rose Posted May 16, 2017 Share Posted May 16, 2017 Hello,all I want to ask you some advice or help for my amplifier. I am interested in building a amplifier which is based on two darlington power transistor--TIP142 and TIP147. (This is the datasheet of TIP142 and TIP147: http://www.kynix.com/uploadfiles/pdf65976/TIP147.pdf ) Because It’s the cheapest 150 Watt amplifier circuit I can make. However,I am finding difficulty accepting the differential input should be driven between -45V and +45V. Meanwhile,I think that using PNP transistors for a differential input is quite uncommon today. 1) To meet my criteria I changed parts of the circuit so that the differential input is made of NPN transistors instead that are connected between 0V (common, ground) and the +45V. 2) The output stage has also been modified so that R3 and R5 are on the negative side of the supply (-45V). I moved the driver transistor Q3 to the other side, that is, the +45V making sure to keep the same resistor values. Naturally, Q3 has been replaced by a PNP transistor. 3) In the input stage, differential input, the signal ground has been made the same as that of the differential input stage. I am attempting to build the amplifier with my modifications.Do you have any suggestions to give me? Best wishes~ Quote Link to comment Share on other sites More sharing options...
djk Posted May 16, 2017 Share Posted May 16, 2017 Put up a link to your schematic. Quote Link to comment Share on other sites More sharing options...
NOSValves Posted May 17, 2017 Share Posted May 17, 2017 You might want to move this thread to the Solid State or technical forum. Since they implemented all the various sub forums for SS and tubes the once mighty 2 channel area is a ghost town.... as DJK states a schematic is going to make it much easier for him help you. Quote Link to comment Share on other sites More sharing options...
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