[GreenKeys] 120vdc at 4-5 amps?

[hwhall at compuserve.com]

That sounds like the ticket!  :-)

 

 Wayne
WB4OGM

 

-----Original Message-----
From: drlegendre <drlegendre at gmail.com>
To: Wayne Hall <hwhall at compuserve.com>
Cc: ksweek <ksweek at mindspring.com>; Green Keys <GreenKeys at mailman.qth.net>
Sent: Tue, May 1, 2018 7:51 pm
Subject: Re: [GreenKeys] 120vdc at 4-5 amps?



Not sure if it's already been mentioned, but you could use a 12V 4-5A transformer to buck-off the extra voltage at the output or input of a 120:120 isolation transformer. Bucked down to 108V, rectified and filtered, you should end up just about where you want to be.


On Tue, May 1, 2018 at 8:19 PM,  <hwhall at compuserve.com> wrote:

Couple ideas:
1.  Start out with the isolation transformer idea, find out what the final DC output is when rectified & filtered, cut into the transformer & take off some turns.  
2.  Make the above power supply but feed it with a variac instead of cutting up the isolation transformer.

 

 Wayne
WB4OGM

 


-----Original Message-----
From: ken Schwieker <ksweek at mindspring.com>
To: GreenKeys <GreenKeys at mailman.qth.net>
Sent: Tue, May 1, 2018 6:25 pm
Subject: Re: [GreenKeys] 120vdc at 4-5 amps?


If you use an isolation transformer you will end up with considerablymore than 120 volts dc after rectifying and filtering. One possiblesolution is to get a variac, remove all the center hardware
and wind enough turns of insulated wire for the secondary to produce theneeded voltage.
Ken S 

At 11:13 AM 5/1/2018, you wrote:

No, I don't need to run 100loops at once. I have several pieces of gear with 120vdc motors and itwould be nice not to have to plug/unplug them one at a time on my 1Asupply.
Any suggestions about where to find a suitable transformer? -Â Diodes and caps are no problem. I'll keep an eye out at the Daytonhamfest.

Nick England K4NYW
www.navy-radio.com


	
        
		
Virus-free. www.avg.com		
	

 



______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html




-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20180501/94646893/attachment.html>