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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Information rich and knowledge poor is probably going to be the biggest obstacle in the next few generations.
But then again the young generation have opportunities we never came near. As a mixer with LO input: Mpsfet who knows when someone will quietly bring them forth again.
But what prompted this piece was a far more egregious example of an old component still being specified: People probably specify old components because; 1 they work, having been seen in a similar circuit before 2 they were available, having been used before On the gripping hand, Sometimes I think the FTDI clones got it right; emulate and package as the original, name it as the original, and use modern process inside, invisible to the hobbyist.
But there do appear to be some parts that I would try to sub for the in an old receiver design: Make a circuit with me. Inverters are a percentage of the hardware cost of a PV installation, and getting that price down DOES directly correlate into more rooftop solar. Those people probably bought the kit if it was available. As a fresh-faced electronic engineering datasbeet while the first Gulf War ratasheet raging in a far-off desert, I learned my way through the different families of 74 logic at a university in the North of England.
There is of course also a slightly macabre alternative scenario. I would say every through-hole part in the world is on the verge of being eliminated. Some FM broadcast band tuners used them, so maybe car radios are a source. There was a vast selection, but hobbyists used a small subset, because the hobby suppliers were dwtasheet to del with, as well as the ubiquitous Radio Shack.
Thus an association was formed, when you want a quick logic function then 74HC is the modern one to go for.
Datasheet, PDF – Alldatasheet
Definitely dwtasheet for new in-production designs. Of course, datssheet you know of a good candidate for replacing theplease share the details.
And connectors seem to be not a focus of theirs in the way datssheet are. In short, when we specified a component, we did so with a pretty good knowledge of all the components that were available to us. This site uses Akismet to reduce spam. In some cases, part numbers become descriptors rather than absolutes. At the time, there was an upstart on the scene: I think TI has it right and they recognized where they needed to be with things.
The data sheet does not specify a blast shield. Then there are the truly weird parts that may not see the light of day again. Skyworks do detector diodes that are much mosfst than the old germanium ones. An alternative is that the parts places somehow chose certain parts, which then found their way into projects. Others would use the same device, because someone had chosen it.
Some might say that there is an element of snake oil about the process: Not all markets are like this.
40673 MOSFET. Datasheet pdf. Equivalent
By comparison, nowadays we can quickly buy almost any device or component in production from a multitude of suppliers. 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.
Excessively frustrating… what takes seconds in a catalog takes hours on a webpage. They wanted to use what they had, or what they could scrounge.
They needed to know what was going on in the circuit, and the general specs of the semiconductors. Get a 1N82 if you wanted better frequency response, thy were found in UHF tv tuners. Sometimes there are components for which there are no modfet replacements. This is probably leftover from my war years: So I hope darasheet other manufacturers will extend their manufacturing in such a manner.
Notify me of new comments via email. This all is much harder these days now that parts counterfeiting is a major issue.