s, probably now worth more by weight than anything else on four legs .. I went on Digikey, armed with a data sheet, and there do. NTE Equvilent NTE MOSFET N-CHANNEL DUAL GATE 20V IDSS= 5- 35MA TO CASE GATE PROTECTED VHF AMP/MIXER NTE Data Sheet. Tube or Röhre ID, Transistor, Wires and VHF shown. Radio tubes are valves.

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I use a as a mixer as it happens, and in my application you start to hear the performance tail off somewhere above 4673 with the HC part. Hang on, this is Hackaday. I would say every through-hole part in the world is on the verge of being eliminated. The big retailers still have catalogs. I used it a fair bit.

Of course, if you know of a good candidate for replacing theplease share the details. By comparison, nowadays we can quickly buy almost any device or component in production from a multitude of suppliers. Digikey is one of the better ones, but still inadequate.

Manufacturer names and part numbers would be better. Another example is the famous and storied 2n transistor made by Central Semi.

I think TI has it right and they recognized where they needed to be with things. I appreciate your criticism not because the criticism is correct, but rather it is an accurate observation about the lack of part availability.

But in all fairness, still a dodo of a component. Yes, noise figure factored in, at least if you were doing something on VHF or higher.

Datasheet, PDF – Alldatasheet

But there do appear to be some parts that I would try to sub for the in an old receiver design: Datasheett required Address never made public. Circabipolar transistors also had improved noise figure. I want to search for a connector that is small with 14 pins. Because radios are now becoming all microprocessor and nothing else, does that mean that someone should stop designing mixers using transistors?


40673 MOSFET. Datasheet pdf. Equivalent

Germanium point-contact diodes, for example. One datssheet to be able to buy the exact parts specified, preferably at Radio Shack. Some might say that there is an element of snake oil about the process: Now all this said there is perhaps a different case for the ol TL and the likes but still they are cheap.

A Understand the actual requirements for the circuit dstasheet is non-trivial for the non-EE B Know what in the datasheet reflects the requirements you have and C Be able to compare apples with oranges; or rather, be able to comprehend all the differences and similarities and interpret vastly different families of devices into different usage cases.

Information rich and knowledge poor is probably going to be the biggest obstacle in the next few generations.

The beginner was at the datadheet of the parts list, buying that datasheeet 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 only buy 1 nF, 10 nF, datasjeet etc. Notify me of new comments via email.

A bit late but anyway, a mosfet like the can be swapped with two N jfets in cascode configuration just like in these example: My understanding is that they have a reasonably good NF and they allow you to build a combination mixer-amplifier in a single device.

And connectors seem to be not a focus of theirs in the way semiconductors are. Then there are the truly weird parts that may not see the light of day again.

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

It worked well, but as you might expect better devices came along, and the was withdrawn some time in the s. Datassheet 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. To that end you can find more than one manufacturer of these parts that seem to have an eternal need.


I bought a few last-buys. So I hope that other manufacturers will extend their manufacturing in such a manner. And you can go from e. How times have changed.

This is probably leftover from my war years: I used my time as a student as an example because it happened to be where I first saw an HC device. Thus an association was formed, when you want a quick logic function then 74HC is the modern one to go for. Epoxy-blobs, I tell you!

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

For me to do good work I have to have a good concept of the parts catalog and keep up with new parts from suppliers and the state of the industry. Ahh, you can help me with building my quasi nuclear phase locked loop synthesized equalizer.

The most expensive single chip I dtaasheet today is the AD Those were big ones too. So you take your 5-year guaranteed availability promise if you even get one, be grateful as hell for it — yes sir, very well sir, thank you sir — and call it a day. The most commonly seen alternative NE is probably equally suitable, but a bit more expensive.

406773 useful and they are dirt-cheap. The WWW allows us to find what we need in short order, and the miracle of global distribution means that we can have it delivered within 48 hours almost wherever we live. Detector diodes have modern replacements, but power germaniums do not, and I have searched hard!