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Re: Tinytrak power supply low voltage from a single LiPo cell?


 

Eric,

We use ( And include) a 3.7 Volt LiPo battery with our Micro-Fox 15s transmitter, which is essentially a TT3 at heart. Your TT3 has a linear 5 Volt regulator, so you will need to bypass it to provide power the the PIC, and your LED's will be a bit less bright. I suggest turning them off.? If you plan to feed a GPS from the?+5 ( or?+3.7) line on the DB-9 connector, the lower voltage serial output on your 3.3 Volt GPS may ( Or may not)? be too low to drive the TT3's serial input, so you may also have to bypass the serial input?resistor of the TT3. Don't cut it out...you will need it again when you connect your TT3 to a computer's serial port for programming.?

Since the Zombie Apocalypse?(The CHICOM-V ) I have been having a new found love affair with rechargeable LiPO batteries. Using 3 X 18650 batteries of doubtful parentage, I have been running new test prototypes of our MT-AIO, and their low ESR and lightweight are incredible, at least compared to AA batteries. Three of these 18650's can run an AIO for three days at 12 to 10 Watts output power, and then just stop...no decay to speak of, they just turn off. This is probably not exciting to many people, but I am sure that some of you have seen battery hysteresis using the TT3 and cheap alkaline batteries, so it make me very happy! Is it wrong for a man to love a battery? Even in California?

73,

Allen AF6OF
VHS/Byonics

On Thu, Apr 30, 2020 at 12:17 PM Eric Oberg <ericoberg1@...> wrote:
Hi All,

The datasheet for the Microchip PIC16F628 (used on my Tinytrak 3) says it can run from 3.0 to 5.5 V. The PIC16F1827 (used on my Tinytrak 3+) is 1.8 to 5.5 V. Looking to run from a single Lipo battery for weight and volume constraints. Lipo (lithium ion polymer) run from 4.2 volts when full to 3.7 when discharged. Anybody have any experience running at 3.7 to 4.2 volts?

Thanks,
Eric

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