thanhyuse Posted March 12, 2004 Report Share Posted March 12, 2004 Hello Administrator! Can you help me?ok!So ,can you tell me something about "25w mosfet audio ampfilier",well ... what does this circuit work?...Project Link: http://electronics-lab.com/projects/audio/001/index.html thanks a lot!I wait you. Quote Link to comment Share on other sites More sharing options...
mozikluv Posted March 13, 2004 Report Share Posted March 13, 2004 hi thanhyuse,i don't know how far you are into electronics, but base on your question i could probably presume you are a real beginner. if that is the case my friendly advice is to look for circuits not using mosfets as the output stage and using single rail supply.but if you insist in building that circuit, pay attention to the following;R13 & 16 10ohms should be match (same value when tested)R14 & 15 220ohms should also be matchQ1 & 2 should also be matchyou should a single ground point entryQ6, 7, 8 & 9 should be properly heatsinkedi have build that circuit and it was good, just follow the recommended parts. use high quality electrolytic caps.hope this would help you :) Quote Link to comment Share on other sites More sharing options...
jai Posted April 18, 2004 Report Share Posted April 18, 2004 hey, i am having a problem with my power amplifier, it's a 50w PA with audio mixer. I am quite desperate now, i have tried to lessen the humming, indeed it is quite less, but my proff wants no humming at all....what shall i do? please help me out?thank you very much. Quote Link to comment Share on other sites More sharing options...
MP Posted April 18, 2004 Report Share Posted April 18, 2004 There are many reasons you might have noise. Do you have the schematic? Sometimes a picture of the circuit is also useful.MP Quote Link to comment Share on other sites More sharing options...
thanhyuse Posted May 1, 2004 Author Report Share Posted May 1, 2004 hi!thank you very much!and you right,i'm a newcomer,so i have many problem,but i will try.I did this circuit,but not success!something wrong? when I conect to supply,voltage here drop very fast!!!! :'( Vbe of Q6<0.6V. current at Q8,9 very fast.So again you will help me? thanks all Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted May 1, 2004 Report Share Posted May 1, 2004 hey, i am having a problem with my power amplifier, it's a 50w PA with audio mixer. I am quite desperate now, i have tried to lessen the humming, indeed it is quite less, but my proff wants no humming at all....what shall i do? please help me out?thank you very much. Look for any wires that go in to the amplifier. If one shield wire is broken there will be a hum. Also a bad mic will cause a hum. If that does not work then you should look at the capacitors in the power supply section of the amplifier. Also You could spray the controls with some contact cleaner. ( only Use contact cleaner designed for this! If you don't it will ruin the controls for good!) Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.