Not really, the Uptone has only one output but the worst part are the LDOs after the capacitors.
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Not really, the Uptone has only one output but the worst part are the LDOs after the batteries.
Thank you.
There's sprung terminals soldered through the board
Thanks Simon.
I have ordered cells with "U" tags. I guess I can cut them off (after I've run my output impedance tests).
@dvb projekt
You can not use the two 3.3V rails for the 6.6V output. So, you can parallel the rest two 6.6V rails together. In this case, 4 cells will be needed.
That's exactly what I'm looking for too 🙂 Have been following You or at time, and saw the projekt last Year.
If I only need the two 6,6V can I then leave the rest batteryholders empty ?
Is it with an integrated charger og is it bougt seperately ?
What's the price an how do I order ? Do You have an ongoing 2019 buy ?
That's exactly what I'm looking for too 🙂 Have been following You or at time, and saw the projekt last Year.
If I only need the two 6,6V can I then leave the rest batteryholders empty ?
Is it with an integrated charger og is it bougt seperately ?
What's the price an how do I order ? Do You have an ongoing 2019 buy ?
Yes, you can leave the rest of battery footprints empty if you don't need them. But you may need a couple of jumper wires at bottom side of PCB. Programmable battery charger is integrated on the PCB but you will need a external DC power. Standard 18.5V 3.5A laptop adapter would be good to go.
Regards,
Ian
Further to my post #399. I tested 3 pcs of 26650 A123 LiFePO4 cells in series.
The cells were brand new then ~95% charged/balanced before the tests. Experience with LiIon cells shows the the performance of the cells can improve after a few cycles.
I measured the output impedance at 44mOhms for the 3 cells, so approx 15mOhm per cell. The transient response is also rather better than the LiIon cells.
Conclusion: Very impressive performance!
The cells were brand new then ~95% charged/balanced before the tests. Experience with LiIon cells shows the the performance of the cells can improve after a few cycles.
I measured the output impedance at 44mOhms for the 3 cells, so approx 15mOhm per cell. The transient response is also rather better than the LiIon cells.
Conclusion: Very impressive performance!
Further to my post #399. I tested 3 pcs of 26650 A123 LiFePO4 cells in series.
The cells were brand new then ~95% charged/balanced before the tests. Experience with LiIon cells shows the the performance of the cells can improve after a few cycles.
I measured the output impedance at 44mOhms for the 3 cells, so approx 15mOhm per cell. The transient response is also rather better than the LiIon cells.
Conclusion: Very impressive performance!
Interesting Dave S, thanks for posting your findings - our ears don't deceive us on this one! Do you have the traces to compare to your other testing...I'm just interested?
Hi Crom,
Pic 1: 5mV/div 20uS/div
Pic 2: 10mV/div 2uS/div (close up of load-on waveform)
Pic 3: 5mV/div 2uS/div (close up of load-off waveform)
Battery voltage = 10.24V. Load resistor = 220R. Therefore the load switches between 0 and 45mA at 10KHz and deltaV = 2mV.
So ESR = 2/45 = 44.4mOhms (for 3 cells in series)
Pic 1: 5mV/div 20uS/div
Pic 2: 10mV/div 2uS/div (close up of load-on waveform)
Pic 3: 5mV/div 2uS/div (close up of load-off waveform)
Battery voltage = 10.24V. Load resistor = 220R. Therefore the load switches between 0 and 45mA at 10KHz and deltaV = 2mV.
So ESR = 2/45 = 44.4mOhms (for 3 cells in series)

Hi Ian,
I would supply some of your stuff with your new LIFEPO4 battery management board, so I would know what rails I need.
I have to supply:
1 x FIFOII
1 x Dual clock board (without oscillator, external clock)
1 x I2S to PCM converter
Can I supply all 3 boards with a single 3V3 rail? In this case, have I to remove any regulators from the boards?
Or I need 6V6?
I would supply some of your stuff with your new LIFEPO4 battery management board, so I would know what rails I need.
I have to supply:
1 x FIFOII
1 x Dual clock board (without oscillator, external clock)
1 x I2S to PCM converter
Can I supply all 3 boards with a single 3V3 rail? In this case, have I to remove any regulators from the boards?
Or I need 6V6?
Hi Ian,
I would supply some of your stuff with your new LIFEPO4 battery management board, so I would know what rails I need.
I have to supply:
1 x FIFOII
1 x Dual clock board (without oscillator, external clock)
1 x I2S to PCM converter
Can I supply all 3 boards with a single 3V3 rail? In this case, have I to remove any regulators from the boards?
Or I need 6V6?
Hi Ian,
you have P.M.
Andrea
Hi Ian
Is there any limit in the mAh of the LiFePO ?
(I have found some 3300 mAh.)
Further..
Is it possible to manual charge and stop charging ?
Is there any limit in the mAh of the LiFePO ?
(I have found some 3300 mAh.)
Further..
Is it possible to manual charge and stop charging ?
Hi Ian,
you have P.M.
Andrea
Hi Ian,
I need your help to place the order.
Thanks
Andrea
Maybe it has already been covered, but for the BUFFALO-IIISE PRO (ess 9038pro) no trident version, 3.3V and 1.2V are needed. 3.3V is available from the LiFePO4 battery power supply. Is 1.2 possible as well?
Not with the LifePo4 board alone, you either have to put an LDO to go from 3.3 to 1.2 or use the super capacitor board.
Thx Wealas. Do you mean the "old" super capacitor board from Ian, or the coming ultra capacitor power supply?
My understanding is that Ian had no time to work on the super capacitor supply so there won't be a new one any time soon. That is why he sent out his existing prototype boards out to other people.
Again, this is how I understood his comments, I could be completely wrong.
Again, this is how I understood his comments, I could be completely wrong.
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