actually i find the circuit i want to build. but i can't find a proper spice model for it.

http://www.allaboutcircuits.com/vol_6/chpt_6/10.html

i want build that. can you tell me what pspice model i should use for it?

 

nevermind i found models. thanks anyway.

 

what kind of feedback can i use instead of op-amp with regular resistance?

 

what kind of feedback can i use instead of op-amp with regular resistance?

What does that sentece even mean? You probably could use some discrete differential amplifier made of only transistors and resistors, but that would be much more complicated than simply using some opamp.

 

What does that sentece even mean? You probably could use some discrete differential amplifier made of only transistors and resistors, but that would be much more complicated than simply using some opamp.

i want to a feedback system for circuit on the link. unfortunately i cannot use op-amp. just r, l, c, bjt and fet components.

 

Like this one for instance? http://www.allaboutcircuits.com/vol_3/chpt_9/3.html
There are tons of circuits like this all over the internet. Some better, some worse.

 

TO220.

Is it relevant for a Spice model?

 

TO220.

Is it relevant for a Spice model?

it is power amplifier package. i've decided to use tip41.

Like this one for instance? http://www.allaboutcircuits.com/vol_3/chpt_9/3.html
There are tons of circuits like this all over the internet. Some better, some worse.

it is pretty complex but i'll be good. thanks.