Comments on: Building a simple ECG Amplifier

By: Uttam

Uttam — Fri, 15 Jul 2011 08:25:35 +0000

Sir,
Here TLC274 is used, but unfortunately I am not getting this IC easily, I find TLC271 or TLC272 having single opamp and band width, Db and other parameter almost similar to TLC274, and TLC272 and TLC271 are available easily,
Can i build this circuit by 4 nos. TLC 272 or TLC271 ics keeping other component same, will it effect the performance /output of the circuit. Please reply,
regards,
Uttam Dutta
u.dutta@tatasteel.com

By: zelin

zelin — Sun, 26 Dec 2010 16:31:53 +0000

hello sir:

i am just wondering if we can get some real inside working of this project wht actually is going on also can u tell if lm324 can be used instead of tlc274

regards

By: Luis Carvalho

Luis Carvalho — Tue, 16 Nov 2010 11:18:51 +0000

Dear Sir,

I have an atrial fibrillation and I would like to build your ECG amplifier to see my ECG.

But since I have not a laptop, I want to try first the amplifier with a sinusoidal wave of 1.6 v, created by an audio generator. This wave is reduced to 0.004 v, with a voltage divider.

But I have a problem: how can I simulate the electrode applied to the leg?

Best regards,
Luis Carvalho

By: Zohaib

Zohaib — Tue, 12 Oct 2010 05:10:51 +0000

man if does’nt use the BAS45A diode
what will be its effect on ckt, does it malfunction
and what will happen if we use IN4148

By: Sebastian Schaetz

Sebastian Schaetz — Thu, 07 Oct 2010 22:57:46 +0000

Abdul, you can check the properties of BAS45A and find a diode with similar properties at for example farnell.com.

By: abdul

abdul — Thu, 07 Oct 2010 16:49:53 +0000

please tell me equivalent diode of BAS45A?

By: Sebastian Schaetz

Sebastian Schaetz — Thu, 30 Sep 2010 12:33:00 +0000

Yes K1 is an oscilloscope probe.

By: Rahimi

Rahimi — Fri, 24 Sep 2010 07:27:28 +0000

Hi,

i wanna ask, how to connect the circuit to AD converter?what is K1?is it oscilloscope probe?

By: Sebastian Schaetz

Sebastian Schaetz — Thu, 08 Jul 2010 08:09:33 +0000

The circuit uses the TLC274, an operational amplifier.
I’m not sure if the circuit could properly amplify from .5 to 100Hz, but I believe so.

By: nuhri

nuhri — Wed, 07 Jul 2010 17:51:58 +0000

hi, i just wanna ask if this circuit can detect waveforms whose frequency range is from 0.5 Hz to 100 Hz. also, does this circuit include an instrumentation amplifier? if yes, what type of Instrumentation amplifier does this circuit use? thanks much. :)