Hero999
Banned
Tell me where it says that?
https://en.wikipedia.org/wiki/India
https://en.wikipedia.org/wiki/India
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Look in Google for Uncivilized Countries and India is listed.Hero999 said:Tell me where it says that?
audioguru said:Look in Google for Uncivilized Countries and India is listed.
Many people interchange the terms "uncivilized" with "the 3rd world".
Anther term used for a different culture is "barbaric".
hello people...
We are working on a project to control certain home appliances such as a tv using eye movements. The first step of this project involves the extraction of signals caused by the human body due to eye movements.
since these signals are extremely small, (250 to 1000uV) we had to amplify them. We designed an instrumentation amplifier of gain around 1000 using LM741 op-amps. However still we couldn observe the signals on the CRO in our lab. all that we could see was noise.
We tried to purchase instrumentation amplifier such as AD620 and Ad622. Unfortunately they are not available to us.
What possibly could have gone wrong? and pls offer suggestions on how our task can be accomplished.
Hero999 said:You obviously haven't read the rest of the thread, he's altready tried the 741 and had problems with it because it's a poor quality old op-amp.
audioguru said:The opamps in an instrumentation amp IC are all matched, have very low noise and have very low input offset voltage. The resistors inside are also extremely well matched.
It would be extremely difficult to make one with separate cheap old opamps and ordinary resistors.
I guess medical scientists did that 40 years ago.
raviram87 said:definitely not sir....
but the problem is we are not getting the ic here... i tried it... they are quoting a very high price... more than the price for which they are being sold on the net... for example an ad620 which costs 4.27$ on the net is being sold for approx. 13.75$ here... american $ i mean....
so am trying out all other possible ways of getting that IC here.... :-(
raviram87 said:hmmm.... ok...
is there anyway i can get them for a cheaper cost? i tried in bangalore and chennai.... the best i coud find was for 14$ or so....
This is a HUGE world with different cultures.raviram87 said:@sharma...
13 minutes to earn a AD620....
i confirmed availability of AD620 with Micro-components at 080 4123 4126 (Mr Kiran Kumar) and is available at approximately Rs200/- amouting to $4.5raviram87 said:@sharma...
thank u so much for ur help... will try contactng him....
13 minutes to earn a AD620.... actually i don't mind that doin it rite now....![]()
Even if they give SMD take and use it you can easily wire it up. with little extra effort.raviram87 said:thank u so much for ur timely help mr.sarma....
this is amazing.... will immediately contact him....![]()