You will need an operation amplifier (OpAmp).

Circuit diagrams can be found with Google image search.

https://www.google.com/webhp?tab=ww&#q=emg+opamp

https://www.google.com/search?q=emg+opamp&tbm=isch

Regards,

Joachim

ECG or EMG?

EMG means ElectroMyoGraphy is a test which checks the health of the muscles and the nerves that control the muscles.

ECG means ElectroCardioGram is a diagnostic tool which is routinely used to assess the electrical and muscular functions of the heart.

which circuit do you need?

You can find a model description here:

"A Dynamical Model for Generating Synthetic Electrocardiogram Signals" by Patrick E. McSharry

or here:

"Filtering Noisy ECG Signals Using the Extended Kalman Filter Based on a Modified Dynamic ECG Model" by R Sameni

Hope this could help you

Dear you can try following code in MATLAB for ECG generation :

run = 1;

while (run == 1)%while loop allows user to run the program again if they want to

%build x axis array

x=0.60008:0.00008:1.4;

%query user to see if want to create a defualt typical ECG or custom ECG

default=input('Press 1 if u want default ecg signal else press 2:\n');

if(default==1)

%default waveform values

li=30/72;

%P wave and PR interval default settings

a_pwav=0.25; %P wave amplitude

d_pwav=0.09; %P wave duration

t_pwav=0.16; %PR interval. This combined with P wave duration defines PR segment

%Q wave default settings

a_qwav=0.025; %Q wave amplitude

d_qwav=0.066; %Q wave duration

t_qwav=0.166; %not adjustable in program

%R wave default settings

a_qrswav=1.6; %R wave amplitude

d_qrswav=0.11; %R wave duration

%S wave default settings

a_swav=0.25; %S wave amplitude

d_swav=0.066; %S wave duration

t_swav=0.09; %not adjustable in program

%T wave default settings

a_twav=0.35; %T wave amplitude

d_twav=0.142; %T wave duration

t_twav=0.2; %ST Interval

%U wave default settings

a_uwav=0.035; %U wave amplitude

d_uwav=0.0476; %U wave duration

t_uwav=0.433; %not adjustable in program

else

rate=input('\n\nenter the heart beat rate :');

li=30/rate;

%p wave specifications

fprintf('\n\np wave specifications\n');

d=input('Enter 1 for default specification else press 2: \n');

if(d==1)

a_pwav=0.25;

d_pwav=0.09;

t_pwav=0.16;

else

a_pwav=input('amplitude = ');

d_pwav=input('duration = ');

t_pwav=input('p-r interval = ');

d=0;

end

%q wave specifications

fprintf('\n\nq wave specifications\n');

d=input('Enter 1 for default specification else press 2: \n');

if(d==1)

a_qwav=0.025;

d_qwav=0.066;

t_qwav=0.166;

else

a_qwav=input('amplitude = ');

d_qwav=input('duration = ');

t_qwav=0.166;

d=0;

end

%qrs wave specifications

fprintf('\n\nqrs wave specifications\n');

d=input('Enter 1 for default specification else press 2: \n');

if(d==1)

a_qrswav=1.6;

d_qrswav=0.11;

else

a_qrswav=input('amplitude = ');

d_qrswav=input('duration = ');

d=0;

end

%s wave specifications

fprintf('\n\ns wave specifications\n');

d=input('Enter 1 for default specification else press 2: \n');

if(d==1)

a_swav=0.25;

d_swav=0.066;

t_swav=0.09;

else

a_swav=input('amplitude = ');

d_swav=input('duration = ');

t_swav=0.09;

d=0;

end

%t wave specifications

fprintf('\n\nt wave specifications\n');

d=input('Enter 1 for default specification else press 2: \n');

if(d==1)

a_twav=0.35;

d_twav=0.142;

t_twav=0.2;

else

a_twav=input('amplitude = ');

d_twav=input('duration = ');

t_twav=input('s-t interval = ');

d=0;

end

%u wave specifications

fprintf('\n\nu wave specifications\n');

d=input('Enter 1 for default specification else press 2: \n');

if(d==1)

a_uwav=0.035;

d_uwav=0.0476;

t_uwav=0.433;

else

a_uwav=input('amplitude = ');

d_uwav=input('duration = ');

t_uwav=0.433;

d=0;

end

end

pwav=p_wav(x,a_pwav,d_pwav,t_pwav,li);

%qwav output

qwav=q_wav(x,a_qwav,d_qwav,t_qwav,li);

%qrswav output

qrswav=qrs_wav(x,a_qrswav,d_qrswav,li);

%swav output

swav=s_wav(x,a_swav,d_swav,t_swav,li);

%twav output

twav=t_wav(x,a_twav,d_twav,t_twav,li);

%uwav output

uwav=u_wav(x,a_uwav,d_uwav,t_uwav,li);

%ecg output

ecg=pwav+qrswav+twav+swav+qwav+uwav;

figure(1)

%ecg

plot(x,ecg);

%Query the user to see what they want to do with the ECG waveform

fprintf('Enter 1 to send to 33521A or 33522A\n');

fprintf('Enter 2 to send to .CSV file\n');

fprintf('Enter anything else to exit\n');

whereTo=input('Enter: ');

if(whereTo==1)

%query user for waveform name

arbName = input('Enter a name for the waveform: ','S');

ecgScaled = ampScale(ecg); %scale waveform amplitude for AWG

arbTo33500(ecgScaled,arbName); %send arb to a 33521A or 33522A

elseif(whereTo==2)

%query user for name of CSV file where waveform will be stored

csvName= input('Enter a name for the waveform: ','S');

csvName = [csvName '.csv'];

dlmwrite(csvName, ecg', 'coffset', 0, 'roffset', 0);

else

%fprintf('do nothing\n');

end

%Query the user to see if they want to run the program again or exit

run = input('Enter 1 to run program again or any other number to exit: ');

if(run ~= 1)

run = 69;

end

end

fprintf('Done and outta here.......\n');

ECG and EMG both are required..

Thank you for your answers.

Scott Harden's website has some extremely basic designs that work.

http://www.swharden.com/blog/images/simple_ecg_circuit2-525x374.png

http://www.swharden.com/blog/images/diy_ecg_circuit-500x449.png

If your version of 'simple' is more complicated, there are reference designs on the TI.com medical front-ends page which might help.

http://www.ti.com/lsds/ti/data-converters/medical-analog-front-end-products.page

Thank You Sir...