I went on Digikey, armed with a data sheet, and there do appear I searched on “MOSFET dual gate” and RF Fets, and found a bunch. MOSFET datasheet, cross reference, circuit and application notes in pdf format. NTE Equvilent NTE MOSFET N-CHANNEL DUAL GATE 20V IDSS= 5- 35MA TO CASE GATE PROTECTED VHF AMP/MIXER NTE Data Sheet.

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40673 MOSFET. Datasheet pdf. Equivalent

Great article all the same. But a cheap opamp was the same part. This is not feasible datashedt hobbyists and specialists from other fields.

Now all gone, the average cellphone today has no useful parts. Now all this said there is perhaps a different case for the ol TL and the likes but still they 406733 cheap.

The Curse Of The 40673: Zombie Components That Refuse To Die

A part that has been in use for a long period of time has proven its worth. Use those Schottky diodes that arrived in the later sixties, and use four if them in a balanced mixer, often a better choice for an overload resistant mixer. I appreciate your criticism not because the criticism is correct, but rather it is an accurate observation about the lack of part availability.

This is probably leftover from my war years: Some might say that there is an element of snake oil about the process: Definitely not for new in-production designs. So blindly switching from HC to AC is a bit dangerous. Sometimes there are components for which there are no perfect replacements.

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Information rich and knowledge poor is probably going to be the biggest obstacle in the next few generations. Thus an association was formed, when you want a quick logic function then 74HC is the modern one to go for.

Skyworks do detector diodes that are much better than the old germanium ones. I actually try to use as few different components as possible, to reduce storage requirements and simplify design.

But then again the young generation have opportunities we never came near. There is of course also a slightly macabre alternative scenario.

Datasheet(PDF) – New Jersey Semi-Conductor Products, Inc.

The beginner was at the mercy of the parts list, buying that expensive HEP IC because he wanted to follow the article exactly out of fear of making a mistake, not realizing the author specified that HEP replacement line part because it was very available. The 45 dB range 8 bits in voltage devices are dirt cheap and super common.

No, I think gate devices are old hat now, better use a gate one…: You had to buy the kit, or hope the author would supply the IC.

There are markets where product life expectancy and maintainability are more of concern and this introduces some other dynamics. But perhaps that meant stock. But what prompted this piece was a far more egregious example of an mosdet component still being specified: And people wonder why I hoard old analogue TV tuners.


The big daddy of dead tree reference was the Thomas Register: The hobbyist, like the supplier, could keep a limited selection around, yet build anything within a certain level of specs. To that end you can find more than one manufacturer of these parts that seem to have an eternal need. Same goes for capacitors: You are commenting using your Twitter account.

My understanding is that they have a reasonably good NF and they allow you to build a combination mixer-amplifier in a single device. I bought a few last-buys.

What the full-blown rant in the previous paragraphs has been building up to is this: There was a vast selection, but hobbyists used a small subset, because the hobby suppliers were easier to del with, as well as the ubiquitous Radio Shack. Launched in the mists of time when dinosaurs probably still roamed the earth, this static-sensitive four-pin TO72 found a home in a huge variety of RF amplifiers, oscillators, and mixers.

Unless you want to, that is. Given these are devices from a past generation, the BF others mentioned certainly seems to fill the bill for a replacement and you can buy them by the bag-full from the usual Asian suppliers. As far as I know, those boards are still being built the same way today.