F5 Turbo Circuit Boards - Page 13

bear · 17th February 2012, 01:44 AM

Geez, my reading comprehension is down the tubes... heh.
You said not. Yikes.

nvm.

High slope transients are HF... that is the same as a high amplitude leading edge on a cannon, which has a LF component... annoying to think about. So just how much air should a tweeter move to result in a "realistic" reproduction? Heh.

_-_-bear

UKToecutter · 17th February 2012, 11:54 AM

Back home from working away.
I have done some more work on the layout and made it a bit more tidy.

Reading back through some posts during the last few days somebody was talking about possible alternatives for the MUR3020's in TO-220 packs.

Can I get confirmation if this is required and that the alternatives will be suitable for the F5. I should be able to provide for some alternate pads if needed.

Andy

jacco vermeulen · 17th February 2012, 12:24 PM

Example : STTH2002C (in standard TO-220 dress)
On fire sale for 42 $cents each at DK

UKToecutter · 12:42 PM

Quote:

Originally Posted by jacco vermeulen

Example : STTH2002C (in standard TO-220 dress)
On fire sale for 42 $cents each at DK

Looks reasonable but quite a bit slower than the MUR3020's.

Is that going to be an issue?

jacco vermeulen · 17th February 2012, 01:25 PM

Would you like the diodes to switch, or slide ?

Me regard the diodes as a torque converter in an automatic transmission, smooth gear change.

(slower ? really ?)

UKToecutter · 17th February 2012, 03:12 PM

Revised F5 v2/3 layout and PSU layout.
Very difficult to add TO-220 diode arrays without reducing track widths dramatically.

Horio · 17th February 2012, 03:42 PM

Looking great UKToecutter.

Maybe you were planning to do it at the end, but I don't see any mounting holes. I know the amp boards could probably be supported by the FET/Diode legs, but I'm a big fan of standoffs too.

UKToecutter · 17th February 2012, 04:12 PM

Quote:

Originally Posted by Horio

Looking great UKToecutter.

Maybe you were planning to do it at the end, but I don't see any mounting holes. I know the amp boards could probably be supported by the FET/Diode legs, but I'm a big fan of standoffs too.

I was thinking that the amplifier boards would be supported by the FET's being bolted to the heatsinks (I could put some mounting holes if people would like them).
I was planning to put mounting holes on the PSU.

In fact, I'll put them on now.....

lhquam · 17th February 2012, 04:20 PM

UKToecutter:

I really like your layout.

I do not understand many of the test-points. In particular why aren't there test-points for the measuring the bias current, ie. the voltage across the the source resistors? TP10 and TP5 appear to be connecteded to the same trace. Same with TP3 and TP9. What are TP1 and TP2? How are TP11 and TP8 used?

I do not understand why the (wide) traces from the diodes to the MOSFET source pins (and MOSFET side of the source resistors) need to be only on one side of the board. It might be better if the connection from the source-resistors to the MOSFET source pin was on both sides.

I am looking forward to using this board.

bobodioulasso · 17th February 2012, 04:29 PM

Input transistors including cascodes are very close to high output currents.
Might be an issue?

17th February 2012, 01:44 AM	#121
bear expert in tautology diyAudio Member Join Date: Apr 2002 Location: New York State USA	Geez, my reading comprehension is down the tubes... heh. You said not. Yikes. nvm. High slope transients are HF... that is the same as a high amplitude leading edge on a cannon, which has a LF component... annoying to think about. So just how much air should a tweeter move to result in a "realistic" reproduction? Heh. _-_-bear __________________ _-_-bear http://www.bearlabs.com [...2SJ74 Toshiba bogus asian parts - beware! ] -- Btw, I don't actually know anything, FYI --

17th February 2012, 12:24 PM	#123
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Example : STTH2002C (in standard TO-220 dress) On fire sale for 42 $cents each at DK __________________ Not so much,.......if it says "ZM" in the corner.

17th February 2012, 01:25 PM	#125
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, Rotterdam or Curaçao	Would you like the diodes to switch, or slide ? Me regard the diodes as a torque converter in an automatic transmission, smooth gear change. (slower ? really ?) __________________ Not so much,.......if it says "ZM" in the corner.

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17th February 2012, 11:54 AM	#122
UKToecutter diyAudio Member Join Date: Jan 2010 Location: Harrow, UK	Back home from working away. I have done some more work on the layout and made it a bit more tidy. Reading back through some posts during the last few days somebody was talking about possible alternatives for the MUR3020's in TO-220 packs. Can I get confirmation if this is required and that the alternatives will be suitable for the F5. I should be able to provide for some alternate pads if needed. Andy

17th February 2012, 03:12 PM	#126
UKToecutter diyAudio Member Join Date: Jan 2010 Location: Harrow, UK	Revised F5 v2/3 layout and PSU layout. Very difficult to add TO-220 diode arrays without reducing track widths dramatically.

17th February 2012, 03:42 PM	#127
Horio Newbie diyAudio Member Join Date: Mar 2010 Location: San Francisco	Looking great UKToecutter. Maybe you were planning to do it at the end, but I don't see any mounting holes. I know the amp boards could probably be supported by the FET/Diode legs, but I'm a big fan of standoffs too.

17th February 2012, 04:20 PM	#129
lhquam diyAudio Member Join Date: Mar 2010 Location: Olalla, Oregon: Land of the 100 Valleys	UKToecutter: I really like your layout. I do not understand many of the test-points. In particular why aren't there test-points for the measuring the bias current, ie. the voltage across the the source resistors? TP10 and TP5 appear to be connecteded to the same trace. Same with TP3 and TP9. What are TP1 and TP2? How are TP11 and TP8 used? I do not understand why the (wide) traces from the diodes to the MOSFET source pins (and MOSFET side of the source resistors) need to be only on one side of the board. It might be better if the connection from the source-resistors to the MOSFET source pin was on both sides. I am looking forward to using this board.

17th February 2012, 04:29 PM	#130
bobodioulasso diyAudio Member Join Date: May 2008	Input transistors including cascodes are very close to high output currents. Might be an issue?

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