Re: 2N2/40 PA Heatsinks

---------

From: Tayloe Dan-P26412 (Dan_Tayloe-P26412@email.mot.com)
Date: Tue Jul 27 1999 - 13:24:37 EDT


I guess that I have used plastic transistors as output finals, not
Metal. I usually get over a watt out of a set of 3 cheap ($0.10 each),
commonly available 2n4401 transistors.

- Dan

-----Original Message-----
From: Arjen Raateland [mailto:Arjen.Raateland@vyh.fi]
Sent: Tuesday, July 27, 1999 8:47 AM
To: Dan Tayloe-P26412
Cc: Low Power Amateur Radio Discussion
Subject: Re: FW: Re: 2N2/40 PA Heatsinks

Tayloe Dan-P26412 wrote:
>
> > -----Original Message-----
> > From: Tayloe Dan-P26412
> > Sent: Tuesday, July 27, 1999 8:32 AM
> > To: 'qrpl'
> > Subject: Re: 2N2/40 PA Heatsinks
> >
> > -----Original Message-----
> > From: Alex Mendelsohn <ai2q@ispchannel.com>
> >
> >
> > >Now, does anyone have any good ideas for homebrew heatsinks for the
> > 2N2/40's
> > >PA XSTRs?
> >
> > I forget the size, but there is brass tubing (available from hobby
shops)
> > that produce a tight fit for most plastic transistors. I usually solder
> > a small section to the double sided PC board surface and epoxy the
> > transistor
> > inside.
> >
> > Seems to work quite well!
> >
> > - Dan Tayloe, N7VE; Phoenix, Az; Az ScQRPions; QRPL # 696

Aren't the 2N2222's in the TX final supposed to be the TO-18 ones?

Their metal case is connected to the collector, so you'd have a bunch of
nice shorts if you solder the heatsinks to the PCB ground plane.

73,

-- 
Arjen Raateland
Finnish Environment Institute
SAS Support
phone +358 9 4030 0350


Search QRP-L Archives

[ QRP-L Archive | ]
[ 1993 | 1994 | 1995 | 1996 | 1997 | 1998 | 1999 | 2000 ]

---------

This archive was generated by hypermail 2b29 on Fri Jun 02 2000 - 11:41:45 EDT

kd4ab@kd4ab.org