Archived from groups: rec.audio.opinion,rec.audio.tech (More info?)
Detector195 wrote:
> oatteaseffen@hotmail.com (Paul) wrote in message news:<462bba80.0411111654.688f1858@posting.google.com>...
> > Bipolar Transistor Power Amplifier Bible
> >
> > I can't imagine a better book about push-pull, audio bipolar power
> > amplifiers. Self covers virtually every possible configuration with
> > circuits, notes, simulations and measurements. This book includes an
> > excellent chapter on power, heat and reliability based on many years
> > of design , manufacturing and field service. He is truly an expert in
> > all aspects of this amplifier topology.
> > He doesn't hide his disdain for MOSFETS, single-ended amplifiers and
> > other "subjectivist" high-end concerns. Contrary to the findings of
> > many others in this field, Self finds Total Harmonic Distortion the
> > only measurement of amplifier quality that matters. He isn't
> > convincing to this reviewer.
> >
> > A "must have" book for anyone designing audio power amplifiers.
>
> Does this bible include IC power amps? Below 100 Watts, is there any
> reason to do it with discrete transistors these days? The MOSFET
> designs I have looked at all required relatively high power supply
> voltages, i.e. they were inefficient. A pair of LM3886's in bridge
> mode seems like the way to go.
The Mosfet designs simply need a decent drive voltage for their enhancement mode output devices. This can be
done by running the previous voltage gain stage off a slightly higher voltage than the mail rails at mere
milliamps. It has other benefits too - such as avoiding saturating the drivers and results in lower Miller
capacitance effects in the drivers.
Graham
Detector195 wrote:
> oatteaseffen@hotmail.com (Paul) wrote in message news:<462bba80.0411111654.688f1858@posting.google.com>...
> > Bipolar Transistor Power Amplifier Bible
> >
> > I can't imagine a better book about push-pull, audio bipolar power
> > amplifiers. Self covers virtually every possible configuration with
> > circuits, notes, simulations and measurements. This book includes an
> > excellent chapter on power, heat and reliability based on many years
> > of design , manufacturing and field service. He is truly an expert in
> > all aspects of this amplifier topology.
> > He doesn't hide his disdain for MOSFETS, single-ended amplifiers and
> > other "subjectivist" high-end concerns. Contrary to the findings of
> > many others in this field, Self finds Total Harmonic Distortion the
> > only measurement of amplifier quality that matters. He isn't
> > convincing to this reviewer.
> >
> > A "must have" book for anyone designing audio power amplifiers.
>
> Does this bible include IC power amps? Below 100 Watts, is there any
> reason to do it with discrete transistors these days? The MOSFET
> designs I have looked at all required relatively high power supply
> voltages, i.e. they were inefficient. A pair of LM3886's in bridge
> mode seems like the way to go.
The Mosfet designs simply need a decent drive voltage for their enhancement mode output devices. This can be
done by running the previous voltage gain stage off a slightly higher voltage than the mail rails at mere
milliamps. It has other benefits too - such as avoiding saturating the drivers and results in lower Miller
capacitance effects in the drivers.
Graham
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