Salas hotrodded blue DCB1 build - Page 202

jeff517 · 12th July 2012, 06:29 PM

Ive read that matched LEDs are, and are not necessary. Now is this for Vref? or CCS?
I'm just figuring all this stuff out. And also Does it matter if I have more than the required V all my LEDs measure at between 1.895 Vf and 1.915 Vf. So 5 x any of them will be more than 9V for Vref and 3 x any of them will be more than 5.4V for CCS. Or should I just stick'em on the board and not worry?

Salas · 12th July 2012, 08:39 PM

No worries with your LEDs they are tight.

BigE · 12th July 2012, 08:47 PM

What sort of heatsinking is necessary for the DCB1 running @ 600 ma?

Is the floor of the enclosure plus spreaders good enough, or do we need to use amplifier heatsinks?

Does the enclosure need to be ventillated?

Salas · 12th July 2012, 08:51 PM

~1.5C/W per rail for two Mosfets each or better. Ventilation of course. Your criterion should be no more than 60C on metal with any sinking plan.

BigE · 13th July 2012, 02:18 PM

I'm not sure I understand. 1.5 C/W each mosfet ? Or 3.0 each mosfet and 1.5 for both connected to one sink?

If 3, then board level will work, otherwise they start to get BIG
Thanks.

Salas · 13th July 2012, 02:27 PM

Quote:

Originally Posted by BigE

3.0 each mosfet and 1.5 for both connected to one sink

1.5W/C parallel sink per side bolting the side's 2 Mosfets to it, or 3W/C per Mosfet.

BigE · 02:36 PM

Excellent! Thank you!

That should be enough to buy all the external parts! Hopefully, I can find some the fit!

Cheers!

Maybe this?
http://www.aavid.com/products/standard/530002b02500g

Renron · 13th July 2012, 04:28 PM

Any issues (inductance) with using a 10R 5w Wirewound for setting the mA level?

Salas · 13th July 2012, 06:17 PM

No issues.

Salas · 13th July 2012, 06:48 PM

Quote:

Originally Posted by BigE

Excellent! Thank you!
Maybe this?
530002B02500G - Board level heatsinks

No, get sink with flat back surface side mounted along the PCB edge. Something like this that can accommodate both Mosfets each side of the PCB.

SK 92/100 SA - FISCHER ELEKTRONIK - HEAT SINK, 100MM, 1.4°C/W | Farnell United Kingdom

13th July 2012, 02:32 PM	#2017
BigE diyAudio Member Join Date: Aug 2008 Location: Toronto	Excellent! Thank you! That should be enough to buy all the external parts! Hopefully, I can find some the fit! Cheers! Maybe this? http://www.aavid.com/products/standard/530002b02500g Last edited by BigE; 13th July 2012 at 02:36 PM. Reason: added url

13th July 2012, 04:28 PM	#2018
Renron diyAudio Member Join Date: Jan 2007 Location: Sacramento	Any issues (inductance) with using a 10R 5w Wirewound for setting the mA level? __________________ "If it doesn't work properly, hope it catches on fire"- Nelson Pass @ BA3 "I fired up the prototype. Literally." The Prophet Pass.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
dcb1 buffer with shunt reg.	merlin2069er	Swap Meet	0	3rd August 2010 05:25 PM
F2 and DCB1 parts selection - please advice!	DQ	Pass Labs	6	25th November 2009 03:20 PM
Y B Blue - how blue LED improves the CD playback	Peter Daniel	Digital Source	176	25th September 2003 07:40 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

12th July 2012, 06:29 PM	#2011
jeff517 diyAudio Member Join Date: Mar 2012 Location: Traverse City MI.	Ive read that matched LEDs are, and are not necessary. Now is this for Vref? or CCS? I'm just figuring all this stuff out. And also Does it matter if I have more than the required V all my LEDs measure at between 1.895 Vf and 1.915 Vf. So 5 x any of them will be more than 9V for Vref and 3 x any of them will be more than 5.4V for CCS. Or should I just stick'em on the board and not worry?

12th July 2012, 08:39 PM	#2012
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No worries with your LEDs they are tight.

12th July 2012, 08:47 PM	#2013
BigE diyAudio Member Join Date: Aug 2008 Location: Toronto	What sort of heatsinking is necessary for the DCB1 running @ 600 ma? Is the floor of the enclosure plus spreaders good enough, or do we need to use amplifier heatsinks? Does the enclosure need to be ventillated?

12th July 2012, 08:51 PM	#2014
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	~1.5C/W per rail for two Mosfets each or better. Ventilation of course. Your criterion should be no more than 60C on metal with any sinking plan.

13th July 2012, 02:18 PM	#2015
BigE diyAudio Member Join Date: Aug 2008 Location: Toronto	I'm not sure I understand. 1.5 C/W each mosfet ? Or 3.0 each mosfet and 1.5 for both connected to one sink? If 3, then board level will work, otherwise they start to get BIG Thanks.

13th July 2012, 06:17 PM	#2019
Salas diyAudio Chief Moderator Join Date: Oct 2002 Location: Athens-Greece	No issues.