[sdiy] OB8 power transformer

[Tom Wiltshire]

Aww, come on! How many people even *know* what the correct fuse is supposed to be for their synth? And how many of those *actually have* a fuse of the correct size and rating handy when one fails? Basically zero people. So after thirty years, the chances of a synth having a massively over-rated fuse in it approach one!


> On 21 May 2024, at 04:46, Michael E Caloroso via Synth-diy <synth-diy at synth-diy.org> wrote:
> 
> And if the bridge rectifier fails with a short on one of the diodes, the fuse will blow before the transformer is damaged.  Unless the owner was an id10t and shorted the fuse.
> 
> MC
> 
> On Mon, May 20, 2024 at 6:16 PM Gordonjcp <gordonjcp at gjcp.net <mailto:gordonjcp at gjcp.net>> wrote:
> On Mon, May 20, 2024 at 05:38:27PM -0400, Peter Pearson via Synth-diy wrote:
> > Usually the bridge rectifiers go bad on those.  Though if it is the
> > transformer you can probably find something that fits physically and
> > matches the output requirements with a little digging.  If it's the bridge
> > rectifier, you want to replace it with a slightly higher amperage rated one.
> 
> FWIW that's about the only time I *would* just shotgun the power supply capacitors.
> 
> I've found maybe about a dozen "bad caps" in various bits of electronic equipment over the years, but half of them had been murdered by shorted bridge rects in linear power supplies.
> 
> Most of the rest were in the same EDP Wasp.
> 
> -- 
> Gordonjcp
> 
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