Building a pulsator
For many years I've fool around trying and building different designs of pulsators. My original thoughts tried to control the max and min vac by regulating the speed and time of the pump. This just doesn't work.
I've bought several rechargeable ones with different setting. These still leave much to be desired.
My newest design that I think is a hit, uses an adjustable vac pump controlled by speed, that is on all the time. I then have a vacuum solenoid valve (12 volt) that switches between two adjustable relief valves. One being min vac (adjustable) the other being max vac (adjustable).
I then use this to control the timing for the valve.
https://www.amazon.com/dp/B07QVZMGNC?th=1
Add a vac gauge, master switch, bypass switch, and 12v power supply and I've finally got what I want.
By the way, I find the switch above (only in 110 volt) really handy for many applications. I have a 110 volt one that I made with a male and female plug. I use it to regulate the timing on varies tools.
If anyone is looking for more info. Leave a comment and I can do a build sheet with some pictures.