[Elecraft] K2 voltage sense

Sun Aug 17 13:16:00 2003

I had exactly the same symptom.  I suspect it is just a case of the voltage
divider not being exactly correct.  I replaced R9 with a 10 turn, 1Meg pot.
You can then tweak the voltmeter to read correctly.

Ken WK6F

-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Ed Milcarsky
Sent: Saturday, August 16, 2003 1:31 PM
To: [email protected]
Subject: [Elecraft] K2 voltage sense

My K2 displays 0.3 volts lower than the voltage I measure on the cathode
side of D10.  (This is after the diode drop of 0.2V)  I verified the voltage
divider R9/R10 had the proper voltage.  Also pin 7 of U3 and pin 5 of the
MCU U6 show the expected voltage.  Pin 1 of U6 reads 5.13V on the DVM.

 Is this within the expected error for the A to D conversion on the MCU U6?

Thanks,

Ed KG4ARN  #3212

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