Hi,The LM329DZ is listed as obsolete and out of stock with the vendors I have checked here in the United States. I found that an eBay seller has a stock of National Semiconductor LM329DZ's which are being sold for $9.95 for each lot of 5. It appears that they have 25 lots remaining.
Yep, that's fine, and what I should put on the BOM.The AD825 does not appear to be available and/or just not a stock item here in the USA. Would the AD825ARZ be an appropriate device?
The LM329DZ is listed as obsolete and out of stock with the vendors I have checked here in the United States. I found that an eBay seller has a stock of National Semiconductor LM329DZ's which are being sold for $9.95 for each lot of 5. It appears that they have 25 lots remaining.
TL431 makes good adjustable voltage ref RC filter output as desired...
I don't know if they are still as generous, but ADi used to be great for free sample requests...
Yes you could and I have but performance will depend upon the common mode input voltage range of the opamp in use. If the opamp is running off voltage rails of 5v and 0v then it is best to keep the input voltage as close to mid rail as possible. It also makes the calculation of the feedback resistors a doddle. 1k each. Walter Jungs GLED is an even quieter reference at near 2.5volts. One resistor, one green LED and a particularly quiet PNP. Worth a google.Couldn’t you use just one green led for the voltage ref on the 5v (and lower) versions