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I have been able to strip out everything that isn't used to make this oscillate. It is starting to make a little more sense to me now. I did have the transistor drawn wrong on this. It looks like the capacitor is used to slow down the oscillator, but not necessary to make it oscillate...

Sorry about that. When I rearranged that schematic and screwed up that part. I have double checked it again and simplified a little more by removing multiple parts such as the caps. They were in parallel so I just combined them down into one. This one still has me stumped...

Sorry about that. Sketched it out based on how the board is laid out. For some reason it never really bothered me to have Vcc below COM. I guess I am strange that way.

I have simplified the circuit and made it more readable. I am still not sure what type of oscillator is used and am therefore unable to calculate it. I am unsure how the transformer will work into the circuit too. I have measured the transformer to be a 2:1 signal transformer instead of the...

Correction. That is not a 1:1 signal transformer. I am trying to figure out what it is now.

I am trying to rebuild a design and change the oscillator. Basically this product drives a non contact inductive sensor and measures the presence of metal near the sensor. I have drawn out the schematic, but am not completely understanding what type of oscillator design this uses. From what I...