Capacitive Dropper

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Basic RC Buck

Part Description
C1 Buck step down capacitor
R1 discharge resistor
BD1 bridge diode (4pcs of 1N4007)
DZ1 Zener diode (24V, 12V, 5V, etc)



Maybe it was a simple capacitive dropper power supply (use a capacitor and resistor to go down to about 10-30v then use a linear regulator? )