Re: Why JFET amp instead of Non-inv Op amp? Do they both not have high Imp?

Hello Stephen,

Why does it have to be a JFET? MOSFETs are more popular these days. My staple is the BSS123. That one is around 5c in large quantities.

If you use JFETs be careful, most don't have any sort of protection. I used a lot of BF245 JFETs when I was young. Just one healthy sneeze could send it to Lalaland if it wasn't in the circuit yet.

Regards, Joerg

http://www.analogconsultants.com
.

Relevant Pages

  • Re: Current regulator diodes
    ... > they are not that popular. ... That's an understatement. ... I can't remember the last ime I saw one in a ... JFETs can be connected gate to source and they become a current ...
    (sci.electronics.components)
  • Re: Operational Amplifier Design
    ... >> made with bipolar transistors, JFETS, MOSFETs, tubes, ... >> If you download the datasheet for an LT1028, ...
    (sci.electronics.design)
  • Re: Negative Feedback and the Criminal Assets Recovery Bureau
    ... MOSFETs are very linear, ... but the best is still not quite as good as the best BJTs. ... operate at high bias currents, ... JFETs are OK as low level devices, but possess such massively wide parameter ...
    (rec.audio.tubes)
  • Re: JFET on resistance?
    ... through 4 JFETS at any 1 time. ... MOSFETs will work, too. ... CMOS switches will probably provide soft switching if you ramp the ... some BS170s lying around so I'll do some work with them. ...
    (sci.electronics.basics)
  • Re: Why JFET amp instead of Non-inv Op amp? Do they both not have high Imp?
    ... > If you use JFETs be careful, most don't have any sort of protection. ... Just one healthy sneeze ... Are you sure that these were JFets and not MOSFets? ...
    (sci.electronics.design)