Electronics > Beginners

Recommended MOSFETs, JFETs

<< < (2/2)

qu1j0t3:

--- Quote from: T3sl4co1l on December 27, 2018, 12:34:42 am ---JFETs aren't fundamentally different; they are selected based on testing. …
There are very few JFETs that you actually need/want, and this is reflected in the ever-shrinking market.  They're great parts when you need them, it's just very rare that you do. :-\

Tim

--- End quote ---

Thanks Tim. I'll also accept recommendations for suitable MOSFETs (P/N) for amplifier/follower, to keep in stock.

T3sl4co1l:
There was another more recent thread about that too:
https://www.eevblog.com/forum/beginners/jellybean-hobbyist-general-purpose-transistors/msg1322846/

Tim

Zero999:
Yes discrete J-FETs are rarely used these days and the same goes for low power MOSFETs.

For a voltage follower, just use an op-amp. It can be a J-FET input op-amp, such as the TL072, if you want a high input impedance.

MOSFETs are normally used for switching large currents, either on or off, rather than in the linear region.

If you want 10 or so N and P channel J-FETs for experiments, just order whatever you can get in a through hole package of, from a widely known distributor: Digikey, Mouser, Farnell etc.

Kleinstein:
p-Channel JFETs are very rarely used. So here it's about looking what is available, if one really needs one.

n-Channel JFETs are still used sometimes, but not very often. THT parts are getting rare, but there are still eve new SMD parts.
So if it needs to be THT the choice is usually limited.

The variation in the parameters is quite large. So most circuits that use JFETs are not very picky about the exact type. It is mainly for high performance that the type of JFET matters. With JFETs in TO18  some, made for switching have the gate at the case. This can be a bit odd when used in an amplifier.

Wolfgang:
For grounded gate RF amps, gate at the grounded case is ideal. This reduces unwanted feedback capacitance.

Navigation

[0] Message Index

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod