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Old 23rd January 2009, 09:17 AM   #711
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HI Salas

Is important to put the jfet face to face for a sort of thermal traking...???
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Old 23rd January 2009, 10:16 AM   #712
AndrewT is online now AndrewT  Scotland
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If you want thermal tracking then instant glue the faces together and bind around the pair with three turns of thick copper wire.

I recommend that all pairs of transistors in LTPs and Mirrors be thermally coupled and that care is taken to ensure each half of the pair pass identical currents.
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Old 23rd January 2009, 12:00 PM   #713
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Default Re: Layouts

Quote:
Originally posted by enzedone
ikoflexer,
Is it possible you can save those two layouts you have done in bitmap and post them up. Then I can just go over them removing the parts and print the tracks off with my laser printer and iron them on to the boards.
Brett
Brett, I can post bitmap files, sure, but I found it looses size information when printing. Nevertheless, I'll post those files a little later.

guys, about the thermal tracking, do you mean J1 from left and right channel be bound together, J2 from L and R channel be bound together, etc.? Do you really think it's worth the pcb yoga to accomplish this?
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Old 23rd January 2009, 02:51 PM   #714
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How about pdf? The thing to be careful about when printing the image, is that there is no shrinking of the image, or otherwise fitting it to the page in any way. The size should be left like that.

Edit: I deleted the wrongly attached file.
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Old 23rd January 2009, 02:54 PM   #715
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Here's the silkscreen.
Attached Files
File Type: pdf salas4silkscreen.pdf (13.0 KB, 145 views)
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Old 23rd January 2009, 02:57 PM   #716
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Oops, sorry, I printed the bottom layer of the pcb as a mirror image by mistake. Here's the correct one.
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File Type: pdf salas4bottom.pdf (9.9 KB, 141 views)
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Old 23rd January 2009, 03:03 PM   #717
Salas is offline Salas  Greece
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Quote:
Originally posted by nicoch46
HI Salas

Is important to put the jfet face to face for a sort of thermal traking...???
Not in our phono. There is no dif amp.
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Old 23rd January 2009, 03:05 PM   #718
Salas is offline Salas  Greece
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Quote:
Originally posted by ikoflexer
Here's the silkscreen.
Bravo Iko! Good sharing work!

P.S. There is already a 46dB version based on that schematic posted for high out MC 1mV for RCruz back in the thread. If someone needs another gain, let me know.
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Old 23rd January 2009, 05:53 PM   #719
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Default Cheers

ikoflexer

Sweeeeeeeeeeeet as,

I'll print these off and see which one measures up correctly
Thanks for putting the 1cm on.

Brett.
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Old 23rd January 2009, 07:26 PM   #720
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Quote:
Originally posted by salas

P.S. There is already a 46dB version based on that schematic posted for high out MC 1mV for RCruz back in the thread. If someone needs another gain, let me know.
Probably the same pcb can be used, just with different part values?
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