921 tempco

analogmonster · Post by **analogmonster** » Tue Oct 20, 2015 11:23 am

Hi,

which type of tempco is used for the 921 VCO, and how is it mounted?

Thanks

MC · Post by MC » Tue Oct 20, 2015 5:37 pm

1K tempco in feedback loop of IC502 combined with SG3821 transistor array. The schematic shows the tempco to be thermally coupled (dashed line) to the SG3821.

http://experimentalistsanonymous.com/di ... %20921.jpg

analogmonster · Post by **analogmonster** » Wed Oct 21, 2015 1:26 am

Great, thanks, MC.

mgrainger · Post by **mgrainger** » Mon Nov 30, 2015 9:31 pm

In the early production models I believe it was mounted below the I. C. Device covered in heat sink compound.

MC · Post by MC » Fri Dec 04, 2015 1:59 am

mgrainger wrote:In the early production models I believe it was mounted below the I. C. Device covered in heat sink compound.

Nope.

It was a modification designed later. Was never implemented in production.

Moog Music Forum