WB testing problems

[bcroe at juno.com]

Steve, 

Possibly the problem is your voltmeter.  If it is not a high 
impedance (usually digital) type, it may load down the 
circuit.  Try connecting your meter to J12, and through a 
100,000 ohm resistor to the + 4V end of R38.  If you see 
the same 6.75 volts, it's just the meter.

98K is plenty close enough for R38.

Bruce Roe

On Fri, 12 Apr 2002 21:31:55 -0400 Stephen Andersen 
<SAndersen at advan-tek.com> writes:
> Okay, I am testing out my assembled WB board using the 
> www.diy-wb.com instructions.  I worked up thru step 14, 
> but I ran into a wall at step 12.  Measuring from pin 
> 5 on U3 to J12, with 14 volt input, I get 6.75V.  
> According to the instructions, I am supposed to get 
> 7.9-8.0 volts.  It says to check R38, C12, and ISO1.
> Since I dunno how to check C12 or ISO1, I replaced
> them with extras.  I also checked R38 and got 98k Ohms.
> It is supposed to be 100k.

> Steve
> andersen at advan-tek.com
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