Re: [EE] solid aluminum caps on 60hz

On Thu, 15 May 2025 at 12:11, madscientistatlarge <
[email protected]> wrote:

> I'm building a small (2A 12v) power supply off of a transfomer so 60Hz.
> Is using the solid caps a problem?  I understand they have a reduced
> impediance and am worried about the power on current initially charging the
> cap and during each half cycle when the caps charge back up.  Thank you.
>
> Peripheral but some relevance.


Placing a series "spreading resistor" between the rectifier output and the
filter capacitors will increase the conduction angle of the diodes. This
reduces peak current and  also reduces RFI from the rectifiers which do not
switch so sharply.

The resistor dissipates some energy and drops peak voltage. It's value
wants to be small enough to not reduce available output at target voltage.



                       Russell