Hi, I want to know what is the proper methods to prolong lithium battery life:
When Should I recharge the battery(at any level 90%, 70 or 40 etc)?
Should I charging it fully at 100%?
is true that discharging battery below 20% once each month is useful to boost battery life?
i know that i am using the hard way, i do that because my supervisor want me to do that.
the main noise is come from electrical 50 Hz, even when i removed it, the noise still large value(about 0.1 to 0.2 V)
yes i want to record a row data.
yes i understand the aliasing issues , i will...
ok, let me explain:
ECG signal is obtained by using preamplifier as figure below:
i want to record ECG signal but without using preamplifier, first i will record the two signals come from right and left arms, then inside the computer(by using matlab) i will obtain the ECG signal...
yes i read it, i understand that this chip use one ADC for each channel
i am not sure, but may be i need about 1 micro second difference between sampling the two signals
not less than 200 Hz.
i will search for these questions
I need to record a two analog signals, by using an ADC(of 20 bits resolution or higher), the two signals are very weak signals of signal to noise ratio about -30 db, so the two signals are very effective by the noise.
the problem is : how to record these two signals at the same...
I read information said that:
the turing machine can only execute one program
the universal turing machine is Re-programmable machine
the information here:
I read many articles about turing machine,but i still confused:confused:
is a turing machine can only execute one program(hardwired) ?
or it can execute many programs(like a conventional computer)?
i asking about turing machine as shown in figure blew(not asking about universal TM...
i will give example:
if we use the direction of Electron spin to represent the Qubit,spin up= 1 spin down=0
each electron could be spin up and down simultaneously (two states at the same time)
but if we have 3 Qubits, we will get a 8 states simultaneously ,
that mean each Qubit has a 8...
I read this information about the Qubit:
"N Qubits are equivalent 2^N classical bits (2^N states)"
But I couldn't understand that, because I know that each single Qubit could be one and zero at the same time, so each single Qubit is equivalent two classical bits (two states)
I read in many book, the ecg lowpass filter is 100 hz cutoff frequency
Yes, I think that
i also see that 80 Hz cutoff work properly but as i mentioned i am writing a research paper, my work must be
agree with a reference book or with another research paper
this is the FFT of ECG signal
it very clear that the noise 100 Hz com from power line harmonic
sample rate= 400
i am not using anti-alias filter,because the 100 Hz noise i can remove it in matlab
yes the frequency of power line in my country is 50 Hz
No solution :confused:
i built an ECG system(preamplifier and filters), but i faced a problem in the filters:
the standard of ECG filters is 0.1 Hz cuttoff frequency for highpass filter and 100 Hz for lowpass filter
but i only obtain a good ECG signal when i make the cuttoff frequency of highpass filter...
i designed an active low-pass filter,but i don't know if it correct method or not
i want fc=200 Hz and n(order)=4. i use this method:
by let C=100 nF and use this equation "fc=1/(2*pi*C*R1)"
i get R1= 8 Kohm,R2=R1
this is for one stage
to get filter of 4 order,i repeat that...
Maybe this is why ICs gets damaged!!
i touched the input lead"input pin" many times
and many times the input lead"input pin" was floating,
so:if the input pin was floating ,does the IC get dameged?
no , the IC has normal temperature
ok, i will check it soon
I bought six instrument amplifiers(AD620AN),
i tested these ICs,all ICs was work properly
but later the ICs gets damaged(5 five of 6 ICs gets damaged)
i was very carefully(by reading datasheet) about power supply and input voltage
i used this circuit(to make AD620AN work as just...