hi guys i have constructed and have been using this ucd amp based for quite some time . i wanted to juice it up to use multiple output like 4 pairs of irfp250 / ifrp260 or 3pairs of irf540 like in iraud 9amp with 250and 260 i wanted to do +/-72vlts at 4 to 2 ohms i dont have ociloscope or don't know how to go about one. much participation will be appreciated. stewin
hmmm, to go with high power, this circuit is too complicated. u can use simple one with ir2110 and can go such as power by using right mosfet. or drive it as fullbridge. btw this circuit is discrete, did u build it stewin?
yes i have built it it works. and has not been disturbing me with noise issues. i like discreet because when it fails or burns i only replace one or two 2n5404 near the outputs and the outputs them selves unlike using ir2110 . i have to replace the output everytime plus the expensive ir2110 ic every time something goes wrong.
agreed with IR2110 is expensive, discrete just need more work to do but you can save $$, i have few schema with discrete component and i do simu with LTspice seems work good. I think i will build it when i have time here i leave schema maybe anyone interested.
here is the result with LTspice, i do modification from original schematic because original one have 1.3% thd and offset is 98mvdc. so this is result for the modified one and i`ve free time today i`ll make one board for it, i wanna test it how this amp working and how stable it is.
wow thanks nozrami for the help . are you sure your circuit can drive irfp250 without heating . with my experience with discreet ucd R1 in your schematic needs to be of a high value or the output will heat like crazy. why haven't you include the op-amp preamp section is the gain sufficient enough? thanks for the simulation man GOD almighty bless you big time.