Re: Small carbon composition resistors

On Fri, 4 Sep 2009 20:57:53 -0700 (PDT), George Herold
<ggherold@xxxxxxxxx> wrote:

On Sep 4, 10:18 am, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
On Fri, 04 Sep 2009 05:51:48 -0700,





"JosephKK"<quiettechb...@xxxxxxxxx> wrote:
On Mon, 31 Aug 2009 06:59:36 -0700, John Larkin
<jjlar...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

On Sat, 29 Aug 2009 10:59:10 -0700, Archimedes' Lever
<OneBigLe...@xxxxxxxxxxxxxxxxxx> wrote:

On Sat, 29 Aug 2009 09:37:50 -0700, "RST Engineering - JIm"
<jwei...@xxxxxxxxx> wrote:

Back in  "the day" I specifically remember carbon comp 1/8 watt in all the
standard values from 0.5 ohm to 22M, but I haven't seen any in the better
part of 40 years.

Jim

"Spehro Pefhany" <speffS...@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:ng4g95986kjs376bcrf4adbrl2oegk3akg@xxxxxxxxxx

Trying for something with less surface area. I might be able to use
BJTs.

 The closest one can come is likely the composition glass bodied style
mil spec jobs,that were like 1%. They were the "precision resistor"
before metal film.

The real precision resistors were wirewounds. You could buy 0.01%, 5
PPM wirewounds in 1940.

John

Sure, but they were rather inductive.

Google "Ayrton-Perry winding"

John- Hide quoted text -

- Show quoted text -


OK this did not produce any 'good' hits for me. Can you elaborate?

George H.

Strange. Google gives me 15,300 hits, most of which look relevant.

Like this:

http://books.google.com/books?id=kWa4ahQUPyAC&pg=PT423&lpg=PT423&dq=Ayrton-Perry+winding&source=bl&ots=3WQIf59qyv&sig=pOW88p0WkA03K7skicHApY3J92w&hl=en&ei=Ju6hSoHeHo_0sQOn8IWNDw&sa=X&oi=book_result&ct=result&resnum=10#v=onepage&q=Ayrton-Perry%20winding&f=false

John

.

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