Showing posts with label Water Activated Alarm Circuit. Show all posts Showing posts with label Water Activated Alarm Circuit. Show all posts Home » Posts filed under Water Activated Alarm Circuit Water Activated Alarm Circuit sangdesains 02:40 Belum ada komentar This Water Activated Alarm circuit uses a NE555 timer wired as an astable oscillator and powered by the emitter current of the transistor ... Older Posts Home