How to Set The Bias Voltage
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Posted by Glenn Gundlach on July 22, 2008, 12:32 pm
Please log in for more thread options wrote: > >news:525b6d81-aead-4324-ae7c-
d2e1a0d4b46b@j1g2000prb.googlegroups.com...
>
> > > In Douglas Self's text "Audio power amplifier design handbook",
there
> > > is a schematic of a 50W amplifier on Figure 7.5, page 194.
>
> > > What value should the bias voltage potentiometer (1k) in the
voltage
> > > amplifier stage be? =A0(Looking for a good starting point.)
>
> > > Is the bias voltage in the voltage amplification stage DC, or
AC?
>
> > > How would I know if the bias voltage is set correctly? =A0Will
the
> > > output sound any better, any worse, or should I wait for the
expensive
> > > MJ4502 PNP transistor to explode?
>
> > > I'd email the author, but judging from the lack of response re:
the
> > > blurred schematic, I'm not holding my breath for a response.
>
=A0Any
<snip slaughter> > Thanks for the info. > > The schematic was in the Class B section of his book. > > Maybe I just need a good third/fourth-year EE introductory text. > suggestions?
> > Thanks, > > Michael Phil Allison gave you the correct answer. Why aren't you happy with it? BTW, ignore Jon Slaughter's 'method'. You'll end up with some very hot transistors that converted themselves from semiconductors to conductors. G=B2 | |||||||||||||||||||||||||||||||
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Posted by on July 22, 2008, 1:29 pm
Please log in for more thread options > On Jul 22, 7:43 am, mrdarr...@gmail.com wrote:
> wrote: > >
> > > > > > > > >news:525b6d81-aead-4324-ae7c-
> d2e1a0d4b...@j1g2000prb.googlegroups.com...
> >
> > > > In Douglas Self's text "Audio power amplifier design handbook",
> there
> > > > is a schematic of a 50W amplifier on Figure 7.5, page 194.
> >
> > > > What value should the bias voltage potentiometer (1k) in the
> voltage
> > > > amplifier stage be? (Looking for a good starting point.)
> >
> > > > Is the bias voltage in the voltage amplification stage DC, or
> AC?
> >
> > > > How would I know if the bias voltage is set correctly? Will
> the
> > > > output sound any better, any worse, or should I wait for the
> expensive
> > > > MJ4502 PNP transistor to explode?
> >
> > > > I'd email the author, but judging from the lack of response re:
> the
> > > > blurred schematic, I'm not holding my breath for a response.
> >
> <snip slaughter>
> > Thanks for the info.
> > > > The schematic was in the Class B section of his book. > > > > Maybe I just need a good third/fourth-year EE introductory text. > Any
> > suggestions?
> > > > Thanks, > > > > Michael >
> Phil Allison gave you the correct answer. Why aren't you happy with > it? BTW, ignore Jon Slaughter's 'method'. You'll end up with some very > hot transistors that converted themselves from semiconductors to > conductors. > > G=B2 I didn't say I'm not happy with his answers. I want to understand more, is all. The whole biasing scheme is new to me. Either way, I think I found a good text: http://www.amazon.com/Introduction-Electronic-Circuit-Richard-Spencer/dp/02= 01361833/ref=3Dsr_1_1?ie=3DUTF8&s=3Dbooks&qid=3D1216743503&sr=3D8-1 Michael | |||||||||||||||||||||||||||||||
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