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Re: conversion of 230 v ac to regulating dc power suply
Hi,
are you sure you mean 50kHz instead of 50 Hz?
***
a rectifier connected to a resistor divider network combined with a capacitor could do the job.
But it´s more guessing with this little bit of information.
Re: conversion of 230 v ac to regulating dc power suply
Hi,
things clearing up...
you want to build a power supply instead of building a voltage measuring circuit.
How much current you want to draw?
do you need isolation? (if not, are you aware of the risc of electrical shock?)
Do you need 5V AND 12V or you want a single output and adjust it to 5...12V?
(if adjust: how? pot, dac...?)
Re: conversion of 230 v ac to regulating dc power suply
Since you do not need any current then a 5VDC to 18VDC power supply operating from 230VAC will be very small and simple.
Ask your teacher how to design it. Hint: An LM317 (1.5A maximum current) is usually used to build a regulated variable output voltage power supply but the LM350 (3A) and LM338 (5A) provide more current.
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