F5 power amplifier - Page 182

hc167 · 22nd September 2008, 10:36 PM

point to point is good too. I just want to be as professional as possible. Well, maybe I should re-think about it. plus point to point is almost always cheaper.

Ed LaFontaine · 22nd September 2008, 10:49 PM

hc167,

You could do a lot worse than check here for parts:

The Company Store

Take care that he has had his morning coffee 1st

jameshillj · 23rd September 2008, 10:30 AM

Can get the 'vero' board everywhere - the fibreglas board with all the holes and no copper - perfectly good option to pcb and often better.

hc167 · 23rd September 2008, 06:49 PM

this is what I am thinking now. actually, I may consider using only one broad for both channels. that way I can reduce the amount of cable from power supply to the broad, and that end up having better physical component arrangement in the amp (If I do everything right). Since F5 has simple circuit design, I think point to point is good way of build it.

khaho · 23rd September 2008, 07:05 PM

I am quite a newbie, but I see two problems in one board for both channels:

1) the current needed from PSU is doubled with less wires and thats quite demanding for full power of F5 (this could make channel separation worse at high power)

2) cooling arrangement is worse, you need really big one heatsink or the board must be between heatsinks, making the size of the board quite fixed for a case of some size (you should not have long wires to gates of the mosfets, or gate resistors should at least be near the mosfets)

hc167 · 23rd September 2008, 07:25 PM

Thanks a lot for your comments. Well, first, the current will depend on how you arrange your component on the broad and the wire that you use. So I do not think I will worry too much about it. Second, I said I will use one broad, but I never said I will mount the power devices on the broad. In stead, I think the device should mount on the heatsink directly and separate from the broad. The reason why I think this way is I build a Aleph 30 before and from my experience, problem with power device on one broad is the broad will get hot too. Especially we are building a class A amp. So I want to let all the component as cool as possible. I guess the best way to do is not to mount the device on the broad. yes, it is little more work. but I think that is ok. plus I am not good at drilling hole on heat sink. so good thing about this design is I only need to drill and tap two holes for each channel. drilling holes on heat sink and then tap is just too painful for me.

hc167 · 24th September 2008, 06:05 AM

oh, by the way, Mr. Pass, you mentioned you will have the broad available for sale sometime on the passdiy.com. Did you change your mind not to go for sale?

tommak · 24th September 2008, 07:21 AM

Quote:

Originally posted by hc167
oh, by the way, Mr. Pass, you mentioned you will have the broad available for sale sometime on the passdiy.com. Did you change your mind not to go for sale?

Mr. Pass, when you start selling the "broad" on passdiy.com, I'd like a cute, blond one please!

Nelson Pass · 24th September 2008, 08:41 PM

Quote:

Originally posted by hc167
oh, by the way, Mr. Pass, you mentioned you will have the broad available for sale sometime on the passdiy.com. Did you change your mind not to go for sale?

Everything takes time. Lots of time.

Blues · 24th September 2008, 10:29 PM

It will be one hot broad

...I hope there'll be enough for everyone.

22nd September 2008, 10:49 PM	#1812
Ed LaFontaine ...truth seeker... diyAudio Member Join Date: Feb 2004 Location: where the Appalachians rise from the Blue Grass	cheap?...who's cheap? hc167, You could do a lot worse than check here for parts: The Company Store Take care that he has had his morning coffee 1st __________________ ...call me Ed...Special Ed... EnABL kit http://www.diyaudio.com/forums/swap-meet/119852-enabl-kit.html DCB1 parts http://www.diyaudio.com/forums/swap-...ml#post2361098

23rd September 2008, 10:30 AM	#1813
jameshillj diyAudio Member Join Date: Feb 2005 Location: Melbourne, Aust	point-to-point option Can get the 'vero' board everywhere - the fibreglas board with all the holes and no copper - perfectly good option to pcb and often better. __________________ ... jh

24th September 2008, 10:29 PM	#1820
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: The Milky Way	It will be one hot broad ...I hope there'll be enough for everyone. __________________ Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html

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22nd September 2008, 10:36 PM	#1811
hc167 diyAudio Member Join Date: Oct 2006	point to point is good too. I just want to be as professional as possible. Well, maybe I should re-think about it. plus point to point is almost always cheaper.

23rd September 2008, 06:49 PM	#1814
hc167 diyAudio Member Join Date: Oct 2006	this is what I am thinking now. actually, I may consider using only one broad for both channels. that way I can reduce the amount of cable from power supply to the broad, and that end up having better physical component arrangement in the amp (If I do everything right). Since F5 has simple circuit design, I think point to point is good way of build it.

23rd September 2008, 07:05 PM	#1815
khaho diyAudio Member Join Date: Mar 2006 Location: Tampere	I am quite a newbie, but I see two problems in one board for both channels: 1) the current needed from PSU is doubled with less wires and thats quite demanding for full power of F5 (this could make channel separation worse at high power) 2) cooling arrangement is worse, you need really big one heatsink or the board must be between heatsinks, making the size of the board quite fixed for a case of some size (you should not have long wires to gates of the mosfets, or gate resistors should at least be near the mosfets)

23rd September 2008, 07:25 PM	#1816
hc167 diyAudio Member Join Date: Oct 2006	Thanks a lot for your comments. Well, first, the current will depend on how you arrange your component on the broad and the wire that you use. So I do not think I will worry too much about it. Second, I said I will use one broad, but I never said I will mount the power devices on the broad. In stead, I think the device should mount on the heatsink directly and separate from the broad. The reason why I think this way is I build a Aleph 30 before and from my experience, problem with power device on one broad is the broad will get hot too. Especially we are building a class A amp. So I want to let all the component as cool as possible. I guess the best way to do is not to mount the device on the broad. yes, it is little more work. but I think that is ok. plus I am not good at drilling hole on heat sink. so good thing about this design is I only need to drill and tap two holes for each channel. drilling holes on heat sink and then tap is just too painful for me.

24th September 2008, 06:05 AM	#1817
hc167 diyAudio Member Join Date: Oct 2006	oh, by the way, Mr. Pass, you mentioned you will have the broad available for sale sometime on the passdiy.com. Did you change your mind not to go for sale?

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