My contribution to the increasing entropy, and eventual heat death of the universe
Archive for the ‘Uncategorized’ Category.
Updated the APC layout removing the headphone socket and making it look a bit nicer. Also increased the size of the holes for the pots which were too small in the previous design. Will go out to fab shortly.
Kicad files: APC2.tar
I’ve been playing with Gregory Charvat’s Can Radar design. While there are kits available, there doesn’t appear to be an open hardware layout. So I figured I’d have a go at putting one together. Below is the first rev. It uses the XR2206 which is no longer manufactured, but if you scratch around can still be found. Hopefully I’ll be able to get this version up and running then migrate the ramp generator to a different IC.
My layout:
My schematic:
Kicad files and gerbers: canradar.tar
Notes from Gregory’s presentation:
Thesis describing the Can Radar: http://hig.diva-portal.org/smash/get/diva2:762443/FULLTEXT02.pdf
I picked some of these Piezo stages up on eBay. They appear to be an OEM design with ~15 microns of travel and I believe a 150v drive voltage. They’re obviously designed for some kind of optics application.
Here’s a video of it in action with the covers removed. The calipers are set at 0.5mm. I’m using a 0 to 150v square wave to drive the Y axis at 4Hz.
Solidworks part: actuator_p915
The MDT690 is a 3 axis piezo. In simple terms it takes a 10V input and generates a 150V output to drive a piezo electric actuator. Diagrams below show the devices internals. The first two pictures show the
Upper Boards
Lower Board
Each channel uses two OP27s and an PA41. The signal from the offset pot and the BNC on the front panel are combined and head into the first OP27 which appears to be in an inverting configuration. This heads into a second OP27, I didn’t traceout the feedback on this but assume it’s a buffer for the PA41 and either it or the PA41 re-invert the signal. Comments welcome!
Marketing material for newer version: here
PA41 Datasheet: pa41_42U
Video:
My name is Nava Whiteford. I’ve worked for a few sequencing companies. I have equity in a few sequencing companies based on my previous employment (I try to be unbiased in my posts). You can contact me at: [email protected]
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