I need to redo sensor board as I've glued a tiny pcb piece to the sensor board which now I cannot remove. I guess I will have to create the board again. This is really annoying! 

Although it highly annoying I thought I might improve my design. Now I have to solder Quartz Fork each time I want to check something. The thin connectors are already done, after much soldering. 

Now, I found a wat to fix it. I will use USB socket. this way I can connect different forks without need to re-solder the board. 

It's a win-win situation since every quartz fork I've made needed some kind of PCB to hold it. It's imposible to hold quartz fork with tweezers.

First schematic with USB quartz fork holder.

Got USB connectors, stay tuned 😄 

This is the idea, 

(I know the connector is upsidedown, it's just a preview). The tiny PCB's thickness is standard  and it site quite solidly in it's place. Definitely a nice lemonade solving such big problem in such simple way.

Now we can test different ideas for quartz fork and see how they respond without resoldering (and breaking main board).

I've tried to print this PCB at home with laser (it gives much better results than CNC-mill). But for some reason it always under etched or overetched.

I gave up and ordered PCB from China. This time paid extra 10$ for fast shipping.  One day after ordering and it didn't even started yet. 

Although it's annoying to wait those boards are have all the fixes I had to do in the previous version. This is important since at some point we want to make it PCBA, which means people who wants to build AFM, could order not only PCBs but all the components assembled. 

Got the PCBs let's get started...

Ok, found some time to solder first part, the attenuator. 

I thought it would be a good idea to check. Got 40mV bit noise but as expected. (For some reason I thought it should be 400mV)

More components added, 

Tested looks good once in right frequency the output is quite high 

Added all components including usb port that will be used to hold the probe. 

And that's how it connected to the frame

Added new frame v3:

With smaller plastic that holds the screws, I got better movement range of coarse mechanical mover.

Now it's time to make all kinds of probes and see which one is the best for us.