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)

Documents

Reference

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? )