2017-03-22 23:08:59 UTC
but just cannot afford the $5000 to $10,000 price?
Well, my friend, do not despair. Such an amplifier can be
obtained for about $30 in parts plus the DIY labor.
THIRTY FUCKING DOLLORS for a world-class, high-end power audio
amplifier!!! How is that possible?
It is, my friend, the magic of the electronics revolution.
Note that there are on this group certain "professional" assholes
who will now have their face rubbed into the bitter truth. These
"one-trick ponies" could never fathom the possibilities.
Here is the schematic of an audio power amp, based on the LM12
operational amplifier integrated circuit, that can provide at
least 50 Watts (per channel) of output power. The amp itself
is shown in the upper figure:
That's it. For $30 pocket change you can have the absolute
BEST audio power amp in the entire fucking world.
Actually, I am ignoring the necessary power supply which must
provide at least a +/- 18 volt swing between the power rails,
but that should be only about $25 extra.
But how does this power amp perform?
Examine the bottom figure. Here we see the total harmonic distortion
for this particular power amp.
Now, the total harmonic distortion is only one of many possible
methods of measuring amplifier performance, but since it is almost
an industry standard we include it here.
Holy fucking shit! Look at that bottom curve which applies to
a 50 watt power amp. The distortion is, for all practical purposes,
almost non-existent. This performance is nothing short of phenomenal --
and for only THIRTY FUCKING DOLLARS!
Unfortunately, the LM12 op amp is no longer in production, but
if you search hard enough you should be able to find a close equivalent.
The op amp design, of course, includes other phenomenal characteristics
such as extremely low input noise, extremely high input impedance,
and extremely low output impedance. These remarkable parameters make
the LM12 very easy to interface with other components such as pre-amps,
So let those "professional" assholes go and fuck themselves. They
have missed, because of their stupidity, the electronics revolution
and now can drop dead.
Oh yes, I almost forgot. The GNU/Linux spice program can be used
to aid you in your design quest. GNU/Linux spice, free of charge,
is the rival of thousand dollar commercial software.
Let those "professional" assholes read it and weep.
Ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha, ha!