Amp Will Not Function

[prorms]

33000/100 + 1 =331=33.1=vac
33.1*sqrt*2=11.05 peak
your saying 33k for r9 ,r2 and r8

[AndrewT]

This is like sack cloth and ashes.

Why do I do this to myself?

Pr,
why have you reverted to the wrong connection for R8?

Why have you left D3 & D4 still inserted?

Why have you got so much gain, when most of your peers can manage with 20 to 60 times?

Why is C6 there?

Learn how to do multiplication manually because you cannot use a calculator.

33k for r9 ,r2 and r8

why, when you can adjust EITHER r6 or r9 or both?

[prorms]

Why have you got so much gain, when most of your peers can manage with 20 to 60 times?
do not understand this part???

[AndrewT]

Why is no-one else helping out here? Oh, I know!

The amplifier gain is set by the global negative feedback.
NFB components are r9, r6, c3.

AC signal gain = r9/r6 +1 for a non-inverting amplifier (when the signal sees c3 as a near short circuit).

When DC is being amplified gain = r9/ [c3impedance + r6] + 1= ~0+1=1 i.e. gain at DC is 1. this is inherent in the DC blocking action of c3.

Back to AC gain.
When the impedance of c3=r6 then the gain has dropped to about half it's high frequency value. This is the bass rolling off. If you want some bass you need to select r6 and c3 appropriately.

Go and do more reading/learning.

[turnA_zpoint]

Hi
I studied the means of Q7,Q8 ,thank you.
That is over current limiter　for sake of speaker protection
I was lacking in my study.
It is the technique that it does not use very much
with our amateur friend.
Thank you.

I intend to mention others after studying more.

Sincerely

[prorms]

what value would be a good one??
for q7 and q8

[prorms]

made alot of changes dont build yet
warning!!!!!!!!!!!!!