Re: IRF510 sale
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I have some stock of darlingtons and wonder if there are any such transistors that can sub for the FETs because of the higher gain? Will the 3904s be able to drive a darlington with its much higher gain or would it require some kind of matching system? I believe using FETs eliminate much of the matching and drive attention but some here may know the answer to this better than I can guess. Bob ¡ª KK5R
On Friday, January 1, 2021, 12:58:37 PM EST, Jerry Gaffke via groups.io <jgaffke@...> wrote:
Here's an excellent post from Allison regarding the use of IRF510's vs the RD16HHF: ? ??/g/BITX20/message/53765 The IRF510's can work fine up through 30mhz. At 50mhz I'd go with something better, but Allison finds a way. Power from the 16db 2n3904 based driver stages falls off as the frequency goes up. That may well be more of a factor than the IRF510's in your "much less on the higher bands". Jerry, KE7ER On Fri, Jan 1, 2021 at 09:13 AM, Howard Fidel wrote: I have 19V and on 40 meters, about 20 watts. Much less on the higher bands. The IRF510 is a poor choice for higher power and higher frequencies, it is slew rate limited. |
Bob Lunsford