[sdiy] MOTM 310/300 debugging discoveries & dual FET question

[Aaron Lanterman]

On Fri, 19 May 2006, Aaron Lanterman wrote:

> Short version: My MOTM 310 and 300 VCOs each use a dual LS3854 FET.  The 
> oscillator cores of both circuits appear identical. With the power off, in 
> situ, the source-drain resistances of both FETS in the 310 measure 600 ohms. 
> But, in situ, one of the source-drain resistances measures 600 ohms, but the 
> other measures 25K. Does this mean the LS3854 in the 300 is buggered?

Clarification in the second to last line - it should read:

"But, in situ, onje of the source-drain resistances OF THE FETS IN THE
MOTM300 measures 600 ohms, but the other measures 25K."

- Aaron