I put in a Ni200 coil on a DNA75C, it read 0.188Ω. I let it cool down and it asked new (0.178Ω) or old (0.188Ω). I'm perfectly fine with this. It is just asking whether to accept refinement or not, instead of accepting automatically like on non-C boards.
I put in a Ni200 coil on a DNA75C, it read 0.188Ω. I let it cool down and it asked new (0.178Ω) or old (0.188Ω). I'm perfectly fine with this. It is just asking whether to accept refinement or not, instead of accepting automatically like on non-C boards.
Question about the DNA250 & 250c.
Datasheets show that minimum input voltage is 9 volts and max 12.6 volts. But I see 2x18650/21700 DNA250 mods so even at full charge can only supply a max of 8.4v input to the board.
So how do these 2x18650/21700 DNA250 mods supply sufficient voltage to the DNA250? Are they using some kind of boost converter to increase the input voltage to supplied to the DNA250?
Datasheets show that minimum input voltage is 9 volts and max 12.6 volts. But I see 2x18650/21700 DNA250 mods so even at full charge can only supply a max of 8.4v input to the board.
So how do these 2x18650/21700 DNA250 mods supply sufficient voltage to the DNA250? Are they using some kind of boost converter to increase the input voltage to supplied to the DNA250?
a 2 cell 200 can put out 6 volts.
A 2 cell 250 can put out 6.3 volts.
A 250C the figure has not been published but it is close to the 250.
Keep in mind since these are buck circuits they will never output higher than battery voltage under load,
I hope this helps answer your question.
Oh, the components will operate at that lower voltage to operate the board.
A 2 cell 250 can put out 6.3 volts.
A 250C the figure has not been published but it is close to the 250.
Keep in mind since these are buck circuits they will never output higher than battery voltage under load,
I hope this helps answer your question.
Oh, the components will operate at that lower voltage to operate the board.
Thanks for the reply but I am inquiring about the input voltage to (operating voltage of) of the DNA250, not the DNA250's output voltage nor the board's buck/boost capabilities.
If you look at the datasheet for the DNA250 or 250C you'll see that it requires a minimum input voltage (aka operating voltage) of 9 volts, which cannot be supplied by 2x18650 or 2x21700 batts (they can only supply 8.4v and less). So the only way I can think of for these 2x18650/21700 mods to be able to supply enough input/operating voltage to the DNA250 board is to have an additional board inside the mod (like a boost converter board) that boosts the input voltage within the 9v-12.6v range that the DNA250 requires. I was hoping someone here could tell me how exactly they are achieving the minimum 9v input requirement with only two 4.2v (or less) batteries. They would need at least 3x 18650/21700 batts to be within the DNA250 board's input voltage requirements.
The data sheet is for a 3 cell configuration. They probably should have published a data sheet for a 2 cell configuration. With the 2 cell configuration the board operates with 5.5 - 8.4 volts. There is no boost involved.
Here's a screen capture of the 250C battery configuration from the 250C I just built. As you can see it is configurable for a 2S battery configuration. The one I built is a 3S. I couldn't get the case I wanted to build a 4S so I compromised with a 3S, 1500mah, in a smaller case. I hardly ever get over 35 watts so it's not all that important to me to have all that power available.
5 hours later after sitting, it refined again down to 0.165Ω. Every time I swap out a battery, it asks new or old coil.
Non-color boards, I have trouble with swapping batteries. Often it will automatically accept a hot coil as the new cold resistance without asking. The workaround I learned was to lock the resistance at least 4 to 6 hours before the battery swap. Thus that will keep the cold resistance in place after a battery swap. Although you lose refinement if you lock the resistance. Anybody know of a better way?
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