Search found 4 matches

by carlos
Mon Dec 31, 2018 7:31 pm
Forum: DSO Shell
Topic: Li-ion power mod
Replies: 144
Views: 185036

Re: Li-ion power mod

It is unpredictable and it will vary from unit to unit. Basically at around 7.5V, which could actually be 7.5V ±0.5V the +5V and the -5V regulators will stop regulating and then anything is possible. The problem is that at that point the scope will NOT just die but will stop functioning properly an...
by carlos
Tue Dec 25, 2018 9:00 pm
Forum: DSO Shell
Topic: Li-ion power mod
Replies: 144
Views: 185036

Re: Li-ion power mod

You are right that the undervoltage protection kicks in only well under 7.5V. I wasn't aware that the scope isn't functioning reliably below that, thank you for the warning! (Thanking also for those who might otherwise follow me in making this mistake.) I will definitely watch out for wrong readings...
by carlos
Mon Dec 24, 2018 7:04 pm
Forum: DSO Shell
Topic: Li-ion power mod
Replies: 144
Views: 185036

Re: Li-ion power mod

IMG_3971.JPG The side rim of the digital PCB had to be trimmed a little to make enough room for the hard paper backplate of the charge indicator. IMG_3959.JPG Detail of the rotary encoder PCB. To make sufficient room for the thickness of the cells, I trimmed the solder points as flat as I could and...
by carlos
Mon Dec 24, 2018 7:03 pm
Forum: DSO Shell
Topic: Li-ion power mod
Replies: 144
Views: 185036

Re: Li-ion power mod

In this and the following post (too many images for one) I would like to share my DSO150 battery mod using two lithium cells (without a voltage regulator), one module for battery protection, one for charging and one charge level indicator module. I haven't used the device heavily since I made the mo...