Questions for building Buck/Boost

[Dougiestyle]

My GF's son is almost graduated as an EE. He seems willing to help me with modding (i.e. building circuits). I need to provide him specs for input and output to give him a baseline to build me a circuit. I use DC cartos, so 6A? How many Watts? I'll only want up to ~6.5v and input is the magic 3.7v lol.

What, if any, other specs should I ask for?

 

[Rocketman]

Give him one of your ecigs, and a DC carto.
Tell him this is what I do now,
This is where I want to go.
As a grauated EE he should be able to develop a specification.
It would be good practical experience for him.

Where did you hear the "6Amps" and Why "6.5 volts"?

 

[Eddie.Willers]

Interesting proposition.

Why not give him the input voltage (a 3.7v battery is over 4 volts when hot off the charger), the resistances of the attys/cartos you would like to use (1.5, 1.7, 2.0, 2.5, 3 ohms etc) and allow him to calculate the wattage range and resulting current.
Bear in mind that higher wattages run the risk of burning the juice and/or heating the atty coil too fast to result in useable lifespan.

 

[Rocketman]

To properly "Design" a Variable Voltage circuit you would need to know the full charge unloaded voltage (to not damage the circuit), the full charge loaded voltage of the cell (initial loaded voltage varies with load resistance and cell internal resistance), the lowest loaded cell voltage (to not damage cell). These parameters would be necessary to "Design" a voltage/current transfer function that took the cell input and transform it into a usable and efficient output to vape from.

If you know these values, give them to him. If not let him test and measure, then design to the test results.
Or, copy something someone else has done. But that's not engineering.

Rocket

 

[Dougiestyle]

Thanks for the replies! I'll pass the info on to him with some excess equipment I have so he can test and build!