I found this guy the other day looking for circuits on a tl494 he had a description on youtube that would work great for some of the projects we are building here.
Then I found the same guy has a pay site with all sorts of electronics lessons from making PC boards to building curve tracers, they are all two bucks each. This guys seems very solid and his explanations are in depth. Anyhow have a look his learning vids are only 2 bucks well worth it if one is stuck on something.
https://www.patreon.com/MrCarlsonsLab https://www.patreon.com/MrCarlsonsLab