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 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 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 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 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...
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...
when using op amp as differential amplifier,
can it used for input signal isolated from power supply of that op amp?
as this figure:
so if the input signal is sinewave 5 Vp.p,
will be the output of this op amp...
i have ADC(analog to digital) has a resolution 12 bits
and the input range is from +50mV to -50mV,
this men the precision is about 24uV
i want to use this ADC for a signal has Vp.p from 0.7mV to 1mV
can i use this ADC directly?or i must use amplifier ??
when we use Limb lead placement(RL,LL,RA and LA electrodes) we can obtain six signal:
I,II,III,aVR,aVL and aVF
The question is:
Are These six signals shown(on paper or screen) individually?
or there is another method?
Hi guys:I have a project to design ECG
i want to calculate the six leads(I,II,III,aVR,aVL and aVF) by this method:
i will measure the voltage of three probe or electrode(RA,LA and LL) RL as a reference
by using DAC(digital to analog converter) the DAC connected to PC computer,
if i have signal(YT) consist of two frequencies(30 and 300 Hz),as the following:
i want remove the frequency of 300 Hz from(YT) by using low pass filter
so how can i do that(by using matlab command)?
hi guys i like this forum:smile:
if we have a transformer(star type),,has three phase(a,b and c) and has also neutral ,
let Vphase=220 R.M.S
if the neutral of this transformer is not grounding"neutral hasn't any contact with earth"
my question is:
if we put a voltmeter between the earth...