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10th January 2007, 05:45 PM
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 1w Class D Amplifier i am searching circuit design of 1w class d amplifier, i have no enough knowledge about electronics or circuit designing, please help. also i have searched whole network about class-d via google, but i could not find any sufficient documents. i know 1w is a simple value if we think more powerful amplifiers, but this is my homework, i have basic block diagram as you saw. but i could not know how to design and define the values of electronic materials. | |
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10th January 2007, 06:05 PM
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 1W into an 8 ohm speaker is a signal of 2.83V RMS which is only 6.5V peak-to-peak. The comparator has a triangle-wave input and the signal input and is a high frequency Pulse-Width-Modulation circuit. The LC network feeding the speaker is a lowpass filter. I remember seeing your block diagram in Google. I think its article explained how it works. Now learn about comparators, Mosfets, PWM circuits and lowpass filters then make a class-D amplifier.
__________________ Uncle $crooge | |
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18th January 2007, 07:53 PM
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| i have researched whole the net to find a schema but i couldnt find. Afterthat, i have designed a circuit (attached). But i have some errors i think, because it didnt work properly. please help. i have to find a 1w d class circuit. very important. | |
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18th January 2007, 09:00 PM
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| Nice try. But the old LM324 opamp is way too slow. I recommend using a TLC071 modern opamp that is 100 times faster. The transistor isn't needed then the supply voltage is too high for the gates of the Mosfet. A total supply voltage of only 12V is plenty. I re-calculated the LC filter for a cutoff frequency above the audio band. I used an 8 ohm speaker because an 8k ohm speaker wouldn't make much sound. It should have an output power of about 1.8W.
__________________ Uncle $crooge | |
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18th January 2007, 09:45 PM
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| thanks guru, i want to simulate this circuit not only theorically but also practically, so i looked for irf9140 p channel mosfet, or irf 150 n channel mosfet, but i couldnt find them. which fets could be used for them? same problem with opamp. what are your advices? | |
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18th January 2007, 09:46 PM
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| First advice is to fill your location in! - pretty pointless Audioguru suggesting places in Canada to you! (probably?). | |
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18th January 2007, 10:39 PM
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| There are hundreds of Mosfets that will work in that amplifier circuit. There are also quite a few wideband opamps but that is the one I use and I don't know anything about what you can or cannot get in Istanbul.
__________________ Uncle $crooge | |
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19th January 2007, 07:46 AM
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| Well there's a LOT of electronics manufacturing going on in Turkey, all the cheap junk TV's in Europe are made there, apparently the EU give Turkey huge grants?. | |
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