DIP packaged resistors???

Christopher_List at Sonymusic.Com Christopher_List at Sonymusic.Com
Tue Apr 29 15:07:08 CEST 1997





> In building my analog circuits, I often have 1 or 2
> heavily used resistor values (like 100K) and it
> occurs to me that I could save board real estate if I
> used a DIP packaged isolated resistor network in
> place of my 8 discrete 100K resistors.  The Mouser
> catalog offers these as thick film resistor networks
> with 2% tolerance and TC of 100 ppm in a DIP package.
>
> Aside from these obvious specs, can anybody offer any reasons why this
might be a bad idea????

Why bother?
Why not just take regular resistors and solder them in vertically, so that
one of the leads runs parallel up the side of the resistor and bends at the
top? You can stick your resistors into pads with a .1" spacing. Korg used
to do it, Roland used to do it, I do it....
Maybe it adds extra noise or stray capacitance, but really, how much?? I
suppose it's a little more convenient from the perspective of clipping
leads and doing the soldering to use arrays, but that's about it. Mmmm I
guess the arrays will look better. OTOH, arrays are much more limiting as
far as what you can do with your layout.

But this is coming from a guy who thinks etching PCBs is a big waste of
time. I do everything with protoboard. I mean take that delay I built - 2
hours start to finish for the PCB (not counting the time I spend doing a
layout on the computer for the board - because I'd have to do the same
thing if I did etching). How long would it have taken to do an image
transfer, etch, drill and solder? - AND clean up the chemicals and dust
etc, etc - And what if I screwed up my PCB layout? How long would it have
taken to fix? :) With protoboard, fixes AND ENHANCEMENTS are easy! And you
know how many jumper wires I needed with my layout? Three! - and it's small
too!

...Just my $0.02

- CList





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