The AM Forum
March 29, 2024, 02:38:40 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: [1]   Go Down
  Print  
Author Topic: A Suggested LV Supply for Clark's 4X4  (Read 2448 times)
0 Members and 1 Guest are viewing this topic.
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
*
Offline Offline

Posts: 1768


« on: April 20, 2018, 04:56:09 PM »

In order to offload some of the current from the HV B+ supply here is a suggested separate LV Supply for Clark's 6146 4X4 system.

The Voltage Divider would be energized from the same Keying relay that energizes the HV B+ transformer but on separate contacts.

That way, he can use the 50K 100W resistor as solely the bleed resistor for the 600 Volt supply and not have to worry about multiple taps on it:


Phil



  

* 4X4 LV Power Supply.pdf (85.32 KB - downloaded 150 times.)
Logged

Charlie Eppes: Dad would be so happy if we married a doctor.
Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse.NUMB3RS   Smiley
N1BCG
Member

Offline Offline

Posts: 836


« Reply #1 on: April 20, 2018, 05:20:10 PM »

Wow, thanks, Phil!  I hadn't expected to see a dedicated thread for this!

I was able to get along with just one tap from the main bleeder (50k/100W) by setting it for the driver plate supply then adding a resistor from there for the screens with a regulator tube.  Seems to work, but disaster struck (see original thread for details).
Logged
N1BCG
Member

Offline Offline

Posts: 836


« Reply #2 on: April 21, 2018, 11:58:11 AM »

Actually, I may have an even better option. The power transformer HV secondary has an unused CT (full wave bridge) so there’s a nice 300V source.
Logged
KA2DZT
Member

Offline Offline

Posts: 2192


« Reply #3 on: April 21, 2018, 01:39:25 PM »

Very good idea.  You would still need a LC filter off the CT.
Logged
DMOD
AC0OB - A Place where Thermionic Emitters Rule!
Contributing
Member
*
Offline Offline

Posts: 1768


« Reply #4 on: April 21, 2018, 03:57:28 PM »

Actually, I may have an even better option. The power transformer HV secondary has an unused CT (full wave bridge) so there’s a nice 300V source.

Cool. I have a number of 150 mA chokes if you need them.
Logged

Charlie Eppes: Dad would be so happy if we married a doctor.
Don Eppes: Yeah, well, Dad would be happy if I married someone with a pulse.NUMB3RS   Smiley
N1BCG
Member

Offline Offline

Posts: 836


« Reply #5 on: April 22, 2018, 10:38:41 AM »

Thanks, Phil! That's very kind. I fabricated and tested this solution which seems to work very well...


* IMG_7786.JPG (1831.92 KB, 4032x3024 - viewed 228 times.)
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.096 seconds with 19 queries.