I now have the production version of the timer working well. I have built up 5 units and 5 more are being built by an outside source.
In actual tests, the motor run maximum is 22-23 seconds and the maximum DT time is 221 seconds. Minimum time for both is 1 second.
The PCB is just over 3/4 inch square and weight for the system, as shown above, is 2.54 grams.
Next I will build the E20 model and do some flight tests on the unit.