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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Extremely useful and they are dirt-cheap. Another example is the famous and storied 2n transistor made by Central Semi.

_PDF Datasheet Download IC-ON-LINE

People probably specify old components because. Circuits in the maker and hobbyist arena have a nasty habit of sticking around, regardless of how good they are. We therefore tend to stick with the devices and components we know, regardless of their cost or of whether they have been superseded, and our work is poorer for it. Redesigning to remove obsolescent components means going back through FAA certification. These publications were our only window into the world of electronic components.

datashwet Zombie components are alive and well in the aviation world. But in all fairness, still a dodo of a component. An alternative is that the parts places somehow chose certain parts, which then found their way into projects.

NTE Equivalent NTE MOSFET N-CHANNEL DUAL – Wholesale Electronics

I actually try to use as few different components as possible, to reduce storage requirements and simplify design. Circabipolar transistors also had improved noise figure. The most commonly seen alternative NE is probably equally suitable, but a bit more expensive. The window for scrounging is closing. As a fresh-faced electronic engineering student while the first Gulf War was 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.

I use a as a mixer as it happens, and in my application you start to hear the performance tail off somewhere above 10MHz with the HC part. 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. There were always two camps.

I am guilty of rarely using op amps, and replace them with transistors whenever possible: So that may no longer be a source, especially if you want leads. Another example would be lm Great article all the datashfet. They wanted to use what they had, or what they could scrounge.

Rochester electronics is one such place that will supply parts albeit expensively until the cows come home. Information rich and knowledge poor is probably going to be the biggest obstacle in the next few generations. This is probably leftover from xatasheet war years: Some FM broadcast band tuners used them, so maybe car radios are a source. 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.

Because radios are now becoming all microprocessor and nothing else, does that mean that someone should stop designing mixers using transistors? Make a circuit with me. Now all this said there is perhaps a different case for the ol TL and the likes but still they are cheap. Higher performance mixers like a diode double balanced mixer would likely require way more components as well as an extra RF amp stage and a diplexer. OK, maybe germanium diodes are an edge case and the examples above have a radio flavour, but you get the picture.

Email required Address never made public. Notify me of new posts via email. Even inI went through an RCA price list and found one that was cheaper, I guess it was the 4N, something like that.

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

But who knows when someone will quietly bring them forth again. Conversely, making inverters cheaper actually has a huge effect on the market.

Epoxy-blobs, I tell you! Get a 1N82 if you wanted better frequency response, thy were found in UHF tv tuners.

Balanced mixers had advantage. 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. It worked well, but as you might expect better devices came along, and daatasheet was withdrawn some time in the s.