buying component :)

Hi,
Can anyone help me how to buy component from web site?

I want to build an ECG Front End shown below
**broken link removed**

Can anyone teach me how to choose the correct component?

AD620
**broken link removed**

LF412
**broken link removed**

Example for AD620 in the web site there is AD620ERZ , AD620ANZ, AD620ARZ

I’m confuses to choose the correct components.

Can anyone please help me?

Thanks a lot

Looking at the suffix for the AD620, the "N" means through hole, and the "R" means surface mount. So AD620ANZ is through hole, and AD620ARZ is surface mount. The "Z" means it is not RoHS compliant, it has lead. The difference between "A" and "B" is that "B" has lower offset and gain error, as shown on page 3 of the spec sheet - https://www.electro-tech-online.com/custompdfs/2012/01/AD620.pdf
I do not find a AD620ENZ.

For the differences in the LF412C, look at page 3 here - https://www.electro-tech-online.com/custompdfs/2012/01/lf412.pdf

Hi thanks,

If is "N" means through hole
I can use bread board to do the conncetion.
"R" surface mount how to do the conncetion for surface mont?
RoHS compliant mean?? with RoHS compliant is good or bad?
http://www.rohscompliancedefinition.com/

Thanks alot

If something is RoHS complaint it is good. It means that there are no harmful chemicals in the product namely,

Lead (Pb)
Mercury (Hg)
Cadmium (Cd)
Hexavalent chromium (Cr6+)
Polybrominated biphenyls (PBB)
Polybrominated diphenyl ether (PBDE)

If something is non RoHS it means it contains one or more of the substances listed above

Dave

Hi,

How to choose the correct Resistor and Capacitor?
I know the value but there alot of kind out there..

Resistor
**broken link removed**

Capacitor shown below
**broken link removed**

Note use the CATEGORIES at the web of the web site to select

Give Search a value, like "Resistor, 2k, .25W"
If you are doing breadboard, this will be through-hole, and "categories" will show something like this -
**broken link removed**

Carbon resistors are fine for most things, but for instrumentation like this you may want to use metal film.

Hi guys,

I want to test components on bread board so I need to buy components with “N” mean through hold
For AD620 I decide “Analog Devices AD620ANZ”

For LF412 is not the same it have LF412CNNOPB, LF412CP so many in the list shown in the list below
**broken link removed**
Which one should I decide?

Example for Resistor, metal film, precision, 0.25W, 0.1% , 2KΩ is good enough?
How about capacitor?

Question:
1) How to choose the correct LF412 (tested on bread board)
2) How to choose the correct resistor beside metal film (spec)
3) How to choose the correct Capacitor (spec)
4) I want a resistor value 148KΩ Can i buy 2 or 3 resistor and series to make it 148kΩ
4) Any advice of buying components

here is the ECG Front End link shown below
**broken link removed**

Hi,
Thanks

how about capacitors?
**broken link removed**
example 10µF and 100nF

duffy said:

Give Search a value, like "Resistor, 2k, .25W"
If you are doing breadboard, this will be through-hole, and "categories" will show something like this -
**broken link removed**

Carbon resistors are fine for most things, but for instrumentation like this you may want to use metal film.

Click to expand...

Hi,

How about capacitor?
example 100nF and 10uF.
**broken link removed**

Appreciate for your advise.
Thanks

These ceramic caps would be fine for the smaller values - **broken link removed**
For the bigger one, a nice low-impedance aluminum electrolytic like this is appropriate - **broken link removed**