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,
you have P.M.
Andrea
Hi Ian,
I need your help to place the order.
Thanks
Andrea
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