My 50W class A design!

[jam]

As an amplification device either one could be more noisy if you you take the source impedence into account.

 

[thanh]

io=2mA,how can i calculate the value of R1?
thanks a lot!

 

[jam]

Divide 0.6 by 2ma. to get your answer. (300 ohms)

Vbe is the baes emitter drop which is 0.6 volts. You have to transpose I and R in the equation.

Regards,
Jam

 

[thanh]

Oh!Sam!thanks you!BUt i want to know the value of R1 not R2

 

[jam]

Thats Jam.....😀 .

To calculate R1 you want about 3 to 4 mls running through the reference. First you need to find out how may volts there are across R1. Lets say it is 40 volts then if you need 4ma the resistor required is 40/4ml =10k ohms.

Regards,
Jam

 

[thanh]

Vi=35V,so R1?

 

[jam]

R1 = 35/4ma = 8.75k ohms.

Regards,
Jam

 

[thanh]

Hi Panzerlord!How are you?how are your amp?You haven't visitted this forum for a long time.
Can you reduce more distortion ?If your power transistors are biased in class B,how is the value of distortion?
You seem to not like symmetrical topo.

 

[demogorgon]

it seems panzerlord har vannished..

he's dissapeared from www.overklokking.no too, a shame really.. i was looking forward to see the ressoults of this amp.

 

[cunningham]

Just a thought for Panzerlord...What about using a small audio transformer to couple (& stabaly bias) the input? This may make it easier to achive a balanced input.

 

[Konrad]

Last discusion i had with him abt the subjekt as i know is here: And im sorry it's in norwegian
http://www.hifisentralen.no/cgi/yab...n=display;num=1078497178;start=0;showall=true

ugh ugh!