[Elecraft] K1: DC Voltage Check Slightly Off

[Don Wilhelm]

Yes, you should round up to 3.8 volts.  There will be some variability 
due to DMM differences, and some further variability due to component 
tolerances.  When a value like 3.8 is specified, rounding to one 
significant digit is what is intended.

Most of the values listed in the DC voltage charts are the result of 
actual measurement from a properly working unit, so pay attention to the 
conditions listed for any measurements (band, power setting,  supply 
voltage, etc.) - do not use more decimal places than what is listed in 
the chart even though your DMM may show the value to a large number of 
decimal places.  A variation of 10% is usually within the expected 
tolerance range.

73,
Don W3FPR

MGFoster wrote:
> I've reached the first DC Voltage Check in the RF Board assembly and 
> for the AF amplifier (LM386N-1, component U3) pin 5 check the Voltage 
> should be between 3.8V and 4.2V.  My DMM measured 3.786V.  Is this 
> significant, or should I just round up to 3.8V?  All other voltage 
> check points were within predicted range.