Electronics > Beginners
Need help to calculate data for this amp.
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FriedMule:
Thanks for your reply:-)

When I chose the scematic, I started out by serching for scematics from the amplifiers I did remember as the best to my ears, and luckely I found one.
I have no idear how or why this shuld work, all I remember is that it was wery musical, but lacked a bit control.
Other talks about that it is clipping more then meny others, it did also lack a bit in control. I think, I can always add feadback if I want to, and if I upgrade the transformer, I shuld give better control and less change for clipping :-)

Audioguru:

--- Quote from: FriedMule on June 16, 2018, 03:08:52 pm ---I did remember as the best to my ears, and luckely I found one.
I have no idear how or why this shuld work, all I remember is that it was wery musical, but lacked a bit control.
--- End quote ---
Without any negative feedback then its high frequency response is poor and it cuts distortion. Maybe you like the muffled sound.
Please explain what is "control".


--- Quote ---I can always add feedback if I want to
--- End quote ---
Negative feedback reduces the gain then you will barely hear its output. The amplifier must be designed with lots of gain to use negative feedback.


--- Quote ---If I upgrade the transformer, I shuld give better control and less change for clipping
--- End quote ---
Clipping occurs when the input level is too high and causes the output of the amplifier to try to go higher than it can go. The design of the amplifier must be improved, and the supply voltage and the supply current must be increased. If you upgrade the transformer only then this little 60W amplifier will blow up. A 600W amplifier will be a little louder with no clipping.
Zero999:

--- Quote from: FriedMule on June 15, 2018, 08:06:10 am ---All I want to do, is to build this amplifier, loved the sound except a fej minor things.
I know it is a non feedback type but still I miss some control of the base and some say it can clip if your line in i.e. CD is turned all the way up.

The amplifier is a AB type:-)

--- End quote ---
The circuit does have negative feedback. It's just taken before the unity gain output stage, which isn't ideal, but it doesn't mean there isn't any negative feedback at all.
glarsson:
What is the function of the two 24V zener diodes (1N4841) doing in the output stage?
Why are they drawn as normal diodes? Should they be 1N4148?
Audioguru:
I do see some negative feedback from the 100k R(blank) to the 2k R(blank). Why isn't the output stage included??
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