Tempco Resistors (ONE MORE TIME!) was: thermal tips re expo c onve rters

[Bissell, Harry]

Big Briar (Bob Moog) sells them (1Kohm) for $10. They are listed in the
etherwave modification instructions. Harry Bissell...  PS you could use 2 -
1Kohms in series, but that would be awful expensive. :-(

> -----Original Message-----
> From:	List, Christopher [SMTP:Chris.List at sc.siemens.com]
> Sent:	Monday, February 15, 1999 1:27 PM
> To:	synth-diy
> Subject:	Tempco Resistors (ONE MORE TIME!) was: thermal tips re expo
> conve rters
> 
> I believe Paul Schreibler still has 1K temcos for sale - they're just as
> good as the 2K if you adjust some other resistor values. I have a few
> tempcos, but they're all reserved for personal use.
> 
> As I've mentioned before,
> 3500ppm, 1%, 2K tempcos (actually any kind of tempco) can be purchased
> from;
> KRL/Banty Components
> Manchester, NH
> USA
> 
> - you can get their number from directory.
> 
> You want part #C-2AQ. Some of their models have a high inductance and
> won't
> work as the feedback resistor in a summing op-amp, but the C-2AQ works
> llike
> a charm (you can read my whole saga of triumph, defeat and triumph again
> with the high-inductance models in the 1996 archives :). They have a
> minimum
> order of $100, and the resistors are about $3 a piece. I ordered a batch
> about 2 or 3 years ago and sold extras to the list.
> 
> Trust me, getting tempco resistors is no big deal if a few people chip in
> and someone's willing to organize it and mail them out. They're a simple
> solution and not all that expensive (what's an extra $2 or $3 per VCO? how
> much will you spend on trim pots and chips for a heater solution?) - All
> this heater stuff seems like way too much extra work and circuitry to me.
> 
> - CList
> 
> 
> > -----Original Message-----
> > From:	Steve Varner [SMTP:varner at k-online.com]
> > Sent:	Monday, February 15, 1999 12:43 PM
> > To:	synth-diy
> > Subject:	Re: AW: AW: [Re: thermal tips re expo converters:]
> > 
> > OK folks...my brain hurts now, thank you very much...
> > So, if I'm using a ribbon controller or a theramin controller or
> > something, I
> > shouldn't worry about any of this. Right? It seems some of you are
> saying
> > that
> > isolation has cons as well as pros. My plan was to try to avoid
> > temperature
> > compensation because of the tempco resistor's cost and hard-to-find
> > nature. If
> > I'm not getting much benefit from isolation because of cooling and/or
> loop
> > problems, I'll just leave it off and heat the chip sans styrofoam.
> Again,
> > any
> > 2K tempcos for sale?  :-0
> > 
> > SV
> >