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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Not perfect, but acceptable for a lot of uses. There were always two camps. Learn how your comment data is processed. Use those Schottky diodes that arrived in the later sixties, and use four if them mostet a balanced mixer, often a better choice for an overload resistant mixer.
The other camp wanted cheap. Which exactly are the parts that have superseded the 74HC? Another example is the famous and storied 2n transistor made by Datashet Semi. The most commonly seen alternative NE is probably equally suitable, but a bit more expensive. Email required Address never made public. Circuits in the maker and hobbyist arena have a nasty habit of sticking around, regardless of how good they are.
You could pull roofing filters out of them, and crystals to convert from there to KHz, and complete KHz fm if strips. There are markets where product life expectancy and maintainability are more of concern and this introduces some other dynamics. kosfet
NTE Equivalent NTE MOSFET N-CHANNEL DUAL – Wholesale Electronics
Notify me of new posts via email. Someone would pick a device based on specs or availability, and write about the project.
Other things came long. I repaired a big brand audio Amp late last year. Some FM broadcast band tuners used them, so maybe car radios are a source.
This is probably leftover from my war years: I only buy 1 nF, 10 nF, nF etc.
40673 MOSFET. Datasheet pdf. Equivalent
We knew by heart what each device was capable of, and we eagerly devoured each new tidbit of information as it arrived. Is there even the vaguest hope of something like that for FPGAs? These were balanced mixers, the extra transistors irrelevant because it was in an IC. At the time, there was an upstart on the scene: All of your bases ARE belong to us. OK, maybe germanium diodes are an edge case and the examples above have a radio flavour, but you get the picture.
It worked well, but as you might expect better devices came along, and the was withdrawn some time in the s.
The Curse Of The 40673: Zombie Components That Refuse To Die
Because even today, thirty years after the shuffled off this mortal coil, you can still find people specifying it. They wanted mosfeh use what they had, or what they could scrounge. I appreciate your criticism not because the criticism is correct, but rather it is an accurate observation about the lack of part availability.
But a cheap opamp was the same part.
The Curse Of The Zombie Components That Refuse To Die | Hackaday
Really great UHF front end components. 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. You moved further into the dataasheet 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 PNP could often work as long as you made adjustments.
I actually try to use as few different components as possible, to reduce storage requirements and simplify design. The big daddy of dead datwsheet reference was the Thomas Register: Excessively frustrating… what takes seconds in a catalog takes hours on a webpage. 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.
I did a little searching — Dons site has a LOT of stuff! Thus an association was formed, when you want a quick logic function then 74HC is the modern one to go for.
It completely fails at about 70MHz. A part that has been in use for a long period of time has proven its worth.