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of an amplifier. I assume it would be Rin=R1||R2. But result is very different from measurements. Rin measured is 284 ohm.
Also, Rout measured is 4.33ohm with 8.2ohm load so the formula in first reply is missing something or i am reading it wrong because the result is about 500ohm which is far...
I am trying to calculate output and input resistance of this AB class amp:
I calculated R input in this way: Rin=(hie1+hfe*R3)||(R2)||R1/(Av+1)
hie1=324,67ohm, hfe=130
I have measured it and the result is very similar, but my mentor says there is another way (more propriet) for calculating...
Why are you apologizing, you are doing me favor with your replies! :)
Thank you very much for your answer and suggestions. I`m really trying with all those tutorials but its not just piece of cake, this answers really help me.
What means push the RC? To put a signal through RC, then it works...
Thank you for reply. It looks very nice in LT Spice, but you did advanced thing for me yet :)
my problem is to calculate currents and voltages in dynamic analysis. As you can see on my pictures, currents and voltages aren`t the normal voltage/impedance case, because of Vcc and Vee of Diff...
With a great help from sir godfreyl i did my DC calculations. Now, i started doing AC and already have a problem :)
So, this is scheme of P3A amplifier which i am calculating ----> **broken link removed**
I have a problem in input filter of amplifier. My simulating program is Isis Proteus so...
Yeah i see it now... I made the whole project simulation and it really is, resistance change doesn`t make any difference. And -57mV to +124mV is ok? As you said in your first post, it can be better but its not too bad either..
I assume i should already know this by now, but i will have a...
Thank you very much.. I read it and i think you got all my problems solved :D i`ll calculate it tommorow, today i am out of time. i`ll write here what i got!
thanks once more Sir
Why sorry? :D you made me a big favor just with first post. This is a lifetime due for me :)
Yeah i understood how to get that current from your first reply. And i know that base current of Q9 is so small that its irrelevant, but the base current what i need to know is Q5 base current. Because...
I am using Proteus ISIS simulation program (schematics i posted are from proteus), and i calculated (Icq/Ibq) that hFE is about 365 so i`m calculating with that number. Ib1=3.05uA, Ib2=3.9uA. They are in boundaries <10uA :)
Your calculation is perfect :) but i found a problem here. 5mA is Vbe...
First, i wanna say hello :) this is my first post, i have this problems in my head for few weeks now so i decided to ask this here.
I will construct Rod Elliotts P3A -> **broken link removed**
i am doing this for my college, so i need to do some calculations. First thing is to do a DC...
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