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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Yes, a 3v3 family is not a drop-in replacement for a 5v part. You could pull roofing filters out of them, and crystals to convert from there to KHz, and complete KHz fm if strips. My understanding is that they have a reasonably good NF and they allow you to build a combination mixer-amplifier in a dataasheet device.

I used my time as a student as an example because it happened to be where I first saw an HC device.

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

OK, maybe germanium diodes are an edge case and the examples above have a radio flavour, but you get the picture. They contained significant excerpts from semiconductor data datasheett, and we read their wealth of information from cover to cover.

But in all fairness, still a dodo of a component. We knew by heart what each device was dtasheet of, and we eagerly devoured each new tidbit of information as it arrived. They are an elegant solution for what is needed. There were always two datashset. You had to buy the kit, or hope the author would supply the IC. I did a little searching — Dons site has a LOT of stuff! I thought is was diode, cathode, electrode, overload, generator, oscillator.


To that end you can find more than one manufacturer of these parts that seem to have an eternal need. 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. Just an example off the top of my head, nothing against AD parts in general: Thus an association was formed, when you want a quick logic function then 74HC is the modern one to go for.

So who knows, there might be a demand for them again! I think TI has it right and they recognized where they needed to be with things. Big paper-bound books the size of telephone directories were our only window into the exciting world of electronic components. There was a vast selection, but hobbyists used a small subset, because the hobby suppliers were easier to del with, as well as the ubiquitous Radio Shack.

If HC does your job then of course, use it. 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 datasheeet 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.

The 45 dB range 8 bits in voltage devices are dirt cheap and super common. I bought a few last-buys.


Those were big ones too. Get a 1N82 if you wanted better frequency response, thy were found in UHF tv tuners. All of your bases ARE belong to us. I used it a fair 4673. That thing is everywhere and not very many others can run off a single supply which the lm was famous for. Dafasheet needed to know what was going on in the circuit, and the general specs of the semiconductors.

Of course, if you know of a good candidate for replacing theplease share the details. 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 datasueet the bag-full from the usual Asian suppliers.

Datasheet, PDF – Alldatasheet

Even inI went through an RCA price list and found one that was cheaper, I guess it was the 4N, something like that. Balanced mixers had advantage. How times have changed. I personally do not understand why this part did not take off other than it is so dog gone hard to understand how they should work!

I actually try to use as few different components as possible, to reduce storage requirements and simplify design. Ahh, you can help me with building my quasi nuclear phase locked loop synthesized equalizer. Germanium point-contact diodes, for example.