It is not to be precise. You can use 5, 4 or 7V. Adjust value of resistors to limit current to LEDs.1. Why only 6V AC is ude for detection. why not 5, 4 or 7V
Most probably its a typing mistake. Consider it as "6V DC".2. How can a AC source drive a transistor in active region.
Sounds plausible. The electrolysis problem holds, however.Most probably its a typing mistake. Consider it as "6V DC".
It's a badly designed circuit.
Usually level indicators are using AC voltage to avoid electrolysis and respective electrode corrosion.
But the transistor switches and LEDs don't actually work for AC. The base-emitter diodes and LEDs will still rectify the AC voltage, causing a DC current and electrolysis. At higher AC voltage, transistors and LEDs that aren't designed for reverse voltage operation and might be damaged. The circuit could be supplied with DC voltage as well.
Sounds plausible. The electrolysis problem holds, however.
Thanks for the reply.
So do u mean to say that I have to convert the AC back to DC to have the circuit working properly?
and can you please answer the first question. why do we need to use 6V AC only why not 5,4 or 7? I have read that "choose the supply voltage based on the electrical conductivity of the liquid" in this case its water. What is the formula to calculate it.
Thanking you in anticipation.
Siddharth
HiWhy a water level indicator shown above requires 6V why not 5V or 7V
Loss some power ? is that important here ? you think that some mili watt is important ?This type of desgin may loss some power ...
Hi
Loss some power ? is that important here ? you think that some mili watt is important ?
Goldsmith
Calculate the power consumption ! Ploss of transiostors = VCE*ic and the transistor works in on/ off state where in on state voltage is nearby zero ( approx ) and in off state current is nearby zero so the loss power is insignificant .Most of the time the Tank has full water ....
so the 5 transistor, most time is in ON mode .
Sir ,thats why I think it is not better circuits .
But Only this type of desgin are there ?
You're confusing me . what you mean by that ? do you mean how to measure it ? or how it works ? i can't catch your right meaning . so describe it accurately please .Means, here testing each transistor's base voltage ?(at different level )
it can be easily done by some op amps or just one op amp in linear mode . or some transistors or just one transistor with some leds with different colors . or ... there are to many ways for a water level indicator .Design means , any other type of water level indicator . (using other transducer ).
Don't worry about it , english is not my native language too :wink:Sorry for my bad English ..
One LED ? it is impossible unless with changing the glow of the LED which is not precise . another way is using an LCD to write level of water .i asked you to that is there any other type of desgin other than the using multi leads for detecting the water ?
means something new ?
is there any desgin to detect the whole level by a single lead (electrode ) ?
Then sorry for my misunderstanding at that time . ( it was morning and i was awaken since it's last night ! )Sir I meant not an LED its i meant lead .
For example :- I have an idea using a 2 lead of electrode which is dipped in water to sense the level by detecting the current .
is there a different current with different water levels ? And can we calculate the current levels as water levels ?
A conductive continuous level measurement has the drawback of depending on water conductivity which might vary over several orders of magnitude. A more accurate method (used in some commercial sensors) is a capacitance measurement using an isolation coated electrode.Sir I meant not an LED its i meant lead .
For example :- I have an idea using a 2 lead of electrode which is dipped in water to sense the level by detecting the current .
is there a different current with different water levels ? And can we calculate the current levels as water levels ?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?