Re: [AH] So many 1n400x diode failures

From Kenny Balys
Sent Sat, Mar 16th 2019, 01:40

1 set of 1N4002's, they were in a circuit with +/1 15 V rails.

Another 2 sets of 1N4004's in a circuit with a single +35V

I checked my mains and they are not at 220V, more like 232V
and it seems to vary a little bit. So I guess things are
going to be running a little hotter.

Why are mains voltages increasing? is there a good reason
for this?

In every case, I replaced the diodes with 1N4001's (which
are good to 50V of course). The master decoupling caps were
also changed. Sadly, I cannot seem to find brand new
axial electrolytic capacitors so I have to put in radials.
Visually its not as nice but then what matters most is
that the gear works.

On 16.03.19 01:09 , Mike Beauchamp wrote:
>
>
> On 3/15/19 8:15 AM, Kenny Balys wrote:
>>
>>
>> In the past month I have had 3 pieces of equipment with bad
>> 1N400x diodes functioning as rectifiers in a power supply.
>>
>
> Which 1N400x Kenny? They go from 50V to 1000V... curious to see what part was
> used, and what voltage it was operating at.
>
> As you probably know, home mains voltage has been steadily increasing. Just
> wondering if the manufacturers specced a part that was only within 20% of it's
> operating limits and is now operating beyond that.
>
> Mike
>
>