Just kind of thinking about something...
Would it be fairly easy to build a circuit that switches between battery power and line power when line voltage anomalies are detected? Like a UPS, but for a 9-volt wall-wart and battery?
Getting more complicated I'm sure, but I was also thinking of putting a 9-volt rechargable battery as the "ups", and have it recharge when not in use and under normal line voltage.
Would the recharging process change the voltage? So once the line comes back to normal and input power is switched back to it, the charging process will throw it back out of whack until it's recharged (creating a catch22).
Here's the background:
I have wireless security cameras around my house and they recently started frequency-drifting sporadically. I *think* I've traced it down to our air conditioners (and the rest of the neighborhoods a/c's) changing the incoming line voltage, causing the camera power to change slightly, resulting in slight frequency shift. They're cheap little cameras, so input power affects frequency. The shift is just enough to cause annoying lines on the screen, which fools the software into thinking it's motion and constantly recording...
Would it be fairly easy to build a circuit that switches between battery power and line power when line voltage anomalies are detected? Like a UPS, but for a 9-volt wall-wart and battery?
Getting more complicated I'm sure, but I was also thinking of putting a 9-volt rechargable battery as the "ups", and have it recharge when not in use and under normal line voltage.
Would the recharging process change the voltage? So once the line comes back to normal and input power is switched back to it, the charging process will throw it back out of whack until it's recharged (creating a catch22).
Here's the background:
I have wireless security cameras around my house and they recently started frequency-drifting sporadically. I *think* I've traced it down to our air conditioners (and the rest of the neighborhoods a/c's) changing the incoming line voltage, causing the camera power to change slightly, resulting in slight frequency shift. They're cheap little cameras, so input power affects frequency. The shift is just enough to cause annoying lines on the screen, which fools the software into thinking it's motion and constantly recording...