l have built this throttle. http://www.awrr.com/throtl8.html. I like the operation and the designer answered my emails when I had trouble with it. One thing I would add is a circuit breaker on the output of Q2. I have blown a few Q2's with a short.
pe700, that's the one I'm thinking of building. What amperage breaker would you use, just shy of the max. output of the throttle? I'm glad to see the designer is available, there's nothing like getting info straight from the source. Did you have any trouble sourcing the parts?
Sheldon, I'm going to have to take a look at Aristo-Craft's site. At some point in the future I may, as you indicated, desire to use a radio throttle and I've heard their name for a long time.
Thanks
Lou, just so you know, because they are very large scale focused, Aristo Craft's product info does not explain much about using the Train Engineer in HO.
So, please feel fee to ask on here, or send me a PM if you have questions they don't seem to answer.
Sheldon