Precision Programmable Power Supply

Latest rendering of the 3D model (Autodesk Fusion 360)

This separate page contains form of a log of my current project. Although it's at the final stage it remains work in progress. At the beginning I didn't think about capturing the progress and making it public. Hence some parts of the story can be missing. At the time of this writing the current state of the supply is operational. The frame and main board are complete. The logic is in prototype form but is functional. Most of the firmware is working. Up to this point I'll be writing and posting retrospectively. Most of the material is ready but needs to be transferred here.
_________________
Long time ago I started building a bench power supply for my hobbyist needs. Back then (’90s) it was quite difficult to find a well designed schematics of such device. I used one I found in an electronic magazine but that was more of a conceptual than finished design. Despite this it seemed to work well and was able to provide 0-30V and 0-10A of current. I managed to design a TTL controller for it myself, so that the supply was controlled by buttons, not by knobs.
The idea was simple. Using a DACs to provide reference voltages to the supply circuit. The DACs I used were simple 8bit DAC0808 with parallel input. To provide the input I used binary counters to which I would feed a clock signal via UP and DOWN buttons. There were two frequencies/speeds to achieve fast and accurate settings. The reading were presented on analog panel meters.

Although it was working fine (powerful enough to charge car battery for several hours) I never managed to finish it completely. Initially I wanted to supplement it with multiple standard voltages output channels, some LED indicators and a digital volt meter.
More is comming soon...
Short update: There has been quite drastic change to the front panel and the work is nearing the GRAND FINALE. As soon as it's all complete I'll be posting all the details.
2017-01-31
Long time no see. The concept of the front panel has changed completely. Please see the first video on the main page. Now it's all LCD with soft buttons. I hate them but must admit - it's easy to create (nearly) any interface you want.
The electronics is completed. The last task left is to finalise the firmware. I have a set of functions in mind and now it's down to implementation - and time! Of course - the time….