Buzzers
Fire Alarm
Circuit The circuit makes use of characteristic of a diode. As already explained normally diode conducts only in one direction and it blocks voltage in the reverse direction. However there will be a little leakage current flowing through which is normally negligible. But if the temperature increases, this leakage current also increases and this effect [...]
Water Low Level Alarm
Same buzzer, the same power supply but with a little ingenuity this gives an alarm when the water falls below a certain level.This circuit as shown in Schematic 7, which can be used to indicate when the level falls low in overhead tank, a sump or even in a bore well.Now you will find a [...]
Water High level Alarm
This can be used as an alarm when filling overhead tanks. Quite some time ago, I used it as an indication when the municipal water used to start flowing to my pipeline. When I built this project, happiest one was my mother. Municipal water used to be pumped in the midnighl at unearthly hours and [...]
