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On Friday, 22 May 2015 14:17:19 UTC+1, rick wrote:
On 21/05/2015 20:43, nt wrote:

I take it this is a classified project,

Not sure why you think that .... this is a home build project to control

well, you avoided giving us the relvant info, until now

the speed of a computer fan ... thus allow cooling of a comms cupboard
that gets too hot in summer.

The circuit is based on the cct he
https://www.dropbox.com/s/rewcotpvkd...rcuit.jpg?dl=0

They use a bare board ... for safety & longevity building this into al
aluminium case. That is why question of where to mount thermistor comes
from.

It would work gluing it to the case, but woudl give a time lag in
operation, resulting in poor temp control and wasted energy. I'd put it
near top of cabinet in the airstream.


NT

Some good old classic components in that circuit

Andrew