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Wallwart (adapter) with Vout = 24 VDC used as V1.
AC 110v/240V DC 24V 1000ma Power Supply US EU, $ 1.99, shipping $ 1.24.
TL431A are here: FreeShip 50pcs TL431A, $ 0.96 lot.
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Dependence of current on ambient temperature at Rload=500 Ω:
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In range 0°C-75°C, TCI is about 40 nA/°C.
AC 110v/240V DC 24V 1000ma Power Supply US EU, $ 1.99, shipping $ 1.24.
TL431A are here: FreeShip 50pcs TL431A, $ 0.96 lot.
__Dependence of current on ambient temperature at Rload=500 Ω:
___In range 0°C-75°C, TCI is about 40 nA/°C.
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