Hello everyone!
Before diving into my question, perhaps I should provide some back story.
I am just finishing a college degree in avionics at a specialized school nearby and love tinkering with electronics. I have a small home lab complete with oscilloscope, power supply, frequency generator and anything else I could need (although I seem to keep on buying stuff). I even built my own CNC to route double-sided PCBs and a 3d printer to, well, do "stuff" with.
So last christmas my mom asked for a theremin. "WTF is a theremin?" I asked myself. How I would describe it: A box used to make star wars sound effects.
Now for the questions!
I designed, routed, soldered and got (mostly) working a PCB based on the EM Theremin PDF. Not the "hot rodding" one. Some mistakes were made, some traces missing... Nothing a quick jumper cant fix. All in all, it seems to be quite solid. I got the variable pitch oscillator AND the fixed pitch oscillator working and I can get some (faint) sound on a low power speaker from the detector. HOORAY!! My (first) problem is that the volume oscillator just. won't. work. period. I'll provide a schematic with my measurements down lower. I've observed all the correct measurements around the associated transistors and verified that the resistors are all correct. I've even changed out a few caps just to make sure I hadn't killed them when soldering.
I should also mention that I was unable to find the coil specified in the BOM, but I did order one from coilcraft. The SLOT TEN-5-11 (link) style 5. Also, The shield can is NOT touching a ground plane. I tried grounding it but it made no difference... I didn't expect it to either...
So what I see from the output of the volume oscillator is basically coupling from the variable pitch oscillator. But the noise is in the order of 10mV, nowhere near the 10V i'm SUPPOSED to be getting. I confirmed this because the 2 are in phase, perfectly.
If you guys need more info, scope snaps, measurements, pictures of the board... ANYTHING. please let me know. I also have available to me a huge lab with millions of dollars of equipment, nothing is impossible for me (until I finish school hehe) so please don't hold out for simplicity's sake.