"Mad Scientist Jr" wrote in message
ups.com...
220 uF
100uF,
0.1 uF,
0.01 uF
0.047 uF
so I would want variable caps in this range.
Do these exist? Online all I am seeing is ones rated in pF.

Also, assuming I find these, and get them working in the circuit, and
find a desired setting for a capacitor, how do you measure the
capacitance? I have a multimeter but have really only used it to
measure ohms.


You cannot buy variable capacitors with these values, but you could make up
or purchase an arrangement of switches and fixed capacitors quite cheaply
which a) would be the next best thing and b) would directly address your
"how do you measure the capacitance" question. Commercially they are called
Capacitance Substitution Boxes or Capacitance DecadeBoxes . They're not
infinitely variable, of course, but are finitely practical!

John A