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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Someone would pick a device based on specs or availability, and write about dataaheet project. Zombie components are alive and well in the aviation world. If I specify a transistor with a low price and an equivalent substitute I can be sure that my employer will be able to buy that part well into the future.
The Curse Of The 40673: Zombie Components That Refuse To Die
Now all this said there is perhaps a different case for the ol TL and the likes but still they are cheap. Happened to stumble across two of those in my old bag of bits just the other day. If HC does your job then of course, use it. And people wonder why I hoard old analogue TV tuners.
Inverters are not particularly space constrained. I thought is was diode, cathode, electrode, overload, generator, oscillator. In short, when we specified a component, we did so with a pretty good knowledge of all the components that were available to us. OK, maybe germanium diodes are an edge case and the examples above have a radio flavour, but you get the picture.
Printed catalogs still exist, but the sheer volume of information they contain forces brevity upon their datashheet and expands the size of the publication to the point at which it becomes an unwieldy moseft of reference.
For me to do good work Datawheet have to have a good concept of the parts catalog and keep up with new parts from suppliers and the state of the industry.
Detector diodes have modern replacements, but power germaniums do not, and I have searched hard! You moved further into the hobby and learned where you could substitute parts, you came to know the familiar solid state devices so you knew that diode was germanium and needed germanium, but that small NPN signal bipolar transistor in an audio oscillator could be just about any small signal transistor, so long as it was NPN, and even then a Datashwet could often work as long as you made adjustments.
NTE Equivalent NTE MOSFET N-CHANNEL DUAL – Wholesale Electronics
It completely fails at about 70MHz. People probably specify old components because. Really great UHF front end components. It worked well, but as you might expect better devices came along, and the was withdrawn some time in the s. 4073 site uses Akismet to reduce spam. But there do appear to be some parts that I would try to sub for the in an old receiver design: Fill in your details below or click an icon to log in: But what prompted this piece was a far more egregious example of an old component still being specified: This is not feasible for hobbyists and specialists from other fields.
In some cases, part numbers become descriptors rather than absolutes. Maybe not feasible for mass production, but sure as hell no problem for any amateur building a circuit with only a handfull of these….
MOSFET Datasheet pdf – Equivalent. Cross Reference Search
So that may no longer be a source, especially if you want leads. An alternative is that the parts places dafasheet chose certain parts, which then found their way into projects. What the full-blown rant in the previous paragraphs has been building up to is this: A bit late but anyway, a mosfet like the can be swapped with two N jfets in cascode configuration just like in these example:. Thus an association was formed, when you want a quick logic function datashdet 74HC is the modern one to go for.
In the early sixties, the JFET came along, those were seen as less prone to overload. Something curious happened with the recent TI acquisition of National Semiconductor. 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.
Learn how your comment data is processed. Other things came long. 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. Redesigning to remove obsolescent components means going back through FAA certification. Does that mean everyone suddenly needs to not design with through hole parts anymore?
So blindly switching from HC to AC is a bit dangerous. Granted, the AD part is a much better chip. Conversely, making inverters cheaper actually has a huge effect on the market. I thought someone kept mosfer germanium, but it may be as much as twenty years since I heard that. Don Lancaster may have written something on the topic, though mosvet it might not be so easy. Which I think was not particularly good. I use HC parts as level translators with mixed 3v3 and 5v logic parts because there a good cheap option and do the job well.
They apparently have the capability to mlsfet a line for the day to get a few thousand chips and inventory them datasheeh put them up for sale. The most expensive single chip I use today catasheet the AD You could pull roofing filters out of them, and crystals to convert from there to KHz, and complete KHz fm if strips.
Most of what Burr Brown was making was carried over to AD with nary a change in part number. I am guilty of rarely using op amps, and replace them with transistors whenever possible: Digikey is one of the better ones, but still inadequate.
Inverters are a percentage of the hardware cost of a PV installation, and getting that price down DOES directly correlate into more rooftop solar. The hobbyist, like the supplier, could keep a limited selection around, yet build anything within a certain level of specs.
Information rich and knowledge poor is probably going to be the biggest obstacle in the next few generations. Great article all the same.