis
By Ton Giesbets The High-End Preamp preamplifier published in the April & May 2004 issues naturally calls for a matching final amplifier in an identical housing. Due to the restricted size of the enclosure, the output power of this final amplifier is somewhat on the modest side, but the quality is outstanding... (View)
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＇Edwin＇ Audio Amplifier （1975）
Published:2011/8/21 20:17:00 Author:Phyllis
By Jan Buiting Blending in beautifully with this month’s focus on all things Audio I’d like to take you back to September 1975 when Eleklor magazine published an audio amplifier named ’Edwin’. 1975 was the first full year the English-language version of Elektor was published. Not surprisingly, the then editors looked at designs that had already proved extremely popular in the German and Dut... (View)
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Frequency Spectrum from DC to 30 GHz in 4 pages 3
Published:2011/8/19 4:36:00 Author:Amy
Paul Goossens 27 MHz The 27 MHz band, also known as CB {Citizens Band) or 11 meters, lies between 27.60 MHz and 27.99 MHz in the UK, and between 26.96 MHz and 27.41 MHz in the EU. In the UK a license is required (o use CB, although in many other European countries this is no longer the case. Lorry drivers and cabbies are one group of people who are well known for their use of CB to ... (View)
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Frequency Spectrum from DC to 30 GHz in 4 pages 2
Published:2011/8/19 4:32:00 Author:Amy
Paul Goossens Professional communications Apart from radio and television broadcasting, there are many more applications where radio is used for the exchange of information. Just think of the communications in aviation, shipping, the police, etc. These particular groups also hove various parts of the sp... (View)
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Frequency Spectrum from DC to 30 GHz in 4 pages 1
Published:2011/8/19 4:29:00 Author:Amy
Paul Goossens Life without wireless communications is almost unthinkable in the modern world. These days virtually everybody makes use of some type of transmitter or receiver: GSMs, broadcast radio and TV, WLAN, Bluetooth, and so on. And there is still a lot more happening in the radio spectrum. In this article we show what else can be found in ’the ether’. Over the years, organizat... (View)
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Wireless Microphone: Audio in the ISM band 4
Published:2011/8/19 2:15:00 Author:Amy
Ton Giesberts Interface Thanks to these complex modules that include almost all the necessary electronics, what remains is straightforward. Figure 4 shows the two parts of the circuit. In the transmitter we can either connect a microphone or any other desired audio source with a maximum output level of -15 dBV. In most cases, however, an electrets microphone will... (View)
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Wireless Microphone: Audio in the ISM band 3
Published:2011/8/19 2:07:00 Author:Amy
Ton Giesberts The receiver The block diagram of the WA-RX-01 receiver module shown in Figure 3 is practically the mirror image of the transmitter, using similar components. RF band-pass filter (SAW... (View)
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Wireless Microphone: Audio in the ISM band 2
Published:2011/8/19 2:01:00 Author:Amy
Ton Giesberts The transmitter Figure 2 shows the functional blocks of the WA-TX-01 transmitter. We will look at each in turn. Input buffer (BUF) This circuit is an input buf... (View)
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Wireless Microphone: Audio in the ISM band 1
Published:2011/8/19 1:55:00 Author:Amy
Ton Giesberts The WA-TX-01 (transmitter) and WA-RX-01 (receiver) modules represent a novel concept in the wireless transmission of audio signals. Thanks to low power consumption, the technology leads itself to a wide range of audio applications. The transmitter and the receiver include components such as SAW fi... (View)
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OPINIONS ON VALVES （3）
Published:2011/8/19 1:52:00 Author:Phyllis
The valve sound: myth or reality? By Klaus Rohwer, PhD That famous valve sound, does it really exist? Yes, it does — but it doesn’t have to come from a valve! Here we have to make a distinction between devices for producing music and devices for reproducing music. The first category includes music amplifiers(View)
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OPINIONS ON VALVES （2）
Published:2011/8/19 1:42:00 Author:Phyllis
By Bernhard Vollmer The valve microphone: physics versus emotions The author has been actively involved in quality assurance at Schoeps, a German manufacturer of studio microphones, for nearly two decades. As a supplier to Schoeps, his company Elvo makes the model M222 valve microphone (www.m222.de). What would music be without emotion? Should our experience, ears and sensit... (View)
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OPINIONS ON VALVES （1）
Published:2011/8/19 1:29:00 Author:Phyllis
Valves versus transistors We have two audio amplifier design articles in this issue: one with valves and the other with transistors. They are just as different as people’s opinions on the issue of valves versus transistors. Does it make sense to go back to the amplifier technology of our grandparents? Is... (View)
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AUDIO-TWEAKS from demagnetizing to varnishing （2）
Published:2011/8/19 1:15:00 Author:Phyllis
By Harry Baggen The activities the American company CyroPlus are less strange, and they also have a technical explanation. What they do is to chill interconnecting cables and speaker cables, as well as individual valves and ICs or even entire circuit boards, down to absolute zero. The idea behind this is that it restores the original crystalline structure of the materials i... (View)
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AUDIO-TWEAKS from demagnetizing to varnishing （1）
Published:2011/8/19 1:06:00 Author:Phyllis
By Harry Baggen For true audio enthusiasts, nothing’s too far out when it comes to improving the sound quality of their hi-fi or surround-sound systems. Naturally, you can spend a lot of money on cables and other accessories, but there are a lot of possibilities that go even further, such as equipment modification... (View)
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Bidirectional S/PDIF Converter
Published:2011/8/19 0:49:00 Author:Phyllis
By Joseph Kranz Although S/PDIF is the standard when it comes to conveying digital audio signals in consumer electronics equipment, difficulties may be encountered if you try to connect up two apparatus having digital connections. Cheap equipment usually has only one connection (coaxial or optical), while more up-market products will generally offer both variants. When interconnecting CD an... (View)
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OPAMP TESTER
Published:2011/8/18 22:39:00 Author:Phyllis
Quick go/no-go testing for operational amplifiers By Dirk Scheumacher Not a microcontroller in sight, and yet this item of test equipment will be found very handy in any elect... (View)
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Playful Lights: Just there LEDs...
Published:2011/8/18 21:46:00 Author:Li xiao na
By hubert Marwald Here’s a recipe to make LEDs produce slow, continuous light effects rather than abrupt changes normally obtained from square-wave drive signals. If you are after really accurate control of one or more LEDs, the best option by far is pulsewidth modulation (PWM) which is usually obtained from a dedicated PWM chip or a suitably programmed microcon... (View)
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The Constant Current provided by Semitec
Published:2011/8/18 3:07:00 Author:Li xiao na
The Semitec is the leading supplier of thermal components all over the world. The thermal components can work with some of the main suppliers in the thermistor and thermostat industry. This manufacturer has the history of more... (View)
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Wireless Connectivity: ISM, WLAN, WMAN, Bluetooth et al. 7
Published:2011/8/18 2:49:00 Author:Amy
Stefan Tauschek Spatial multiplexing Antenna diversity is aimed exclusively at improving results at the receiver end, and it can be used even if the transmitter end has only one antenna. However, if multiple antennas are used al both ends of the path, even more refined technical tricks can be used to i... (View)
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Wireless Connectivity: ISM, WLAN, WMAN, Bluetooth et al. 6
Published:2011/8/18 2:42:00 Author:Amy
Stefan Tauschek MIMO Increasing antenna gain by a few decibels is by no means the only trick that can be conjured out of the magic box of RF technology Multiple-input, multiple-output (MIMO) technology is also proposed as a means lo significantly increase range and data rates without increasing RF power. What lies behind this name is a sophisticated antenna technology called ’p... (View)
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