(6) Adjustable Zener - 2½ to 36 V (or Audio Amp) Genuine Texas Inst. TL431C

Description

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TL431C ZENER / Shunt Regulator
(6) - Genuine Texas Instruments (TI)
Datasheet:
https://linearparts.com/documents/TL431a-ti-32pg.pdf
"The Adjustable 2½ to 36 Volt Zener" (or 400 mW Audio Amp)
Experimenters love this simple but versatile
programmable
regulator. A TL431 and a single small trimmer pot will replace a whole assortment of zeners. Better yet, since the voltage is continuously adjustable, you will do it with
better precision
.
Never settle for a 'close' fixed zener value again. After all, what good is a 1% zener, if it's the wrong value?
Basic Application. See datasheet at
https://linearparts.com/documents/TL431a-ti-32pg.pdf
for other configurations.
Setting the voltage is easy. See datasheet for simple algebra used in various configurations.
This device works as a current shunt, just like a zener. It will sink 1 to 100 mA to maintain a precise
Positive
or
Negative
voltage from 2½ to 36 VDC. All you need is the series current limiting resistor (as with zeners) and a voltage divider consisting of two small resistors (R1/R2) to program the voltage.
Replace R1/R2 with a trimmer for a precision adjustable zener diode.
Add a 'pass' transistor for higher load currents.
Can be wired as an adjustable, constant current source/sink too!
Need a simple AUDIO AMPLIFIER?
See the 2 examples below.
Check the datasheet. It has many applications to spur your imagination. This 'zener' can even be used as a
microphone / phono amplifier
(left) or as a Crystal Radio amplifier at
https://linearparts.com/images/TL431-xtal-radio-amp.gif
using a 32 Ohm speaker without a transformer! (See our other auctions for transformers and 32 Ohm speakers.)
Popular TO-92 3-terminal package. Only 3 resistors (not included) are needed to make a
precision
regulated voltage source. The perfect replacement for even tight tolerance zener diodes.
431-6
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