Photodiode case

Not for you as the expert, of course, but for fellow readers who might not yet be familiar with PD bootstrapping:

In cases where this link doesn't work, it is Linear's Design Note 399.

You can't blame National too much for those two--they stayed around for

I still have about 25 LH0063Cs. I used those and LH4009s back in the day to test sensor back ends--you record the front end outputs for signals of interest, mainly just-missedits and squeakers-under-the-wire, and store them. To test the back ends, you grab hold of some poor op amp's output with an LH0063 and force it to replay the canned data. Works great. Too bad you can't get them anymore.

Cheers,

Phil Hobbs

They say Vos = 20mV max, what have you found in practice?

You can get good money for those. I bet National could also turn a nice little profit from them if they brought them back. I mean, they don't have to produce them domestically.

The LH0033 was also good but much harder to cool.

BTW I've got a two-pager "advanced notice" about the LF455/6/7 series from the 1988 databook. Let me know the address if you want it emailed. Interestingly, in the 95 book they are gone. Must have been one of the most short-lived opamps ever.

I've actually never used a BF862, so I ordered some....I have 4 weeks vacation left, so I have to spend it somehow. Between that and investigating copper clad shielding as a function of frequency, I think I have a fun holiday season ahead.

Cheers,

Phil Hobs

I am surprised there is no detailed noise data available for it. For example how the noise develops for audio and below. From a marketeers perspective I don't understand that lack.

in my small sample of about ten devices : 6 mV max , 3mV more common.

Jure Z.