Does anyone have a simple schematic using just CE, CC which can output 15W @ 4 Ω load with efficiency >40% and the input resistance higher than 20k using ± 12V.
Thank you very much.
Thank you very much.
What do you expect it to be? Will a traditional 3-stage amplifier be too complicated for you?
That's 11 V peak. A simple, typical power amp circuit will require significantly more than just 1 V of headroom. I haven't looked into this but I assume some of the Rail-To-Rail techniques used in opamps could be used in a power amp too.
Don’t overthink. I believe he/she is working on the school assignment. A traditional 3-stage amplifier with single pair push pull emitter follower will do.
Not complicated to me, but i have to do group assignment by myself because my teammate can't do any thing 😭 they just learn this course for credits thus i need to explain this to them. If it is too complicated then they cant understand.
A diff amp ( Long tailed pair ) one VAS transistor feeding a pair of output NPN's / PNP's will do for 15W. duno about +-12v tho.
You can add constant current to it and a current mirror to make it nicer , and maybe a darlington output pair.
Can't the supply voltage be higher?.
You can add constant current to it and a current mirror to make it nicer , and maybe a darlington output pair.
Can't the supply voltage be higher?.
I just made a 35 dual rail smps from sg3525 but the problem is that the voltage ripple about 400mV peak-peak which will cause noise to the amplifier. Thus i want 12 dual rail because i have bulk transformer that can output clean voltage.
@Els_Chaos Simple design. Can get even " simpler " if you remove the constant current and current mirror , maybe darlington output pair.
Attachments
Welll, actually im filter it with 10000uF cap 🥹 maybe should i add LC low pass filter
Maybe this is the simplest version i can get.
Stimulated and worked fine but i'm not sure it's stable in reality
Looks good. 100uf on input is to much, also you can add a low pass filter for EMI , AM reception .
Why a pot in the feedback loop?
If you have trouble with thermal runaway , tho you shouldn't. Q9 glued to Q10 or on the heatsink.
C5 might need to be bigger ( 47 - 100p ).
Small 47 ohm resistors in the ltp emitter resistors might help.
Should work fine in real world as it is tho.
Why a pot in the feedback loop?
If you have trouble with thermal runaway , tho you shouldn't. Q9 glued to Q10 or on the heatsink.
C5 might need to be bigger ( 47 - 100p ).
Small 47 ohm resistors in the ltp emitter resistors might help.
Should work fine in real world as it is tho.