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Open Source Hardware

4 Posts authored by: michaelkellett Top Member
I had hoped to to have completed the basic design by now but I've spent a lot of today thinking about power supplies, but not getting quite far enough to commit to paper (or CAD). The idea was always to have a a separate power conversion board, so there is no reason that the rest of the design can't be offered up for discussion without the psus.   All the schematics will be posted as .pdf s but it's probably easier to have the blurry .jpgs in this blog for instant reference.   I' ...
15/08/2020 This is still very much work in progress.   I've confirmed my primary choice of display, the Riverdi RVT43ALBFWN00, available from Mouser and RS. It has an SPI interface over a 20 way FPC and uses a Bridgetek controller chip. This is fairly smart and reasonably well documented chip and very much mitigates the slowness of controlling a hi res display over SPI. It costs about £27.   Here's a picture - of the important side !     The plan is that the disp ...
Overview   Once again there are few (if any) component vlaues on the schematic, these will appear in the BOM later on. Treat the pin numbering on the FPFA with caution, I shall swap pins as appropriate when I layout the board.     The Details   The DAC digital interface is forced to SPI mode by pulling pin SPI2C low. The FPGA drives it s three SPI signals (the DAC can't return any data to the FPGA. The analogue signal from the DAC is low pass filtered by the Sallen an ...
This is my first stab at the input amplifier for the Archaeology Resistance Meter Project. It's tagged as armp   Overview The schematic has (almost) no component values but I shall talk about them in the text. All two terminal components are in 0603 packages unless marked otherwise.   A better print of the schematic is uploaded as a .pdf in Open Source Hardware   The original plan was that the maximum possible (working) input voltage would be +/- 15V but comments from dav ...

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