[R-390] Sherwood

[Lester Veenstra]

All the more reason to ask for a published schematic


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Bob Camp
Sent: Sunday, October 20, 2013 10:25 AM
To: R-390 at mailman.qth.net list
Subject: Re: [R-390] Sherwood

Hi

Which is why you probably should re-design it with up to date parts if you
wanted to keep selling them. SMT has pretty much taken over in the world of
semiconductors. There are some parts (or even categories of parts) that
simply are not available in a "hand solder" sort of package. Yes for a home
build you can find this and that. For a commercial product that's expected
to last, off to the pick and place machine 
.

None of this is a knock on the fine design job he did on the SE-3, it's just
the way the semiconductor business has gone over the last two decades. I
doubt that we have done a single "non SMT" design at work in the last 10
years. We've probably done several thousand SMT designs. Just to be clear -
to me SMT is anything that is fine enough pitch that hand solder is not
economically practical. By that definition a SOT-23 is not a hand solder
part (yes I've been hand soldering them since the 1970's) in a deliverable
product. 

Bob

On Oct 20, 2013, at 9:33 AM, frank hughes <fsh396ss at gmail.com> wrote:

> Hi,
> One of the interesting things Rob mentioned to me when I bought an 
> SE-3 years ago was component availability.
> 
> The issue was difficulty obtaining some of the components that the 
> design required, sounded like there were some items being discontinued 
> that he needed.
> 
> Must be a pain to keep a design going and avoid having to re-design 
> just to keep up with component availability.
> Frank
> KJ4OLL
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