Homebrew PCBs

zzzzzzZZZZZZAAAAAPPPPPP!!!!!!!!!!!!!!!!!

On 3/9/10, awakephd <a_wake@earthlink.net> wrote:
> I'm not sure what the big deal is about printed-on fuses. I've done that
> many times -- in fact just the other day, when I made a bone-headed
> connection on the 170V PWM motor control board I was working on, several
> traces turned into instant fuses!
>
> I'm embarrassed to confess that I forgot that the "ground" on the board was
> NOT at the level of ground in the wall when I attached the ground lead from
> the o-scope. Fortunately the board "fused" rather than the o-scope. It
> destroyed two IC's on the board in the process, but that was a small price
> to pay compared to fixing or replacing the scope!
>
> And yes ... the board went in the trash and I started over -- much more
> carefully this time! And yes, the new board works perfectly.
>
> --- In Homebrew_PCBs@yahoogroups.com, Stefan Trethan <stefan_trethan@...>
> wrote:
>
>> You appear to be under the impression that fuses should be replaceable?
>>
>> Usually this is not the case, fuses are there to prevent fire and/or
>> other danger if something goes wrong.
>> Changing the fuse will not solve the problem, since it blew for a reason.
>> You are supposed to throw the thing out once it is broken, not repair it.
>> ;-)
>>
>> The only situation where a replaceable fuse makes some sense is if you
>> have like an outlet or something to which the user can connect stuff.
>> But more and more the trend goes towards not providing a user
>> replaceable fuse because people can't be trusted to replace with the
>> same rating, no matter how many warnings you print on.
>>
>> ST
>>
>>
>> On Tue, Mar 9, 2010 at 9:57 PM, David Griffith <dgriffi@...> wrote:
>>
>> > I'm curious why someone would want to use such a fuse in the first
>> > place.
>> > How do you replace it?  Are there pads for adding a fuse holder after
>> > the
>> > PCB fuse blows?
>> >
>> > --
>> > David Griffith
>> > dgriffi@...
>> >
>>
>
>
>


-- 
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
NAQCC 3123, SKCC 4628, FPQRP 2003