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Low-Battery Indicator

for 9 V Batteries

Low-Battery Indicator
For many years now I have been using the electret microphone amplifier described in Elektor Magazine in the distant past as part of my loudspeaker measurement system. It uses a 9-V battery as a power source. So that I don’t need to guess the state of charge of the battery for reproducibility of test results, I have retro-fitted the amplifier circuit with a low-battery indicator.
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