I have used the LM-324 op amp for several things here over the years
exactly because of its ability to operate from a single power supply, namely +9
volts DC and GND.
---- Original Message ----
From: "gregebert" <[email protected]>
Sent: 4/5/2021 7:29:22 PM
To: "neonixie-l" <[email protected]>
Subject: Re: [neonixie-l] LM-324 op amp
If the loop-gain is sufficiently low, any non-linearities at the output
will get self-corrected (because of the negative feedback) at low-frequency. If
the signal frequency is high-enough, or if there is low-bandwidth in the
feedback network, then the output will definitely behave differently than you
would expect due to the frequency response of the OP-amp (or your feedback
network, such as an RC filter that isn't properly designed).
This is where SPICE simulations are imperative. I wont use an OP-amp
unless the manufacturer provides a SPICE model.
On Monday, April 5, 2021 at 2:53:16 PM UTC-7 Terry Bowman wrote:
On Apr 1, 2021, at 8:52 AM,
chuckrr <[email protected]> wrote:
Doing do on an LM-324
runs the output at around 7.45 volts
when the chip is
operating from a single 9 volt supply.
This reminds me of an aspect of the LM324 worth
including in this thread. It's the kind of real-world issue that doesn't come
up until the second or third chapter of an operational amplifiers textbook. I
doubt that it's a concern for the original poster but I'm a bit hazy on details
myself so I'm hoping that someone else can remind me.
The LM324 is capable of working reliably on
both bipolar and single power supplies. This versatility combined with its low
price makes it a good all-around choice for a wide variety of less critical
applications.
A friend of mine, someone much cleverer than
I'll ever be, ran into what he assumed to be limitation imposed by its single
supply capability. He was designing a circuit with a bipolar PS and simply
couldn't get the 324 to behave. IIRC, he told me that there's glitch that
occurs when the output crosses zero volts while slewing from negative to
positive.
He ended up using something else, problem
solved. Has anyone else heard of this?
Terry
Bowman, KA4HJH
"The
Mac Doctor"
https://www.astarcloseup.com/
“...the
book said something astonishing, a very big thought. The stars, it said, were
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