That is very interesting Stan. I just happen to have a couple of those DCSRC devices left over from a couple of MTH sets. I might have to make use of them with your neat project here. Thanks for "staying on the case" and posting the results.
And... thanks to one of your previous posts I might even have the 74HC14, in addition to all the other parts. That part sounds familiar, no doubt from one of you and GRJ's other electronics threads (which, after reading, I secretly order parts from).