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Look at the bottom circuit:
When the EC Pulse Source turns off its voltage, it is not like turning off an ordinary SPST light switch.
Instead, it is switched internally to zero. (if 0v is in the min setting).
There is a major difference between those two different actions:
The action of switching from high volts to zero can be seen here in the top circuit with the relay.
That is how the E. C. pulse source works.
By this switching to zero, a circuit line is maintained. The line is not simply broken.
Wheras an ordinary SPST switch would simply break off that line when open.
By keeping the line down to zero from the R C network seen on the right, the capacitor is allowed to immediately discharge to earth (the zero battery here is only to serve as a reminder of the zero earth within the EC pulse source ... Remove the zero battery and just make the earth connection there if it helps clarity).
Now open the switch on the lower circuit ... to simulate an ordinary SPST action instead of the above.
See how the voltage there stays constant at whatever volts it was at when you opened the switch.
That is due to the capacitor being charged up to that point, with no discharge happening.
So ... Bear in mind that whenever you use the EC pulse source, there will be a return path line happening, and not a switch-like line break.
With all the above in mind, we could then create a timed switch to replace the bottom SPST switch there ...
and so obtain a Volts output of our choice at any required point during the cap charge process... and that pre-determined output could trigger whatever we wish (such as a Mosfet or further relay etc).
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