Home made Doug Coil Machine

These pictures were sent by a friend showing his Doug Coil Machine setup.

Dear Jim and Carol:

Here is a glimpse of what I have to go through to run a few different frequencies on my Doug machine.  Notice I have 4 different coils that have to be combined with various capacitors to hit the harmonic.  My setup is crude at best, but does work if I have the energy to use it.  It is a challenge also to use my massive spread sheet and capacitor in series chart to try and match up the right capacitance to the right coil to hit the frequency I want.  Just explaining it makes me tired!  Hope to hear from you soon.