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?
Hi:
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...
Hi:
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...
Hi
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)
That...
Hi guys
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...
hi:
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...
Hi:
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...
Hi:
when using op amp as differential amplifier,
can it used for input signal isolated from power supply of that op amp?
as this figure:
http://uploadpic.org/storage/2011/k9bEue1EtqkWGlH5yTDN3198.jpg
so if the input signal is sinewave 5 Vp.p,
will be the output of this op amp...
Hi:
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
so
can i use this ADC directly?or i must use amplifier ??
Hi:
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,
and...
hi guys:
if i have signal(YT) consist of two frequencies(30 and 300 Hz),as the following:
t=0:1/1000:1;
Y30=sin(2*pi*t*30);
Y300=sin(2*pi*t*300);
YT=Y30+Y300;
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...