faizanbrohi Posted July 10, 2006 Report Share Posted July 10, 2006 Please post all yor comments regarding a sine wave inverter here.a Class D amplifier schematic would be fruitfull Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 10, 2006 Author Report Share Posted July 10, 2006 Since Class D Ampilifiers are cold amps or have 100% theoratical efficiency with upto 94% practical efficiency . it is very much suitable for a sine wave inverter design , however i was able to look up a site which is open source class D Amplfier Sitehttp://hem.passagen.se/johanps/index.htmPlease take a look Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 10, 2006 Report Share Posted July 10, 2006 To make 230VAC with a sinewave, the output of the amplifier must be 650Vp-p.So it is practical to make a class-D amplifier with a low output voltage but a high output current then stepup the voltage with a transformer. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 10, 2006 Author Report Share Posted July 10, 2006 please take a look at the link i posted above , i think it is a simple and effective design. but i can't find how much power it is delivering Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 10, 2006 Report Share Posted July 10, 2006 please take a look at the link i posted above , i think it is a simple and effective design. but i can't find how much power it is deliveringThe archive notes say 102W into 8 ohms or 180W into 4 ohms. It quickly got very warm with 180W output and so the mosfets need better heatsinking.Efficiency was about 86%.Note that its power supply is positive and negative 50VDC. About eight 12V car batteries in series would power it. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 11, 2006 Author Report Share Posted July 11, 2006 hmm i think probably it would be nice to use a bigger 12V battery and use a DC-DC Converter Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 11, 2006 Report Share Posted July 11, 2006 hmm i think probably it would be nice to use a bigger 12V battery and use a DC-DC ConverterThen you are making a class-D car amplifier that doesn't have as much power as the ones you can buy. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 11, 2006 Author Report Share Posted July 11, 2006 Cannot we shape the wave of a square wave output to sine wave Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 11, 2006 Author Report Share Posted July 11, 2006 I mean to say the output from the transformer that is square wave. and it is shaped to sine wave Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 11, 2006 Report Share Posted July 11, 2006 Cannot we shape the wave of a square wave output to sine wave?Sure, you can use a couple of RC lowpass filters or an LC tuned circuit. Then the load must be a high impedance so no power can be drawn. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 Can you suggest a circuit for the waveshaper , that you were saying using the RC filters Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 and how powerful they should be to withstand 220V ac at the output and a power of 500W Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 15, 2006 Report Share Posted July 15, 2006 Can you suggest a circuit for the waveshaper , that you were saying using the RC filtersI said that if a wave-shaper is used at the output then the load must be a high impedance which takes no power output. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 So can we make multiple cascaded Class D amplfier IC you suggested and make it upto 1000W or the Class D amplfier i gave , can we ??? Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 15, 2006 Report Share Posted July 15, 2006 So can we make multiple cascaded Class D amplfier IC you suggested and make it Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 So making a transistorized Class D amplifier can be a good choice , the one i showed you Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 Cascaded can be done in a transistorized circuit Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 Audio Guru Please i need your help in the Stereo power amp 2x40W = 80W the topic i have started . i have done the PCB and its layout , a schematic from the PCB layout can be really appreciated , please , thanks ::) Quote Link to comment Share on other sites More sharing options...
audioguru Posted July 15, 2006 Report Share Posted July 15, 2006 This thread talks about sine-wave inverters, not the amplifier in your other thread. Quote Link to comment Share on other sites More sharing options...
faizanbrohi Posted July 15, 2006 Author Report Share Posted July 15, 2006 So kindly loook in the Thread regarding Stereo Power amp 2x 40W = 80W , please and help on the schematic Quote Link to comment Share on other sites More sharing options...
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