PCS Electronics PCS Electronics - home page PCS Electronics  
RegisterSearchFAQAM & FM Radio transmitters shop UsergroupsLog in
28V 40A PSU

 
Reply to topic    PCS-Electronics Forum Index » Schematics - help and ideas View previous topic
View next topic
28V 40A PSU
Author Message
Yoda
Regular poster
Regular poster


Joined: 03 Dec 2003
Posts: 20
Location: The swamps of Dagobah

Post 28V 40A PSU Reply with quote
I recently obtained a 330watt linear FM amp to use with my transmitter. I need to build a 28V psu to run at about 40A in order to power my amp. I have thought of using multiple 2n3055 transistors to regulate the output, but I am finding it hard to find a circuit for the PSU.
Anyone any ideas (or circuits) where I might get a circuit or schematic for the PSU??


_________________
I have removed my e-mail address due to spam through this forum!!! please now use:
simon (at) dreamtechnologies (dot) co (dot) uk

May the force be with you.

http://www.radiorave.co.uk/
Sat Dec 20, 2003 4:50 pm View user's profile Send private message Visit poster's website
Recon Blazer
New registered user
New registered user


Joined: 17 Jan 2004
Posts: 16
Location: My laboratory

Post Reply with quote
OH MY GOD!!! I love your account and profile! No, may the Force be with YOU.

WHere do you obtain transmitters?
Sat Jan 17, 2004 7:46 am View user's profile Send private message AIM Address
pcs
Site master
Site master


Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
I've seen similar designs in this book:

http://www.amazon.com/exec/obidos/ASIN/0872591921/mightyspiraterad

This is one of my favourite books, I've probably opened it at least
1000 times for various tips, ideas, theory, practical designs....
Its The Holy Bible of radio electronics.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Sat Jan 17, 2004 6:34 pm View user's profile Send private message Visit poster's website
Fleetinglimpse
Compulsive poster:)
Compulsive poster:)


Joined: 26 Oct 2003
Posts: 142
Location: Heavens Above

Post Re: 28V 40A PSU Reply with quote
Yoda wrote:
I recently obtained a 330watt linear FM amp to use with my transmitter. I need to build a 28V psu to run at about 40A in order to power my amp. I have thought of using multiple 2n3055 transistors to regulate the output, but I am finding it hard to find a circuit for the PSU.
Anyone any ideas (or circuits) where I might get a circuit or schematic for the PSU??


Greetings,
First of all if you need 40AMPS to get 330WATTS out of an RF amp..then you have the most inefficient cct. design available..Any Amp that is available for a 28 Volt feed should never draw more than 10-12 amps maximum..However it is good to have a 40 Amp reserve.

However if you are really interested in learning and not being stupid or wantonly naive ABOUT RF AMPS AND THE MANNER IN WHICH THEY ARE POWERED YOU may wanna go to http://groups.yahoo.com/group/pirate-radio/files/MRF141G_ARF313%20RF%20AMPS Where i have preapred a series of articles hopefully that will be of of help to you and others in educateing yourselves...Obviously you seem to know enough to ask a question but one can detect an element of stupidity in the manner in which you have worded or been scripted to word your question.
Respects...Norm B
Mon Jan 19, 2004 8:42 am View user's profile Send private message
pcs
Site master
Site master


Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
Not entirely so. You need at least 330W, if the efficiency is 100%, which
is 330W/28V = 11.78A

Of course there is no such thing as a 100% efficient amp.
In reality it will be closer to 65% or so. Which means about 18A.

20A power supply should be enough. If you want to play it really safe,
use 25A. Absolutely no need for more amperage.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Mon Jan 19, 2004 3:36 pm View user's profile Send private message Visit poster's website
Display posts from previous:    
Reply to topic    PCS-Electronics Forum Index » Schematics - help and ideas All times are GMT + 1 Hour
Page 1 of 1

 
Jump to: 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group