[Ian Bell[_2_]]

Patrick Turner wrote:

Ian Bell wrote:
snip,

If you are worried by magnetically induced noise in WW R, then use a
pair of equal value and same brand with one reverse connected and close
to the other. Thus the magnetic noise of one cancels that in the other.

Interesting idea. Unfortunately it means finding WW resistors of double
the value and it's hard enough finding ones of the original value.

The circuit working should not be that critical.

I just realised series connection would work just as well #:-)


You may have 4 x 5W stacked together, with short leads, correctly phased
to minimise hum....

Using 5 x 220k parallelled metal films each of 1/2 a watt gives you 44k,
5W, and maybe excess noise is lower,

Unlikely as the noise seems to get worse for higher resistances - on the
other hand using a couple og .5W in series might be worthwhile.

but Johnson is the same as a 44k single R.....

Of course.

Cheers

Ian

Patrick Turner.