General > General Technical Chat
Pls simulate this active electrode using Ltspice or other simulators
loop123:
--- Quote ---The TL062 is a rather noisy low cost, low power op-amp. There are many alternatives, though low noise often comes with a high supply current. A still not very expensive option could be an OPA377. If one cares more about the low frequency part also the OPA202 could be an option. If cost is less an issue, consider the OPA145.
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Expensive is no problem, I mean it's not we are talking about a $1000 Op-amp but perhaps $50 vs $5. So $50 is fine. So what is best highest performing Op-amp in the world with frequency from 0 to 20,000Hz with noise of 5nV/sqrt (Hz) or lower. If say in rare chance the pin is similiar to the Olimex active electrode shown in original message. Can I just replace the TL062 chip with it and every other components the same or does one have to create a new circuit from scratch? It is difficult to miniaturize it.
My units are fully battery powered. And even have resistor and DC-converter protection to limit all DC to mere 60mA, it has full fledge isolator too but people just keep convincing me 9V can't electrocute you and the sailor story is a myth. So I may not use the isolator because it contributes to a lot of noises that makes microvolt resolution too noisy.
--- Quote ---Even if isolation is guaranted, since the electrode side is not AC-coupled and the circuit is on a single supply, you will also probably have a DC voltage between the electrode and its return path, which we don't see here. What's the return electrode connected to? If this is to your circuit's ground, that's not great.
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What do you mean there is DC voltage between the electrode and its return path? The DC power will pass through the leads. And it will be connected to ground and 5V in the main amplifier. And what has it got to do with not being AC-coupled. Kindly explain more. Thanks.
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