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Supply voltage requirement?

mike miniver All Messages By This Member #4030 Is there an on-board voltage regulator that converts 5.0V from the USB to whatever is used internally? If so, what external voltage range could be used in lieu of 5.0V from USB (but through the USB connector) to power the nanoVna? I'm thinking of 4 rechargeable NiMH cells which would be about 5.2V fully charged, and about 4.4V when they need to be recharged? WA7ARK
Larry Rothman All Messages By This Member #4031 Mike - Don't use anything else! The NanoVNA was designed to use only a 5V supply, via the USB port. The internal charge IC is both a 3.7V LiIon charger and 5V inverter combo - there are lots of comments about that chip on the forum. The 5V output from that inverter MUST be well regulated as it supplies the mixer (612) chips. If you want? longer run time - get a bigger Lithium battery. Do NOT use anything else or you'll damage stuff. I used one from a cellphone that was 1100mAH - it WILL charge - but will take longer. toggle quoted message Show quoted text On Friday, October 4, 2019, 2:30:19 p.m. GMT-4, mike miniver <wa7ark@...> wrote: Is there an on-board voltage regulator that converts 5.0V from the USB to whatever is used internally? If so, what external voltage range could be used in lieu of 5.0V from USB (but through the USB connector) to power the nanoVna? I'm thinking of 4 rechargeable NiMH cells which would be about 5.2V fully charged, and about 4.4V when they need to be recharged? WA7ARK
Bob Albert #4041 How much run time should I expect from the standard battery? toggle quoted message Show quoted text On Friday, October 4, 2019, 11:46:33 AM PDT, Larry Rothman <nlroth@...> wrote: Mike - Don't use anything else! The NanoVNA was designed to use only a 5V supply, via the USB port. The internal charge IC is both a 3.7V LiIon charger and 5V inverter combo - there are lots of comments about that chip on the forum. The 5V output from that inverter MUST be well regulated as it supplies the mixer (612) chips. If you want? longer run time - get a bigger Lithium battery. Do NOT use anything else or you'll damage stuff. I used one from a cellphone that was 1100mAH - it WILL charge - but will take longer. ? ? On Friday, October 4, 2019, 2:30:19 p.m. GMT-4, mike miniver <wa7ark@...> wrote: Is there an on-board voltage regulator that converts 5.0V from the USB to whatever is used internally? If so, what external voltage range could be used in lieu of 5.0V from USB (but through the USB connector) to power the nanoVna? I'm thinking of 4 rechargeable NiMH cells which would be about 5.2V fully charged, and about 4.4V when they need to be recharged? WA7ARK
Larry Rothman All Messages By This Member #4044 I think folks here are reporting 2-4 hours depending on the size and age of battery.I hear units come with 300mAH up to 450mAH batteries.? YMMV toggle quoted message Show quoted text On Friday, October 4, 2019, 3:09:04 p.m. GMT-4, Bob Albert via Groups.Io <bob91343@...> wrote: How much run time should I expect from the standard battery? ? ? On Friday, October 4, 2019, 11:46:33 AM PDT, Larry Rothman <nlroth@...> wrote: ? Mike - Don't use anything else! The NanoVNA was designed to use only a 5V supply, via the USB port. The internal charge IC is both a 3.7V LiIon charger and 5V inverter combo - there are lots of comments about that chip on the forum. The 5V output from that inverter MUST be well regulated as it supplies the mixer (612) chips. If you want? longer run time - get a bigger Lithium battery. Do NOT use anything else or you'll damage stuff. I used one from a cellphone that was 1100mAH - it WILL charge - but will take longer. ? ? On Friday, October 4, 2019, 2:30:19 p.m. GMT-4, mike miniver <wa7ark@...> wrote: Is there an on-board voltage regulator that converts 5.0V from the USB to whatever is used internally? If so, what external voltage range could be used in lieu of 5.0V from USB (but through the USB connector) to power the nanoVna? I'm thinking of 4 rechargeable NiMH cells which would be about 5.2V fully charged, and about 4.4V when they need to be recharged? WA7ARK
mike miniver All Messages By This Member #4052 The internal LiOn battery (if connected) is like 3.7 to 4.2V. It is normally charged from externally-supplied USB 5V. This suggests to me that the innards run on something less than 3.7V (most likely 3.3V), meaning that there is an on-board voltage regulator to drop 5V to whatever the internals run on. My question has to do with what is the maximum voltage that the internal voltage regulator can handle. If doing this, there would be no internal LiOn battery.
DMR #4059 Edited Need to place the file with the electrical circuit separately. Some do not suspect that it is in the instruction manual. Many questions will disappear. NanoVNA Schematic.pdf NanoVNA Schematic.pdf
Oristo All Messages By This Member #4061 Need to place the file with the electrical circuit separately. added to Wiki Main Menu: /g/nanovna-users/wiki
Larry Rothman All Messages By This Member #4070 Mike,Look at the schematic at the end of the July user guide.?The 5v output from the inverter powers the 612 mixers and also feeds an LDO 3v regulator that powers everything else.? On Fri, 4 Oct 2019 at 4:30 PM, mike miniver<wa7ark@...> wrote: The internal LiOn battery (if connected) is like 3.7 to 4.2V. It is normally charged from externally-supplied USB 5V. This suggests to me that the innards run on something less than 3.7V (most likely 3.3V), meaning that there is an on-board voltage regulator to drop 5V to whatever the internals run on. My question has to do with what is the maximum voltage that the internal voltage regulator can handle. If doing this, there would be no internal LiOn battery.
mike miniver All Messages By This Member #4126 On Fri, Oct 4, 2019 at 03:47 PM, Larry Rothman wrote: Mike,Look at the schematic at the end of the July user guide.?The 5v output from the inverter powers the 612 mixers and also feeds an LDO 3v regulator that powers everything else. I see that now... I will cobble up an external LDO regulator to make 5.0V from the big external SLA 6V battery.

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