When "we" were manufacturing in the '90s the safe storage time for SMD was
around 3 to 6 mths. Surfaces weren't 'fresh' after that. Some was wave soldered
some reflow.
If that is a slow moving component then maybe they coated it with a solder-thru
protective layer? Doesn't seem like they used a
Maybe I should just ask digikey, which is my supplier in this case.
> On Aug 20, 2019, at 2:13 AM, johnk wrote:
>
> When "we" were manufacturing in the '90s the safe storage time for SMD was
> around 3 to 6 mths. Surfaces weren't 'fresh' after that. Some was wave
> soldered some reflow.
> If
Thanks, John. I was at a dead end with this circuit. I tried several values
of resistors in series with the gate. That didn't work, but disconnecting
the 2N7000 and grounding the gate on the NDP6020, did turn on the LED.
I will try the TSC426. The only reason for the 74HC04 was to invert the
Interesting project Mitch. I too love alphanumeric displays!
Bill
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My guess would be ENIG like on a PCB. Electroless Nickel Immersion Gold.
The data sheet or the vendor's website would tell you the exact finish.
Terry
On Saturday, August 17, 2019 at 9:56:24 PM UTC-5, Paul Andrews wrote:
>
>
> What is the gold/amber colored coating on the contacts of this chip?
That was what I assumed until I reflowed it. I wish I had photos of what it was
like before I used my hot air rework station to take it off and reapply it. The
gunk cleaned off before I resoldered it.
> On Aug 20, 2019, at 10:14 PM, Terry S wrote:
>
> My guess would be ENIG like on a PCB.
Also, it would be possible that this is some kind of additional soldering
component, to make the part suitable to use as a module, to increase the
future solder point.
For example, if you want to use a chip on a small pcb, which is later
machine-soldered on a bigger pcb, it can be a problem,
You don't have to use both, just an option with the board. You can
configure them to do different things for some variety or just use one in
your design.
Alas, the large tubes are an increasingly rare commodity...unless Dalibor
shakes things up again!
On Tue, Aug 20, 2019 at 8:16 AM Bill
I like the dekatron setup... I wonder why it's two tubes? I'm curious how
this works with two tubes. I picked up a sealed box of 25 OG-4 this past
year and have been looking for way to build a 6 digit dekatron clock with
them or perhaps A-101 tubes as I also have a bunch of them. When you
