This is precision high voltage regulator circuit diagram based 3 terminal adjustable regulator LM317L IC.
The circuit require input voltage Vin ≥ 178V and can provide output voltage ( V out) between 8 V to 160 V @ 25 mA current output.
Precision high voltage regulator parts list: R1 : 100 K / 0.5 W R2, R6 : 1 K R3 : 100 ohm / 0.5 W R4 : 100 ohm R5 : 1K5 R7 : 20 K / 5 W ( adjustable) R8 : 27 ohm C1, C2 : 1 uF mylar type D1 : 1N4733 (6.2V) D2 : 1N4001 D3 : LM 3390 Q1, Q2 : NSD 134 or similar IC : LM 317L
Note : Q1, Q2 require adequate heatsink.
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