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thanx shaiqbashir but i have found tl494 in orcad in controller.olb.but i m unable to simulate it properly.i dont know wat i m doing wrong and i really need help.i disabled one error amplifier and am usin only one.but the out transistors donnot turn on at any stage giving me a constant Vcc output.

but can't i get their models from somewhere?

hi everyone i usually simulate my circuits in orcad capture.but there are times when i have to use ICs in them too e.gTL 494 in a switch powersupply.i cant find most ICs in the libraries given.can someone help me out here.if they are there then in which libraries should i look for them? also sometimes u also want to put somthing programmable in ur circuit like a microcontroller.is it possible to simulate such circuits in pspce? thanx

can i get a designed amplifier somewhere with all the calaculations regarding capacitors and resistors done?

hi i want to design an audio amplifier.i plan to use two CE stages for amplification and a class AB-output stage with darlinton connection.first of all which bjt's or fet ic's should i use.also is there some ic which has class ab output stage and a darlinton connection in one.