This is the simple 5V DC supply output circuits diagram.In the Positive Half cycle the Diode D1 conducts,and the Negative Half cycle the Diode D2 conducts. these two Diodes are conducts simultaneou…
Source: DC Regulated Power Supply
This simple transistor based water level indicator circuit is very useful to indicate the water levels in a tank. Whenever tank gets filled, we get alerts on particular levels. Here we have created 4 levels (low, medium, high and full), we can create alarms for more levels. We have added 3 LEDs to indicate initial three levels (A, B, C), and one Buzzer to indicate FULL level (D). When tanks gets filled completely we get beep sound from Buzzer.