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Old 14th October 2012, 08:26 PM   #7111
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Not sure what area it is, but check this out
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Old 14th October 2012, 08:32 PM   #7112
alex mm is offline alex mm  Europe
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....... have omited two connection,first from positiv fuse to colector OT, and second from negativ fuse to colector OT will not work ........ see picture
Alex.
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Old 14th October 2012, 09:08 PM   #7113
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Default Thank you Alex... sadly this amplifier was not approved

But this remote output, we can use with several amplifiers, will be alway usefull.

Also thank you by your kindness Juan.

I am playing with that non approved prototype.... using filters and playing with it...soon i will upload a video...a bad quality video but shows the unit working.

http://www.youtube.com/watch?v=TqJWYTNA6KM

regards,

Carlos
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Last edited by destroyer X; 14th October 2012 at 09:12 PM.
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Old 15th October 2012, 02:36 AM   #7114
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Don't mind the not connected fuses the prototype was not approved dear Alex that is why I is not completed, and I just want it to show where did I stop the layout.


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Old 15th October 2012, 07:10 AM   #7115
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Default Juan. here you have the circuit i am using to "play with bass"

That is the subject of this small movie here:

Playing with bass - YouTube

If you want to make it, or to produce a layout...then i am posting the schematic.

regards,

Carlos
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Old 15th October 2012, 07:18 AM   #7116
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Default Herman is having fun with uncle charlie.... he sent me this picture

Crab is an animal that walks backwards...this means he do not advance to the future..he return to the past...and Dx amplifier is past...old amplifier already made.

Hehehehehe...he is right.... does not make sense to go "forward to the past" nor back to the future.

regards,

Carlos
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Old 15th October 2012, 08:13 AM   #7117
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Default Returning from job in the afternoon i will continue to play

Will try to modify the bass slope.

regards,

Carlos
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File Type: jpg AC analisis.jpg (44.0 KB, 118 views)

Last edited by destroyer X; 15th October 2012 at 08:17 AM.
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Old 15th October 2012, 10:57 AM   #7118
AndrewT is online now AndrewT  Scotland
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Quote:
Originally Posted by vargasmongo3435 View Post
........................ the center tap is already connected to the center of the board, the red is the top side of the board and the blue one the bottom but if I'm wrong I will check it again, when you refer to "narrow" is the blue one or the red one that has to be change it to avoid the pulses?................
move the centre tap connection the space right next to the rectifier.
Remember the charging pulses run around the circuit from secondary/rectifier/first+ve cap/centretap/secondary/rectifier/first-ve cap/centre tap and repeats on every cycle. You don't want the traces carrying these pulses (in a figure of 8) to be shared with any circuit downstream of the charging circuit.

Look at the area between the first 4 smoothing caps.
There is a very wide Zero volts trace running from left to right through that space. Narrow the trace to maybe 5mm wide. This will help keep the charging pulses to the left side of the narrowing. Then the Zero volts side to the right of the narrowing will have much less of the charging pulses imposed on it. That should help "clean up" the output side of the PSU.
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Old 15th October 2012, 11:10 AM   #7119
AndrewT is online now AndrewT  Scotland
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V,
the +ve rail trace and the -ve rail trace connecting all the like poles of the smoothing capacitors can be improved.
Break the +ve trace between the first cap and the second. Break the +ve trace between the second cap and the third cap.
repeat this for the -ve side traces. And repeat on top and bottom sides.
Insert pads to allow shorting links to be soldered in to maintain trace continuity from transformer end to the output end.

Now the OPTIONAL improvement:
replace the first +ve link and the first -ve link with radial resistor that fits the little gap at the edge of the PCB.
This changes the PSU from rCCC to rCRCC.
The second OPTIONAL improvement:
replace the second +ve link and the second -ve link with radial resistor that fits the little gap at the edge of the PCB.
This changes the PSU from rCRCC to rCRCRC.

The R can be any value dependant on current demand. I'd suggest the quiescent Vdrop across the first resistor be <300mVdc and across the second resistor <100mVdc.

You can replace these resistors with air cored handwound inductors with a R value (the copper wire resistance) ~ = the the R value that gave those same voltage drops I suggested above.

For a little amplifier say ~100W (Iq~100mA) the resistors could be 0r33 (1st) and 0r22 (2nd)
for a big amp say 300W (Iq~600mA), the resistors could be reduced to ~ 0r22 & ~ 0r1
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Old 15th October 2012, 06:52 PM   #7120
endia is offline endia  Turkey
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Hi Carlos and hi all,

i designed this pcb from your schematic;
Greg's Web Site
and inspired from this pcb design;
TO-3 SYMASYM

just want to be sure before etching if it has any error or fine to go?
thanks..
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Last edited by endia; 15th October 2012 at 07:03 PM.
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