Burning Amp BA-3

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#605
generg said:
fine work Kamel and Botte......!🙂🙂🙂

Zen Mod must be in the wrong thread.....doing gymnastics or he is coming from a party....or he tries to do Bavarian dancing.... please tell us ZM...😀😀😀
Click to expand...

Bavarian Dancing , off course

just imagine me in Lederhosen :rofl:

ok - simple explanation without elastic thingies :

ya see Q3, Q4 and R13

presume that PSU voltage is +/-22V5

let say that we are going to replace both Q3 and Q4 (along withtheir source resistors) with (variable ) resistors with value of U/I=22V5/0,045=500R

DC is flowing from Q3 to and through Q4 ;

now imagine that we are giving some sine on input , which result in opening ( down-going half cycle) Q3 and resulting in halving that virtual resistance of 500R , so we have 250R

DC can't go entirely to Q4 and must go through R13

but - in same time , same down-going half cycle is governing Q4 too , resulting in increasing it's virtual resistance to 750R

result is that current flowing from Q3 have even lesser possibility to flow through Q4 and that difference must go again through R13


now - turn schm for 180degs and repeat mental gymnastic

simple , isn't it - same as two hands and rubber string

:clown:
 
#607
wow.... first time I saw electronic gymnastics.....this way of understanding is not learned up to now....

you are all witness of a new area of electronic teaching........

can I be your representative for Germany ZM ?......😀😀😀
 
#608
I think I got it:

Gain won't added in first Stage because they don't share the "Load Resistor" which is ( R6 respectively R7) but in second Stage they share Load Resistor...
So Gain is: A1*(A2+A2) = 0.7*(13+13) = 18.2 (or idealized 1*(15+15) = 30) 🙂🙂
 
#611
I’ll yield to you ZM (though we still haven’t answered the question of why the gain is not what Nelson described.) I love my BA-3 with a gain of 8.5 it sounds great!


P.S. I haven’t seen anyone post that they have a gain of 30dB. I’m just sayin.. 😀
 
#612
Pa is a man with multiple virtues

one of them is that he doesn't care too much for numbers , sometimes .

:rofl:

frankly - I didn't build that stage , I didn't calc it's gain ..... and I don't believe too much in numbers , too :devily:
(but not from same reasons as Pa ; he knows da numbers , I'm dumb for that )

Generg - what's gain of your BA3 FE , built by the book ?
 
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#616
you're welcome here

at least you have proper avatar , contrary to all wakoos loving sissy sand amps
 

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