Re: Ramsey Amps?

---------

From: W. Daniel, 9V1ZV (daniel@pandora.lugs.po.my)
Date: Fri Aug 18 1995 - 20:59:38 EDT


On Sun, 20 Aug 95 15:01:37 MDT, "Richard G. Kellner" <kellner@usa.acsys.com> wrote:
> Thanks for the suggestions, Daniel. You wouldn't happen to have the
> layout in a form you could send to me, would you? Did you change

What format do you want the layout in? The mounting is slightly different
for the MTP3055E's as part of my design was to allow attachment to a much
larger heatsink. I used a shareware PCB designer to do the job so I can send
that PCB file to you (Protel's format). Only think is that I do not know if
the component layout will be clear due to the rather compact component
placement. I also change some resistor types to 1/2 watt from 1/4 (the low
value resistors) because some had burnt out earlier. The biasing really
needs looking into however.

> the input and output transformers at all, or were they OK? Thanks

I tried a design with the original transformers which were mostly okay but
it seemed to overheat quite badly so I change the output transformer to a
shorter but bulkier one. This one is square in shape so it looks nicer on
the PCB. I was trying to make the whole thing small enough to put into one
of my existing rigs but the heat made the whole thing quite difficult to do.

> again and 73,
> de Rich W5RXP

Let me know what you need and I'll see what I can do about it.

73 de 9V1ZV Daniel

-- 
 Daniel Wee | daniel@pandora.lugs.po.my
 9V1ZV      | daniel.wee@f516.n600.z6.fidonet.org


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 - 11:28:27 EDT

kd4ab@kd4ab.org