Re: A non-traditional use of LM431



Winfield wrote:

http://www.abvolt.com/research/publications0.htm

Is that a real circuit, or just a spice-model circuit?

It works either way. You can try soldering iron or spice.

The LM431 has a rather high voltage gain.

It has been accounted for.

It also has
a DC voltage tolerance, up to 50mV, or 2%.

Is it a problem?

I noticed
the LM431 amplifier in your circuit is biased without
any dc feedback

The current flows through R1, the whole receiver circuit operates as the voltage source. The voltage across R1 is proportional to the input current.


, from two 33k resistors (5% resistors)
dividing the 5 volts (5% is a common tolerance for 5V,
where does the 5V come from anyway?).

????
Look at the schematics.

I wonder if in real life some fraction of LM431s might
not be saturated ON or OFF from the random accumulation
of voltage tolerances in the circuit, especially as a
function of the applied 5 volts?

Applied is the current, not voltage.


Vladimir Vassilevsky
DSP and Mixed Signal Design Consultant
http://www.abvolt.com
.

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