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Fr: retardateur d'alimentation 2 - sortie à 2 états
Like the "power supply delay 1 - analogic output", it has the same fonction, but the out voltage does not vary, and allows to use more energy.
1) switch on the system
2) switch off the system
3) set the resistor for set the add time
Values in this circuit is E48 serie or more.
This is a scheme of principle with real values... but in practice you need to put protections depending on what you done.
Then go see my circuits "...protection..."
NB: Because the transistor is no longer part of the output circuit, the led (my fan) recieives more energy, and we must add a resistor to find the same current than in the previous power delay.
Be carrefull, if you use this circuit with less than 6V, most of the small voltage relays need average 3V, and the transistor little more than 2V.
If u are in this situation, you should use a particular transistor >> HEMT (3-5) which provide to be lower voltage controlled.
Or u can design another command circuit. (ie: add a step-up boost stage circuit)
PS: i have trouble with setting in transistor simulation to correspond to reality of HEMT technology. I work on.
when this trouble will be solved, i will publish the 3rd and last power supply delay
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