This is a Voltage regulator with high input voltage up to 450V DC using IC LR8N3
Maximum output current is between 10mA to 30mA.
Minimum input voltage is 13.2V.
Output voltage is adjustable between 1.2V up to 435V DC, depends on the value of R1 and R2.
Parts list:
IC LR8N3
Diode 1N4007
Resistor 68K (2pcs)
Resistor R1 and R2 (calculate the value by formula below)
Bridge rectifier DB107
LED
Capacitor 10uF 400V
Capacitor 1000uF 16V (for 12V output)
Capacitor 100nF
Circuit for 12v output:
For 12v output you need 16v capacitor, For 24v output you need 35v capacitor, For 350v output you need 400v capacitor, and so on.
Circuit for adjustable output:
Formula to calculate the output voltage based on value of R1 and R2 in ohm:
Calculation for 12V output, (R1 must be 51K and R2 must be 330K):
You can order the PCB from PCBWay:
https://www.pcbway.com/project/shareproject/Voltage_Regulator_LR8_57b21cb8.html
Watch the video:
