Wild_Bill wrote:

Besides a variac for universal motor variable speed, the inexpensive
triac/diac-type Router Speed Control units sold by HF and others (maybe $12
on sale) might be a good alternative.
IIRC, the user manual states that the speed control units are for series
field windings, but I haven't read it recently.


In that case, you can use a light dimmer.


--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.