[sdiy] 1K or 2K Tempco ?

[Rob Keeble]

Hi,
Oakley Sound Systems have 1K 3500ppm 1% Tempcos for sale
www.oakleysound.co.uk at UKP 6.00

I now have 1870 ohm 1% 1W 3500ppm Tempcos for sale, as used in ARP modules.
These have been custom manufactured and are a similar price - UKP 7.00.
Contact me at info at emulatorarchive.com for information.

I will also have 100 and 200 Ohm 1% 1W 3500ppm Tempcos for ARP2500 modules,
and I might get some 1K 1% 3600ppm Tempcos manufactured for SSM VCO's. I
have found a friendly UK manufacturer who can make high quality Tempcos at
smallish volumes (under 50). As I need a few for my DIY projects, spares one
are available for minimal cost.

Farnell and probably other suppliers sell 1K 3000ppm PTC's for around UKP
2.00. These are okay for filters if you don't need spot on tracking of self
oscillation.

Regards
Rob
www.emulatorarchive.com


Hi again,

Still looking for a 1K Tc for the SEM module.
But I just noticed that  Midwest Analog sells
2K +3500ppm/°C... So I was wondering if
this could be used in the SEM VCO instead,
and if other components values need to be
modified accordingly, or if the 10K trimpot
(T6) is enough to compensate the difference ?

Thanks,
JB