921 tempco

System 55 • System 35 • Model 15
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analogmonster
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921 tempco

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

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MC
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Re: 921 tempco

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/diy/Schematics/Oscillators%20LFOs%20and%20Signal%20Generators/Moog%20921.jpg
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analogmonster
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Re: 921 tempco

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

Great, thanks, MC.

mgrainger
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Re: 921 tempco

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.

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MC
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Re: 921 tempco

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.
Gear list: '04 Saturn Ion, John Deere X300 tractor, ganged set of seven reel mowers for 3 acres of lawn, herd of sheep for backup lawn mowers, two tiger cats for mouse population control Oh you meant MUSIC gear Oops I hit the 255 character limi

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