[sdiy] SSM2044 Filter schematic??

[harrybissell]

I'd avoid calling the Q81 a thermistor as it is likely to mislead newbies
who WILL find thermistors in catalogs easily.

The Q81 has a positive temperature coefficient of +3300 ppm. It is (was)
made as a wirewound resistor using an alloy that has the correct
characteristic.

They could be any resistance value you like, with 1K, 1.87K and 2K being
the
most popular synth values

KRL/Bantry is the only mfg. i aware of that makes the wirewound types...
they are
quite expensive

There are newer, film versions. Precision Resistor makes them and I think
Panasonic
'might' as well.  These are usually +3000 ppm or +3500 ppm... and a lot
less expensive

The best name to call these might be "tempco" resistors :^P

H^) harry

phillip m gallo wrote:

> Ryan,
>
> Q81 was a series or type qualifier for a Tellabs thermistor.  After
> specifying this type you would then specify it value.
>
> You'll find Precision Resistor or Panasonic has a pretty good range of
> thermistors or thermosensitive resistors.
>
> regards,
> p