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Controlling the molechaser-buzzer with the ATtiny13A watchdog-timer. The average current consumption is now reduced from 4mA to 0.43mA.

By replacing the 555-timer with an ATtiny13A and a few Bytes of Software the average current consumption could be reduced from 4mA to 0.43mA. 
The Batteries are now > 1400 days running, compared with < 200days before. 
The buzzer is controlled by watchdog-timer and NMOSFET.