Tech: Broken Diode. Can't Read Number

[Sparky]

I have a broken diode on a drop target switch on Black Knight. I
can't read the number, but can I replace it with 1N4004? That's what
I have available.

Thanks,

Mark Malmberg (Sparky) - Ceres, California

[Lloyd Olson]

1N4004 will work fine. LTG :)

"Sparky" <movierev...@yahoo.com> wrote in message
news:1349a960-c3b1-4df9...@i41g2000vbn.googlegroups.com...

[Bob in Phx]

How can Lloyd be so sure that this substitution is correct????

The reason is that most coil diodes are 1n4001 which is rated at 35 reverse
volts. The 1n4001 is rated at 280 reverse volts. And of course Lloyd knows
from experience that the 1n4004 will work fine and outlast the factory
design, because Lloyd is the best!!!!

additionally the 1n4001 to the 1n4004 all share the same junction
capacitance of 15 pF. the 1n4005 and up have an 8 pF junction pF.

So the two parts are almost electrically the same, with the 1n4004 being a
more voltage robust part!!!
So, you ask why did the factory use a 1n4001 when it only has a reverse
voltage of 35. Well, the 1n4001 was cheaper!!!!
Hope that helps!!

"Lloyd Olson" <l...@ssbilliards.com> wrote in message
news:2dydnWbKZs8JEXTR...@skypoint.com...

[Mark Clayton]

Actually, a 1N4001 has a PRV of 50V, not 35V or 280V.

You should NOT use a 1N4001 as a coil diode, but on
the switch or lamp matrix, it's fine.

The price between a 1N4001 and 1N4004 is so slight that
for repair it's best to just use 1N4004 for everything.

-Mark
-----
http://pinballpal.com

[KenH]

On Nov 21, 4:11 pm, "Bob in Phx" <rbelis...@cox.net> wrote:
> How can Lloyd be so sure that this substitution is correct????
>
> The reason is that most coil diodes are 1n4001 which is rated at 35 reverse
> volts. The 1n4001 is rated at 280 reverse volts. And of course Lloyd knows
> from experience that the 1n4004 will work fine and outlast the factory
> design, because Lloyd is the best!!!!
>
> additionally the 1n4001 to the 1n4004 all share the same junction
> capacitance of 15 pF. the 1n4005 and up have an 8 pF junction pF.
>
> So the two parts are almost electrically the same, with the 1n4004 being a
> more voltage robust part!!!
> So, you ask why did the factory use a 1n4001 when it only has a reverse
> voltage of 35. Well, the 1n4001 was cheaper!!!!
> Hope that helps!!
>
> "Lloyd Olson" <l...@ssbilliards.com> wrote in message
>
> news:2dydnWbKZs8JEXTR...@skypoint.com...
>
>
>
> > 1N4004 will work fine. LTG :)
>

> > "Sparky" <moviereviews4...@yahoo.com> wrote in message

> >news:1349a960-c3b1-4df9...@i41g2000vbn.googlegroups.com...
> >>I have a broken diode on a drop target switch on Black Knight.  I
> >> can't read the number, but can I replace it with 1N4004?  That's what
> >> I have available.
>
> >> Thanks,
>

> >> Mark Malmberg (Sparky) - Ceres, California- Hide quoted text -
>
> - Show quoted text -

I must be weird, but I love these tech posts...

[John Robertson]

Mark Clayton wrote:
> Actually, a 1N4001 has a PRV of 50V, not 35V or 280V.
>
> You should NOT use a 1N4001 as a coil diode, but on
> the switch or lamp matrix, it's fine.
>
> The price between a 1N4001 and 1N4004 is so slight that
> for repair it's best to just use 1N4004 for everything.
>
> -Mark
> -----
> http://pinballpal.com

That's why we only stock 1N4007s (1000PIV), pennies each, yet cover
anything we run into in the 1A diode range. Reduces some stocking costs.

On the other hand we have dozens of different Zeners...

It was interesting about the capacitance - I had never considered that
factor, however less capacitance would probably be better in a snubber
in any case.

John :-#)#

--
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