Call Search
     

New to Ham Radio?
My Profile

Community
Articles
Forums
News
Reviews
Friends Remembered
Strays
Survey Question

Operating
Contesting
DX Cluster Spots
Propagation

Resources
Calendar
Classifieds
Ham Exams
Ham Links
List Archives
News Articles
Product Reviews
QSL Managers

Site Info
eHam Help (FAQ)
Support the site
The eHam Team
Advertising Info
Vision Statement
About eHam.net

   Home   Help Search  
Pages: [1]   Go Down
  Print  
Author Topic: Powe supply for tubes  (Read 490 times)
KB3NOV
Member

Posts: 57




Ignore
« on: December 02, 2006, 07:34:01 PM »

Hi,
    I have not found a circuit like this and would like to know is theres anything wrong with my idea.

Picture a transformer with a FWB rectifier.
Now a C-L-C section. Next another SEPERATE L-C section
from the rectifier. The C-L-C would be TX power and the L-C section with a higher HY and lower MA rating to lower the output voltage for the RX. The TX would be QRP or 10W or so. Not high power. I also would use a circuit I found using a LR8N and a pass transistor to regulate screen voltage.

                            Thanks and 73,

                              Jennifer / KB3NOV
Logged
HA5RXZ
Member

Posts: 380




Ignore
« Reply #1 on: December 05, 2006, 04:40:13 AM »

Sounds OK but I think you might be going the long way round.

HT supplies for tubes used to use big series chokes because the HV condensers were only available in low values. Typically you would see a 5H series choke with some paper capacitors either side to chassis. The whole thing formed a low-pass filter which would not let mains hum through.

We now have some great high voltage capacitors available and that big choke is no longer needed. A quick glance at my Mouser catalog shows values up to 450 volt 3,300uF. Hook one of these across your full wave rectifier and it would probably do the job.

HA5RXZ
Logged
KB3NOV
Member

Posts: 57




Ignore
« Reply #2 on: December 06, 2006, 05:25:33 PM »

Hi,
   Thanks for the answer. I have decided to go with a single filter section, instead of two seperate. I found on the web a site  DUNCAN AMPS. There is a free program called  PSUDII. It is to figure power supplys.
I found a supply on a web site that the person is knowledgable, and put in their parts specs. The program
was VERY close to what they said it would put out.

The program is nice. Find out before buying the wrong parts. I ran a simulation using a CLC 47uf-5hy-450uf
filter section. It had ripple, and really stressed out the parts on start up. I have decided on clclc.
47uf - 5hy - 47uf - 5hy - 47uf. The loading on parts much less, and the ripple...what ripple Smiley.

This program is really neat. Shows a lot. And at a price any cheap ham is looking for...FREE Smiley.

                      73,

                     Jennifer

Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.11 | SMF © 2006-2009, Simple Machines LLC Valid XHTML 1.0! Valid CSS!