Pictures and circuits of my DIY class D and other projects. - Page 9

zilog · 28th January 2007, 08:07 PM

I have protection against undervoltage, overvoltage (both rails, ~48V) and overcurrent on both output devices.

I have used wire connections to be able to use an unbroken ground plane, hopefully this keeps inductances down compared with a broken ground plane.

classd_fromru · 28th January 2007, 08:57 PM

zilog,
I think that if crosspieces to make on the second layer, it not considerably will affect parasitic inductance. But it will be more beautifully and more technologically.

OVP its good! A have only OCP protection...

rogs · 29th January 2007, 01:21 AM

I have 3 different UcDs - a Hypex UcD 180, a Philips Demo PCB, and a home made through hole prototype.

One thing I have discovered is that for short circuit protection when the amplifiers are 'on', but with no input signal present, OVP is essential.

Obviously OCP doesn't really help in this situation, but on all 3 amplifiers the -ve supply goes crazy under short circuit conditions (it pumps more and more negative), and eventually the lower Mosfet will fail. The UcD 180 has been OK, because it has OVP, and my home made one is (mostly) OK now it has OVP, but the Philips board is well and truly dead!!

So, a big 'yes' to OVP IMHO

stewin · 23rd September 2011, 12:53 PM

hi class d from ru . wow i can,t believe i found this forum. i have made this amp using irf540n .at first it used to heat like crazy but i found the solution by changing resistor from 220r to 440r . your amp is powerful will post you pictures of my trials . i never got smd components and irfb fet because of my location will post pictures

stewin · 24th September 2011, 09:06 AM

hi class d from ru i will upload pictures of my projects once i get hold of a camera thanks

luka · 24th September 2011, 11:48 AM

what is this? if this works some what ok...

stewin · 24th September 2011, 03:54 PM

hi luka it works fine,silent and very powerful .but i haven,t reached to over +/- 54vlts because of outputfets (i didnt find any bat or 1n58xx diodes so i just used the in4148) the best i can get was irf540n and irf640 they. used to heat insanely at first but when i changed resistor from to 220R to 440R all was fine

i don't have a scope to verify it but it works fine . the fets warm when operating at high volume levels . recently i found these fets irfb23n20 i will try them with +/- 90vlts hope i am in the right track.

dudaindc · 21st December 2011, 04:07 PM

Quote:

Originally Posted by stewin

hi class d from ru i will upload pictures of my projects once i get hold of a camera thanks

Did you get a hold of a camera?

luka · 21st December 2011, 06:24 PM

Quote:

Originally Posted by stewin

hi luka it works fine,silent and very powerful .but i haven,t reached to over +/- 54vlts because of outputfets (i didnt find any bat or 1n58xx diodes so i just used the in4148) the best i can get was irf540n and irf640 they. used to heat insanely at first but when i changed resistor from to 220R to 440R all was fine

i don't have a scope to verify it but it works fine . the fets warm when operating at high volume levels . recently i found these fets irfb23n20 i will try them with +/- 90vlts hope i am in the right track.

those resistors are 10x too big... you shouldn't ever need to go above 100R

stewin · 30th March 2012, 10:50 PM

hi class d from ru ,luka and others here is my project based on this good amp but using non smd components ,totem pole parallel outputs

http://www.diysmps.com/forums/showth...ed-help/page16

24th September 2011, 11:48 AM	#86
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	what is this? if this works some what ok... __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

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
Technics Class A Bias Circuits	sdman	Solid State	5	1st July 2010 05:58 PM
DIY projects with pictures and measurements	Phil Olson	Multi-Way	11	12th September 2007 04:49 PM
M61571AFP,50W 5.1ch CLASS D mini amp projects	digi01	Class D	8	8th September 2004 09:37 PM
JLH 10W Class A Amps and PSU Circuits	DomKo	Solid State	2	19th October 2003 09:53 AM
For people who like seeing pictures of other peoples "projects"	SkinnyBoy	Everything Else	48	5th January 2003 11:38 PM

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

28th January 2007, 08:07 PM	#81
zilog diyAudio Member Join Date: Oct 2005	I have protection against undervoltage, overvoltage (both rails, ~48V) and overcurrent on both output devices. I have used wire connections to be able to use an unbroken ground plane, hopefully this keeps inductances down compared with a broken ground plane.

28th January 2007, 08:57 PM	#82
classd_fromru diyAudio Member Join Date: Nov 2006	zilog, I think that if crosspieces to make on the second layer, it not considerably will affect parasitic inductance. But it will be more beautifully and more technologically. OVP its good! A have only OCP protection...

29th January 2007, 01:21 AM	#83
rogs diyAudio Member Join Date: Jul 2006	I have 3 different UcDs - a Hypex UcD 180, a Philips Demo PCB, and a home made through hole prototype. One thing I have discovered is that for short circuit protection when the amplifiers are 'on', but with no input signal present, OVP is essential. Obviously OCP doesn't really help in this situation, but on all 3 amplifiers the -ve supply goes crazy under short circuit conditions (it pumps more and more negative), and eventually the lower Mosfet will fail. The UcD 180 has been OK, because it has OVP, and my home made one is (mostly) OK now it has OVP, but the Philips board is well and truly dead!! So, a big 'yes' to OVP IMHO

23rd September 2011, 12:53 PM	#84
stewin diyAudio Member Join Date: Jul 2007	hi class d from ru . wow i can,t believe i found this forum. i have made this amp using irf540n .at first it used to heat like crazy but i found the solution by changing resistor from 220r to 440r . your amp is powerful will post you pictures of my trials . i never got smd components and irfb fet because of my location will post pictures

24th September 2011, 03:54 PM	#87
stewin diyAudio Member Join Date: Jul 2007	hi luka it works fine,silent and very powerful .but i haven,t reached to over +/- 54vlts because of outputfets (i didnt find any bat or 1n58xx diodes so i just used the in4148) the best i can get was irf540n and irf640 they. used to heat insanely at first but when i changed resistor from to 220R to 440R all was fine i don't have a scope to verify it but it works fine . the fets warm when operating at high volume levels . recently i found these fets irfb23n20 i will try them with +/- 90vlts hope i am in the right track.

30th March 2012, 10:50 PM	#90
stewin diyAudio Member Join Date: Jul 2007	hi class d from ru ,luka and others here is my project based on this good amp but using non smd components ,totem pole parallel outputs http://www.diysmps.com/forums/showth...ed-help/page16

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)