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Resistance of relay coil is 70ohm, and in led I am using 1k resistor as current limiting resistor. I am not adding any external resistance to the relay coil.
I want to drive 5v single channel relay by BC547, I am using 1k resistor at base but relay is not working. I replaced relay with a led and it works fine. So can anyone tell me why led is working but relay is not working.Also I tested voltage by replacing relay at the terminal and it was 5v but...
I have ultrasonic flow meter in which its total reading is reset by mistake. I want to get the total reading upto that mark. So can anyone help to increase its reading manually.
Details of hardware:
This is ultrasonic transducer based in which 2 transducer are given. One is UP and another is...
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