Thursday, May 1, 2014

Minima VFO - Under the Microscope

I have been doing some troubleshooting of my Minima VFO, for some reason it is not "talking" with my Minima CPU module. My friend Jeff - KO7M as provided some suggestions for resolution that I am working on.
My Minima VFO
As Built
Just for fun, I took some Microscope Photos while reviewing the circuit and PCB layout for errors. Here are a few for your review.
From Pins 4 and 5 Perspective

The 3.3 Volt Regulator - SOT-89-3
and Its Output 0805 Filter Caps

Power Indicator with its attending limiting Resistor
The Resistor and LED are size 0603

Binocular Core Output Transformer
This is 32 AWG Wire

SMA RF Output Connector
I enjoy working under the Microscope, there are many things that otherwise we would not see.



  1. Which microscope do you use?

  2. John,

    I have the SM-3T, see:

    It is also available with Twin Beams, which I think Jeff purchased.