General > General Technical Chat
Chips with built-in RFI protection
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DiTBho:
Anyway, "FET" is the super-class of devices:

* junction field-effect transistor -> JFET is member of FET class
* metal–oxide–semiconductor field-effect transistor -> MOSFET is member of FET class
* metal–nitride–oxide–semiconductor transistor -> MNOS is is member of FET class
* insulated-gate bipolar transistor -> IGBT is member of FET classso, "FET" means nothing in this case, which one? -> it must be a typo, cannot be anything else  :o
magic:
In Texas Instruments datasheets there is exactly one thing that "FET input" can possibly mean. Take it from the horse's mouth:


They know how to ride the audiophool hype train when they have an actual JFET product to sell:



--- Quote from: JPortici on August 25, 2021, 12:14:50 pm ---There was this rumor i have no idea where i've heard it, might have been back in school so at least 10 years ago.. that TI had actually manufactured a metric crapton of wafers for the TL07x, LM13700 many years ago, they were not in production anymore and someday stock would have ended.
Yes it sounds a rumor from a guy whose uncle was working for TI but maybe.. maybe..

--- End quote ---
Well, the old TL072 is still for sale for now.
2N3055:

--- Quote from: magic on August 25, 2021, 01:29:14 pm ---In Texas Instruments datasheets there is exactly one thing that "FET input" can possibly mean. Take it from the horse's mouth:


They know how to ride the audiophool hype train when they have an actual JFET product to sell:



--- Quote from: JPortici on August 25, 2021, 12:14:50 pm ---There was this rumor i have no idea where i've heard it, might have been back in school so at least 10 years ago.. that TI had actually manufactured a metric crapton of wafers for the TL07x, LM13700 many years ago, they were not in production anymore and someday stock would have ended.
Yes it sounds a rumor from a guy whose uncle was working for TI but maybe.. maybe..

--- End quote ---
Well, the old TL072 is still for sale for now.

--- End quote ---

Problem is that new "improved" one has almost order of magnitude more noise in audio range and going down to DC it shoots towards sky..
It has some better specs, it is faster, lower input bias current, etc.
It is different enough that it deserves different name : TLM072  >:D

It might not be drop in replacement at all, depending of your circuit..

I'll stick to NJM072 ...
magic:
Sadly JRC has nuked most of their jellybean products a year or two ago. I doubt that 072 made it through.

I suppose TI undercut them on price offering parts that more accurately follow the original 1970's specs ;D
I found TI's jellybeans, including OP07, to have more flicker noise than competition. And I'm talking legitimate second source bipolar chips, no "next-generation" rubbish.
Kleinstein:
The TL072H looks really a bit different than the normal one:  nearly more like an TLE2071.
There are some improvements in some aspects, but not so much for audio.  By todays standard the TL072 is no longer a good choice for audio - more like a low cost OP  that has input common mode range close to the positive supply.

EMI filtering is now quite common with AZ OPs. The ADA4522 has some specs on it.  It is not just the expensive one from Analog, but also cheap ones from Microchip. Chances are that without sich filtering the copper stabilized OPs may be quite sensitve to RF and with increasingly more phones and WLAN this can become an issue.
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