New ramp generator

It has been a long time. The project was on hold for a while.

I have had it with the analog board. It is hard to align. It just contains too much trimmers. It is old fashioned too.
So I will use a different concept for the sweep. The DAC will generate 10 different voltages in 50mS. The voltages will depend on the range and the offset frequency.
This signal will be filtered by low pass filters. This signal can be used as sweep signal.

For the X axis on the scope the DAC will also generate 10 voltages. This signal will be be filtered by a low-pass filter too. Those filters will be made identical.

The concept has been tested using a different micro-controller board. It looks promising.