Design Guidelines for Bipolar Transistor Audio Preamplifier Circuits

[Mr.Huge]

This is a cool article... Enjoy!
-Mr. Huge
http://www.rason.org/Projects/bipolamp/bipolamp.htm

[Eirik]

Thanks! That's  really usefull reading!

[troubledtom]

cool,
     - tom

[nelson]

Thanks Mr Huge.


You always pop up with useful information.

[Dragonfly]

thats a good page...

you'll find "that" link, and several more from the same guy/site on fets and opamps in my "useful links" post from a few weeks ago !

enjoy !

[petemoore]

  That link did it for me this time.
  I've seen this before, it helps to have some experience, then re-read the page.
  If that page doesn't do it for you [start you reading, comprehending and calculating #'s/equations], like it was for me, more study may be needed.
  Great Link, the one I've been 'without' for some time now, has 'seeded' my ability to read/comp/equate !!!
  The reading rate increased with successive read throughs, the first time comprehended could be considered 'slow', but not really...when you consider the 'density' of the info.
  Very valueable stuff.
  Just looking at the first and second schematics [second is higher gain] tells' alot about how to design for gain amounts.
  A great page to save as favorite or print out, as remembering the calcs for R1, R2...etc. is a bit much.
  For me it's a super great read, Huge...Thank You !!!

[seanm]

The one thing that worries me about this article is the huge reliance on hfe. This means if you use a transistor with a huge hfe range, such as an MPSA18, it is hard to know if it is biased right, It seems there should be a way to not rely on a specific hfe. Or maybe I am just worrying too much.

[(doug harrison)]

Pretty helpful, Mr. Huge. I usually just breadboard a transistor and three trimpots, then set them for the best sound and the best picture on a scope. Now I can understand more clearly how and why things work the way they do. The part about Ib was particularly helpful. And for Ic, I guess you just pick a current you want and design from there? For hfe... you could measure that with a multimeter.