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Or if the opamp chip was laser trimmed or whatever had to be done to getIt doesn't seem to say much about why the two devices differ, ie if
one is a hand selected from the larger pool.
Michael
I thought it weas SOP to put a 6.8k resistor from output to ground (orSee the thread from January of this year "Singing the praises of the
LM324",
too. It's often-villified for crossover distortion (there *are*
workarounds)
but it works very well for DC-ish applications from rail to rail.
Tim.
Well, the Xover distortion can be a really hideous nasty surprise, if
you
don't know about it in advance.
IIRC it's +, and I remember 2.2k.. OTOH, I rarely use them.I thought it weas SOP to put a 6.8k resistor from output to ground (or
was it + supply) to alleviate this problem.
I see the schems often in projects, and the 324 is available at RadioI thought it weas SOP to put a 6.8k resistor from output to ground
(or
was it + supply) to alleviate this problem.
IIRC it's +, and I remember 2.2k.. OTOH, I rarely use them.
The TL074's are my favorite GP chips.
How many schematics do you see with 324's specified, and how many have
anything there to kill the xover distortion?
It's a Floor Wax....AND a Dessert Topping!I thought it weas SOP to put a 6.8k resistor from output to ground (or
was it + supply) to alleviate this problem.
IIRC it's +, and I remember 2.2k.. OTOH, I rarely use them.
The TL074's are my favorite GP chips.
How many schematics do you see with 324's specified, and how many have
anything there to kill the xover distortion?
The way I've always understood it is that a common collector (emitter"Watson A.Name - "Watt Sun, the Dark Remover"" <NOSPAM@dslextreme.com
wrote
in message news:10pc94f4ue352f2@corp.supernews.com...
You need an Opamp? Y for? A distrbution amp just needs to have a
high
input impedance so it doesn't load the source, and low output
impedance
so it can drive longish cables without rolling off the high freqs.
Something as simple as an emitter follower would do just fine, if
all
you need is unity gain. if you need a bit of voltage gain, then a
single transistor common emitter stage before the drivers with a bit
of
NFB will give you enough gain. And with the NFB, the bandwidth
could be
enough to handle video - 4 to 6 MHz.
An emitter follower introduces harmonic distortion on the order of
1/beta,
no? (A quick simulation with a 2N2222 in LTSpice gives about 3% THD.)
Clearly unacceptable for most audio work. You need extra gain to fix
that.
An opamp is a nicely packaged, inexpensive way to get it.