Hi. I was wondering if I could ask for some suggestions on voltage regulator (in a through hole package, not surface - too small for my fingers :slight_smile: ) I'm trying to minimise the current draw of an transmitter when idle. With help from this forum, I've now setup to sleep my Arduino Mini P…

What transmitter? Any reason you can't use 2-3 AAAs without a regulator?

Jiggy-Ninja: What transmitter? Any reason you can't use 2-3 AAAs without a regulator? I originally experimented with 3xAA batteries, but found the NRF wasn't transmitting. It seemed to need more "power". For running the step however, in theory 3xAAA and a 9V are close in size. Capacity is 1000 …

Don't forget that Alkaline cells have a significant voltage drop. They start at 1.5V-1.55V, but at the end of their life, the cell voltage is as low as 0.8V, so 3xAA in series will give 4.5V in the beginning, but expect to get something around 2.4V from the same 3 cells at the end of their life. Ref…

The nRF24L01+ has an absolute maximum supply voltage rating of 3.6V. If the modules didn't have a regulator on it, a 3 cell alkaline battery will exceed that easily. There's basically no way a 9V PP3 will have higher current capacity than comparable AA or AAA cells. Some of them are actually made w…

HC7333 with similar ratings as your last one?

musskopf: ...all regulators you've listed are LDOs, which basically "burns" the extra voltage, converting it to heat. If you're after better efficiency, have a look on switching regulators... I did try a switching regulator similar to the "Pololu 3.3V, 500mA Step-Down Voltage Regulator D24V5F3".…

That is because I messed up the model. It is HT7333 http://www.angeladvance.com/HT73xx.pdf Moderator edit: Language.

cjcj: I did try a switching regulator similar to the "Pololu 3.3V, 500mA Step-Down Voltage Regulator D24V5F3". During non use, it drew 210uA. In comparison, the best regulator I've found to date draws 2uA. Given my transmitter will sleep each time after a key press, it will be off more than it's o…

You need to check the regulators data sheets more carefully. A lot of low current low drop out regulators have a very low maximum input voltage. At least one of the regulators you quoted could be fried if you connect it to a 9V battery.

Voltage regulator supplying 3.3V with lowest quiescent current suggestions

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MarkT October 25, 2016, 2:06pm 3

~10uA is fine, most 9V batteries probably self-discharge at a higher rate than that.

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Voltage regulator supplying 3.3V with lowest quiescent current suggestions

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