[sdiy] Blown LF13741 and suitable replacement?

[S Ridley]

Measuring approx half mains voltage on class 2 mains equipment "0v" is not
uncommon.  It's generally due to mains filter caps forming a capacitive
divider between live and neutral.  The caps should be relatively small and
mains rated, so should meet safety standards and is unlikely to provide a
dangerous current, but you can sometimes feel it, and on connection or
disconnection to properly grounded equipment a cap may discharge  through
other equipment.  So, probably legally safe, but still cr4p.

Steve




On Sun, 1 Feb 2026 at 01:59, Adam (synthDIY) <synthdiy at adambaby.com> wrote:

>
>
> On 1 Feb 2026, at 10:40, Richie Burnett <rburnett at richieburnett.co.uk>
> wrote:
>
> I'm just cross that I didn't think of the *potential* for damage
> connecting/disconnecting Class-2 speakers to a piece of Class-1 earthed
> equipment.  My multi-meter shows 102VAC between the shield on the audio
> cable coming from the Creative powered speakers and mains earth!  Modern
> gear is probably more tolerant than 1980's technology, but definitely
> something for others to be aware of to reduce the risk of damage to other
> vintage gear.
>
>
>
> 102 volts!!!???
> I would never have thought of this....
>
> A
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