I think I have the design ready. I am very happy with its performance and form-factor. I might continue tweaking it a little bit but it's necessary to declare any project ready to ship at some point. So it is.
Here is the list of features it has ended up with.
- Fixed 10MHz pulse train with fast rise and fall times.
- Rise time and fall time around 50ps
- Variable amplitude between 100mVpp and 1Vpp (via USB .) AC coupled.
- Trigger output ~1.5Vpp amplitude into 50R load. AC (default) or DC (solder jumper) coupled
- BNC jack for direct connection to oscilloscope input
- USB powered. Power requirement is 200mA at 5V. Can be powered from a USB charger.
I have about a dozen PCBs and can supply them starting from next week at £50 plus shipping for a fully assembled, tested and ready to go unit. This will barely cover my design costs and if this becomes a commercial product will probably be revised (up or down.)
As a bonus I will print out individual rise/fall time screenshots for each unit on my CSA 803A + SD-26 test setup for this run and supply them with the device.
It would be helpful if you indicate your interest by posting here so that I know how many units to assemble.
Thanks
Leo
P.S. I hope this is not considered heavily commercial for this forum. If you think it is please let me know.