Two 1k Tempco's instead of a 2k?

sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

Is it possible to use two 1k 3500ppm Tempco's in series instead of a 2k Tempco?

Are there any drawbacks to this?

Cheers,
michel

fonik · Posted: Mon Nov 13, 2006 7:28 am Post subject:

i really don't know. i'm just curious:
do you ask this question in general or do you have a specific design in mind?

fonik · Posted: Mon Nov 13, 2006 7:38 am Post subject:

could it be, that you refer to the SN voice?
as long as the temco is in the feedback path of the inverting amp that mixes the incoming control voltages, we should easily be able to use a 1k tempco and divide the values of the resistors R33-R61 by 2 to maintain the ratio... that's exactly what ray did with his new improved VCO:
http://www.musicfromouterspace.com/analogsynth/August2003VCO.html

cheers,
matthias

sneakthief · Joined: Jul 24, 2006 Posts: 569 Location: Berlin

Fonik - that's exactly what I wanted to do Smile

I wonder if a 2k Tempco is more stable and/or accurate than a 1k Tempco.

cheers,
michel