using new technology on old machines

tony duell ard at
Tue Jun 16 00:07:14 CDT 2015

> > But if you are going to repair/restore something then IMHO it makes a lot of
> > sense to have common spares around.
> Agreed! But you generally tend to accumulate those spares *after* you have been involved in that particular 

True. I wil bet you didn't have firearm spares when you first started out either....

> area for a while. Coming into it from scratch, you might not even know which parts you're most likely to need. 
> And buying every common-ish part that you might need is an expensive proposition.

That is also true. And it's not obvious what is common and it very much depends on the machine you
are working on. If you fix 1980s home micros you probably have a few 6502 and Z80s on-hand, but they
 are not a lot of use in a PDP12.


> extras. But I don't have a single 2N3904 in my junk box, because I don't think I've had to replace one in the last 

I use them all the time for LED drivers, etc....

> 30 years, just based on the kinds of things I've been working on. So it's not my go-to part. Now, 10k resistors 
> and 0.1uF ceramic caps... those things I use a lot. :)

And to get back to that darn M452 module that started this, it is _precisely_ those sort of R's and C's you need
to change its frequency!


Mark J. Blair, NF6X <nf6x at>

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