Turn your old 12V charger into adjustable 3V to 20V power supply
what is Tl431?
The TL431 is a three terminal adjustable precision shunt voltage regulator integrated circuit. With the use of an external voltage divider, a TL431 can regulate voltages ranging from 2.5 to 36 V
I'm using A CCTV camera Power supply 12V and it has a Optocoupler Feedback So I can hack The Power supply (MOD) It using a Voltage Devider That it will create 2.5V on Middle pin of Devider so The Optocoupler led lights up a so pwm starts to increase voltage also increase but voltage deviders voltage is no longer 2.5V so It regulate the voltage to create 2.5V On Devider.....!
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https://electronic/tl431.com.psu
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