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#2665 25/08/05 5:49 PM
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hello i am a new member and was wondering if i could git a copy of the drawing of the ekg simularor sent to my e-mail www.erik@excellmedical.com if eney one could do this it would be grate thanks

#2666 01/09/05 10:51 PM
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Are these simulator any thing like as good as the lionhearts we use to test propaq kit with? If so send us a circuit diagram please.

#2667 15/09/05 6:47 PM
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hi anybody can send me ecg/ekg simulator at bluesintown@yahoo.com

#2668 16/09/05 7:52 AM
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I have devised a very simple circuit that most people could make without a circuit diagram. (I hope confused ). It is based around a pre-programmed ROM. This I am afraid you will have to make for yourself. Do people still have the facilities for blowing their own ROMs or am I showing my age? boggle
The MSBs of the ROM are connected to a Hex switch to selects various waveforms which are programmed in to the ROM, these are cycled round using a variable speed clock (555) and counter connected to the LSBs. Then a D to A and filter gives you your output.
Not fancy, simple and basic, no need for complicated C programming etc., but what do you expect for homebrew. If you want random ectopics etc, pay the companies for their fancy boxes.
If you want lots of leads at once use lots of ROMS in parallel or just put different filters on the output if you do not need vastly different shaped waves. (And why do you?)

I have even seen analogue simlulators that used a few linked and half-wave rectified oscillators to produce the P, QRS and T-waves. I challenge anyone to build that from scratch these days. Again with multiple outputs from the one source waveform.

To programme the ROM draw a few waveforms on graph paper and then work out the values at enough time intervals. You do not need many, you are dealing with very low frequencies so can filter out the noise. And if it comes through, so what? You are making a test box not a diagnostic tool.
Contact me if you want more details

Robert

PS Why do people want all these ECG simulators? Does anyone actually test waveform analysis systems? If you just need it for a go-nogo test of leads and monitors why not use a low frequency signal from a signal-generator? It might not look correct on the screen but it does the job.


My spelling is not bad. I am typing this on a Medigenic keyboard and I blame that for all my typos.
#2669 16/09/05 8:58 AM
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I helped a colleague of mine program ECG simulator code based around a PIC micro in about 3 hours. He basically designed and built the simulator from scratch. Interrupt driven pushbutton inputs, LED indicators, PIC, DAC, Voltage Reg, OP-AMP and resistor ladder network. Sin, ECG (30/60/120/180/240 BPM), pulse, 1mV/0.5mV/2mV (LdII). The guy (who was only doing HNC) built the electronics and I provided some assistance with the ICE system and coding.

A graduate Engineer asking for the circuit and code is just being lazy. Small flash-programmable development systems cost peanuts these days - no EPROMS, etc, programmed via USB/RS232. Feed a digitised waveform (represented by integer samples) at the appropriate rate from memory into a DAC, use appropriate scaling in software or op-amp and drive a resistor ladder with it. It produces an effective simulator if you use interrupt timers to detrmine pulse periods hence produce precise rates and amplitudes. You could sample standard ECG signals from amplified sources to obtain truly representative simulator ECG waveform/s.

#2670 16/09/05 9:14 AM
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Bravo, Richard! smile


If you don't inspect ... don't expect.
#2671 16/09/05 9:26 AM
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Of course I am only suggesting the development and use of such a device for a "college project" or other such endeavour rather than for "professional use".

#2672 07/10/05 3:04 AM
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Hi Das, Pete and Paul
Are you willing to let me have a ecg simulator copy?


dsfdsgag
#2673 07/10/05 11:21 AM
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I carry three, yes three types of simulator around with me!!!! sounds stupid, but each has a functionality which the other does not.
One for an Intra Aortic Balloon pump has a feed back for simulation of the Ap signal with Balloon inflation, one has thermal dilution curves(for the picco monitor) and the final one is specific for a bio-impeadance measuring system for cardiac output.
So just testing the leads is not the only function of an ECG simulator, but why anyone would build one other than a project i have no idea!

#2674 10/10/05 12:28 PM
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To while away those slack minutes each day ;-)


Never under-estimate the predictability of stupidity
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