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There are currently no product reviews.
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I needed the manual immediately and I got it immediately. I couldn't find this manual anywhere else on the net. The site was easy to traverse, and the price was very reasonable. I'll definitely be back for any future needs.
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I received a good service manual, with good resolution. Improve the instructions for the purchase because they are not well understood.
For the rest, so good.
Thanks Angel.
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Very good documentation for the Grundig 2077 model (as well as similar 800/900/1000 series radios). The first two pages are a summary of reception specifications and output capability. The third page is the tuner dial indicator and dial cord routing diagram. the final ~5 pages are the schematics for the various models (including 2077). The scan quality of the schematics are good, adn can be easily read if zoomed in. The documents are in German, not English as stated. It would have been nice to have the tuning sequence and settings, and some trouble shooting materials... or component and wiring map.
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Perfect like it was descriped, Perfect like it was descriped
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Very good detail, all pages clear, exactly what I needed
8-1
8-1
6-channel class-D amplifier
Basic operation of a class-D amplifier Basically, the output stage of a class-D amplifier outputs a continuous square wave swinging between positive and negative power supplies with a fixed frequency (�clock� frequency) far beyond the audible range. The duty cycle of this square wave is modulated with the audio signal. The output is followed by a low-pass filter which eliminates the clock frequency and allows only the audio signal going to the speaker. See simplified drawing below.
AMPLIFIER BOARD
TABLE OF CONTENTS Class-D Amplifier circuit description ................................................. 8-1 Exploded view + mechanical parts ................................................... 8-2 Amplifier circuit .................................................................................. 8-3 Clock Generator & connector - circuit ............................................... 8-4 Bottom view ....................................................................................... 8-5 Top view ............................................................................................. 8-6 Bottom view Part A ............................................................................ 8-7 Bottom view Part B ............................................................................ 8-8 Top view Part C ................................................................................. 8-9 Top view Part D ............................................................................... 8-10 Electrical parts list - Amplifier board ............................................... 8-11 The main disadvantage of this concept is: � The amplifier is operating with a high-frequency square wave at high amplitude and currents. This requires special precautions to prevent excessive electromagnetic radiation (EMC). Compared to a conventional power amplifier the benefits of the Class-D amplifier are: � higher effiency � lower power dissipation � smaller heatsink required � smaller mains transformer required
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