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 used my time as a student as an example because it happened to be where I first saw an HC device.
Balanced mixers had advantage. 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 was germanium and needed germanium, but that small 46073 signal bipolar transistor in an audio darasheet 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.
40673 MOSFET. Datasheet pdf. Equivalent
They wanted to use what they had, or what they could scrounge. Cordless phones have moved up in frequency, and are using larger scale integration, a lot less useful for reusing the parts.
It would be nice to make such a simple choice but in reality there are many times that you have to support 5 Volt systems. The window for scrounging is closing. Manufacturer names and part numbers would be better. Which exactly are the datashheet that have superseded the 74HC?
Not perfect, but acceptable for a lot of uses. If I specify a transistor with a low price and an equivalent substitute I can be sure that my employer will be able to buy that part well into the future. The most expensive single chip I use today is the AD Email required Address never made public. Skyworks do detector diodes that are much better than the old germanium ones.
As a non-professional hobbyist, the issue comes from the specification and the tools we are given to datawheet. And people wonder why I hoard old analogue TV tuners. Hang on, this is Hackaday.
Datasheet, PDF – Alldatasheet
Really great UHF front end datasneet. Notify me of new comments via email. The same thing happened when AD acquired Burr Brown. 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.
A Understand the actual requirements for the circuit which 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.
This site uses Akismet to reduce spam. The second gate also made it easy to control the gain when used as an RF amplifier.
I bought a few last-buys. That thing is everywhere and not very many others can run off a single supply which the lm was famous for.
The most commonly seen alternative NE is probably equally suitable, but a bit more expensive. Is there even the vaguest hope of something like that for FPGAs? Epoxy-blobs, I tell you! Thus an association was formed, when you want a quick logic function then 74HC is the modern one to go for.
Fill in your details below or click an icon to log in: But there do appear to be some parts that I would try to sub for the in an old receiver design: 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 datasheet modern process inside, datsaheet to the hobbyist.
Those people probably bought the kit if it was available.