Hi there, A followup to this mail from a couple months ago. I started with your USBtinyISP design and ended up with this. It’s not recognizably based on your circuit anymore, and it has a few more big features (dual power supply, JTAG programming, USB-TTL serial, rescue clock). But a little bit of the USBtiny’s soul is still
there! You can follow along with the development on my blog: http://www.sowbug.com/
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[Disclosure: I laid out that board.]
Although this is a really capable little programmer, my favorite feature is a really low-tech one: The silkscreen on the back, with the map of the six pin ISP header. For some reason, I always end up needing to know the pinout at an inopportune moment, and that saves me a trip back to my computer.