Doing a search I found several references to whistle controller construction but the actual pictures and components would not show up. Does anyone have a link to this or have pictures of procedures and componets to construct a whistle controller to blow modern whistles and bells through my post war transformers. I know a series of diodes and switches is what’s needed but need diagram , specs and any instructions. I am sure it has been described on this forum but if the post is old some pictures have been lost or deleted. someone might can direct me without going to the trouble of reposting.
thanks
dogdoc