analog board

As explained before, the analog board scales the sweep signal and adds the offset voltage(for center frequency). See the picture in my previous post.

In order to be able to use 5V control signal I had to replace the 4016 IC's. Now I use 74HCT4066 chips. They are pin compatible.

The board works. I have one concern though. I had to add A DC component to the sweep signal. This was done in order to keep the voltages over the 4016 switches in range. A high pass filter removes that DC voltage. So far so good. However, while switching between ranges (MHz/div) it may take a few seconds for the filter to go to the new steady state. This will cause some unwanted visual effects.