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JYE Tech Forum • View topic - Li-ion power mod

Li-ion power mod

Re: Li-ion power mod

Postby aiyiadam » Thu Dec 27, 2018 4:46 pm

Lots of great ideas here. Maybe this could be simpler and faster solution for those like me, who aren't that skilled.

For DSO Shell I had bought a cheapish step-up USB cable (Unnlink brand) and was using it with a powerbank. Since the cable is too bulky and there is enough space in the DSO Shell, I have decided to put the circuit board in the device. Soldered a mini USB connector and a 100uF capacitor for getting rid of some ripple (As advised somewhere in this forum). And for attaching the DSO Shell to the 5000mAh powerbank I have used some velcro.

Later I could make a shorter cable and build a stand for the powerbank, but probably those won't be necessary.
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Re: Li-ion power mod

Postby upsss » Thu Dec 27, 2018 7:02 pm

@aiyiadam, Good idea if you can live with an external power bank (everyone has one) and can install a small step up module inside the scope. Instead of using a 9V Step-Up USB cable, taking it apart and soldering a mini USB connector, all you need is this $0.75 module .
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Last edited by upsss on Fri Dec 28, 2018 6:00 am, edited 2 times in total.
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Re: Li-ion power mod

Postby aiyiadam » Thu Dec 27, 2018 7:37 pm

@upsss Thanks for the tip. If I didn't have the step-up cable, I would definetly prefer to use a step-up module like that.
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Re: Li-ion power mod

Postby carlos » Mon Dec 31, 2018 7:31 pm

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Re: Li-ion power mod

Postby MorganFlint » Mon Jan 21, 2019 5:20 pm

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Re: Li-ion power mod

Postby upsss » Tue Jan 22, 2019 5:21 am

@MorganFlint, eliminating the ±5V regulators and powering everything from 5V is probably OK. However, powering it directly from a single lithium cell it is a bad idea. That kit doesn't have a battery charger circuit and no low battery voltage indicator. The battery voltage could be all over the place and the 3.3V regulator may drop out of regulation without any warning. The 3.3V regulator BL8060-3.3 wort case condition, +2% tolerance + 210mV minimum dropout voltage the regulator will drop out of regulation at battery voltage of <3.6V (plenty capacity still left) and again, you can expect unpredictable performance of the scope!
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Re: Li-ion power mod

Postby MorganFlint » Thu Jan 24, 2019 9:25 pm

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Re: Li-ion power mod

Postby upsss » Sat Jan 26, 2019 4:44 pm

I wouldn't use their JYE118, it doesn't solve any of their problems. If anything, I would use a USB 18650 power bank which has a built in charger and a step up converter to 5V. You can find these power banks with a battery cheaper than their JYE118. This way you have a constant 5V output, a built in USB charger with battery protection, low battery shut down and a large battery capacity.
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Re: Li-ion power mod

Postby MorganFlint » Tue Jun 04, 2019 4:05 pm

Although this thread is almost dead, for the sake of completeness, in you can find the instructions about how DSO138mini implements battery power.
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Re: Li-ion power mod

Postby Leonardolb » Thu Sep 12, 2019 8:59 pm

Here's my mod.

I used:
1x MT3608 DC-DC Step Up Converter Booster Power Module
1x TP 4056 Micro USB 1A Lithium Battery Charger With Protection Module
1x (7 years old) Nokia Cellphone Li-ion Battery, 3,7V 1020 mAh

I do noticed some noise, but since we don't have other simple option (which won't involve main PCB rework), I think I can live with that :lol:
I tested the system and it worked for 3 hours until the battery reach the minimun safe voltage, but the board always received continuously 9V, only jumping the noise from 6kHz to almost 10kHz at the end.

Running Open DSO Shell 3.1 firmware.

And yes, I know that my device is a counterfeit one, tryied to argue with my local supplier but had no success, so I have to deal with what I have :oops:

20190911_101507_resized.jpg
Testing

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Mounting

20190912_173551_resized.jpg
Built

20190912_173647_resized.jpg
USB Charging Port

20190912_173721_resized.jpg
Charging (note the red light through the hole)
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