R
Ricky Romaya
- Jan 1, 1970
- 0
I want to design and build a very simple audio amplifier to drive my
8ohms speakers from (onboard) pc soundcard. I figure I'm using op-amps.
I'm a newbie and all I know about op-amps are basic, mostly from text
book.
Basically, I'm a little confused. Usually I see that the type of
amplifiers to drive speakers are called 'power amplifiers'. From the
basic building blocks of op-amps, I could only find circuits for voltage
and/or current amplifiers. Do those 'power amps' are really 'voltage
amps', cos I figure the main drive factor for speakers are voltage
variations (voltage are converted into air preassure by the speakers, and
hence creating audible sound)?
Further more, I figure that the input stage of the amps I want to build
will simulate that of LINE-IN/AUX/CD-IN lines found on commercial sound
systems. Anybody knows whether there are standards to the input voltage
and input impendance of those lines (LINE-IN/AUX/CD-IN), and if there
are, what are the values? And how about output impendance standards for
driving 8ohms speakers?
Also, anybody knows how the input parameters (voltage, current, power) to
the speaker relate to the SPL (Sound Preassure Level) generated by it?
This indirectly means I'm asking the relationship of the amplifier gain
to the loudness of the sound generated by the speaker.
Last, but not least, what are the recommended op-amp series for audio
processing (I only know the multi-purpose u741 series)?
Well, that's a long list of questions, and there are more. Any help is
appreciated.
TIA
8ohms speakers from (onboard) pc soundcard. I figure I'm using op-amps.
I'm a newbie and all I know about op-amps are basic, mostly from text
book.
Basically, I'm a little confused. Usually I see that the type of
amplifiers to drive speakers are called 'power amplifiers'. From the
basic building blocks of op-amps, I could only find circuits for voltage
and/or current amplifiers. Do those 'power amps' are really 'voltage
amps', cos I figure the main drive factor for speakers are voltage
variations (voltage are converted into air preassure by the speakers, and
hence creating audible sound)?
Further more, I figure that the input stage of the amps I want to build
will simulate that of LINE-IN/AUX/CD-IN lines found on commercial sound
systems. Anybody knows whether there are standards to the input voltage
and input impendance of those lines (LINE-IN/AUX/CD-IN), and if there
are, what are the values? And how about output impendance standards for
driving 8ohms speakers?
Also, anybody knows how the input parameters (voltage, current, power) to
the speaker relate to the SPL (Sound Preassure Level) generated by it?
This indirectly means I'm asking the relationship of the amplifier gain
to the loudness of the sound generated by the speaker.
Last, but not least, what are the recommended op-amp series for audio
processing (I only know the multi-purpose u741 series)?
Well, that's a long list of questions, and there are more. Any help is
appreciated.
TIA