In SX Microcontrollers, SX/B Compiler and SX-Key Tool, originator99 wrote:

For longest possible battery using a 9volt non rechargable and an SX28, would you recommend a 7805, or 5v Zener, or somke other method to conserve the battery?  If possible, I was planning to put the SX to sleep unless one of two buttons are pressed.  The SX sends a byte out via the Parallax 433mhz transmitter, and there's not much else in the box.  I was hoping to hoping to get at least three months out of it as the buttons will hardly get used, maybe ten times a day if that.  I felt like the killer would be the 7805.

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