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Old 14th March 2013, 01:35 AM   #81
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Default Dx Supply performance...or Ampex supply performance...

... is awesome for an analogic supply.... linear power supply.

10 Vpp of ripple in the rectifier filters was reduced to 60 mVpp in the regulator output...this is very good

Voltage drop at 250 watts is 0.3%

See the video.... very nice... i am happy i have selected this circuit down the seventies and i am using it since that date.

https://www.youtube.com/watch?featur...&v=tUURBkVgmqI

regards,

Carlos
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Old 16th March 2013, 09:54 AM   #82
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Default Build the Dx Supply, an Ampex vintage

linear supply tweaked by uncle charlie and used since the seventies.... 3 dozen made and some still used with Radio Amateurs...no complaints against this units ..... 41 years of reliability.

regards,

Carlos
Attached Images
File Type: jpg DSCI1958.jpg (1,018.5 KB, 417 views)
File Type: jpg DSCI1963.JPG (839.4 KB, 369 views)
File Type: jpg DSCI1959.JPG (320.5 KB, 322 views)
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Old 16th March 2013, 03:19 PM   #83
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Default Ugly but ready and tested

Heatsinks will be replaced by much bigger ones...these are there only for testing purposes.

regards,

Carlos
Attached Images
File Type: jpg DSCI1969.JPG (726.1 KB, 313 views)
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Old 23rd March 2013, 07:40 PM   #84
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Default Insulator to be used in my Dx Supply, the old layout

We are preparing a better and new layout that soon gonna be published.

regards,

Carlos

Dx Supply wooden insulator, isolador de madeira para fonte Dx - YouTube
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Old 25th March 2013, 10:55 PM   #85
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Default As i have promissed..the updated Dx Supply layout

is here.

Was not tested...not assembled...this means can have error.

Carlos
Attached Files
File Type: pdf hot iron.pdf (23.4 KB, 80 views)
File Type: pdf light sensitive.pdf (23.5 KB, 59 views)
File Type: pdf size mesurements.pdf (59.9 KB, 79 views)
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Old 25th March 2013, 11:00 PM   #86
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Default Here you have the Dx Supply image

Now it can hold the load of 2 power amplifiers, operating full power at 2 ohms loads.

But your input voltage must be 46 to 48 volts and you must adjust the output to 42 volts using proper heatsinks to the supply.

I have published long text explaining these details .

regards,

Carlos
Attached Images
File Type: jpg size mesurements small.jpg (808.3 KB, 302 views)
File Type: jpg New layout schematic.jpg (657.3 KB, 217 views)
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Old 26th March 2013, 07:12 AM   #87
wiljj78 is offline wiljj78  Philippines
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Quote:
Originally Posted by destroyer X View Post
Now it can hold the load of 2 power amplifiers, operating full power at 2 ohms loads.

But your input voltage must be 46 to 48 volts and you must adjust the output to 42 volts using proper heatsinks to the supply.

I have published long text explaining these details .

regards,

Carlos
This is Great! Many Thanks Uncle Charlie.... You and Juan are the best here in DIY!

My dear Juan, Please post buttom view for hot iron in JPG. file as i have 6mm short on actual printout of your pdf file, this time i can use your layout because multi turn trimmer's are not on board, this is the parts that i cannot find in my place.

Have a nice day to both of you....

Take care,
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Old 26th March 2013, 08:07 AM   #88
Luke is offline Luke  New Zealand
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Hi Carlos, nice supply. Just wondering 35-40mm standard snap fit caps are a good choice for your pcb. If you look on the forum, there are many people using and selling these. They are almost a universal standard.
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Old 26th March 2013, 08:24 AM   #89
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Default There's a mistake in this layout that Juan have not fixed

Zimmer informed the error remain there.

Please, do not assemble the last pcboard published in thread above till i post the fixed layout.

The schematic shows two output pair, in the reality we are using three, this is a matter to include on more only.

Soon we gonna have this fixed.

sorry folks!

Carlos

.................................................. .......................................

Capacitor diameter was a hard decision to take.... we had the need to reduce the pcboard size, in order to allow folks to use more than one supply..because of that we have decided by smaller capacitors.

I will inform layout designers..if they want to make the layout again to increase these capacitors diameter i will let them do.
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Last edited by destroyer X; 26th March 2013 at 08:28 AM.
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Old 26th March 2013, 08:31 PM   #90
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Default We are fixing the layout and making upgrade in the supply

Some parts are included or i have changed the value.

Coils are two layers, each layer may have 12 to 15 turns, wire is 0.5 to 1 milimeter diameter... total turns from 24 to 30 turns... resistor will be the core, as 3.3 ohms resistor, a 5 watts unit.

regards,

Carlos
Attached Images
File Type: jpg Dx Supply upgrade parts modified.jpg (296.3 KB, 190 views)
File Type: jpg Dx Supply upgrade.jpg (257.1 KB, 156 views)
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Last edited by destroyer X; 26th March 2013 at 08:39 PM.
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