[sdiy] SMD Tempco Plea for Help

[Tony Clark]

> My experience of SMD tempcos is that as long they are in the vacinity 
> of the transitor pair, they work fine..........no glue, no contact 
> even.........tell me, are you designing your own pcbs?.............I 
> have tempcos that sit ver near the transistor pair in my 
> oscs.............I think that small-ness actually helps a lot, lesser 
> area to be affectd by the ambient temperature....

   I also agree with this, you do not need to have direct physical 
contact with the tranny pair.  Remember in the old days, those wire-wound 
tempcos were HUGE and with that much mass, you needed to make sure that 
it was bonded to the tranny so that the ENTIRE mass heated/cooled the 
same.
   With these teeny SMT tempcos, they respond a bit faster so it's not 
nearly as crucial, I believe.  But if you want to be sure, just make sure 
that your tranny pair is in good contact with the PCB, that way both the 
SMT resistor and tranny pair are following PCB temp more directly.

   Cheers,

   Tony

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