My discrete class d project

nigelwright7557 · 7th November 2010, 01:51 AM

Just started on a new project, a class d discrete approach.

Uses triangle wave generator, comparator, xor phase splitter and irs2113 hi/lo side switch.

Still in the testing stage.

nigelwright7557 · 7th November 2010, 01:54 AM

1

nigelwright7557 · 7th November 2010, 11:38 PM

Circit diagram.
A bit small due to screen capture.

nigelwright7557 · 9th November 2010, 11:03 PM

Still testing.

Got the square wave and ramp working cleanly by adjusting components.

Designed improved level translator from output of comparator to xor gates.
This works cleanly now.

At this point it outputs sound althogh with a little more noise than i would like.
Found tweaking the DC offset improved the noise situation.

Output MOSFETs were getting warm so changed gate resistors from 10R to to 56R now they stay cold.

savu · 9th November 2010, 11:22 PM

can you provide a readable schematic?

regards,
savu

nigelwright7557 · 9th November 2010, 11:31 PM

Quote:

Originally Posted by savu

can you provide a readable schematic?

regards,
savu

Thats the best i can do without chopping it up into quarters and then it would be meaning less.

My earlier message explains all the stages.
Ramp generator and audio input, comparator, xor phase splitter, hi/lo side switch into irfb4019 mosfets.

Its pretty basic really. Sadly takes more components than a 2092 circuit but what components it uses are very cheap. The inductor is the most expensive part then the £2-50 IRS2113.

savu · 10th November 2010, 03:34 AM

Here is a similar project with discrete parts,

+/-45Vdc supply, 150W RMS into 4 ohm, 250khz, 0.31% THD @ max power, 1.6W dissipated per Mos Fet.

It only exists in LTspice, I never built it.

Regards,
savu

Th3 uN1Qu3 · 11th November 2010, 05:27 PM

Quote:

Originally Posted by savu

It only exists in LTspice, I never built it.

Well then would you mind if i build it? However i'll use higher supply rails and two pairs of MOSFETs, i need 200-300W on 8 ohms.

savu · 11th November 2010, 05:49 PM

I wouldn't mind.

tell me the exact configuration and the parts that you intend to use in order to redesign it for you're specific needs.

regards,
savu

Th3 uN1Qu3 · 11th November 2010, 06:04 PM

I'll have to examine the schematic more thoroughly - i'll do so in the weekend.

7th November 2010, 01:51 AM	#1
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	My discrete class d project Just started on a new project, a class d discrete approach. Uses triangle wave generator, comparator, xor phase splitter and irs2113 hi/lo side switch. Still in the testing stage. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

7th November 2010, 01:54 AM	#2
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	1 __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

7th November 2010, 11:38 PM	#3
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Circit diagram. A bit small due to screen capture. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

9th November 2010, 11:03 PM	#4
nigelwright7557 diyAudio Member Join Date: Apr 2008 Location: Carlisle, England	Still testing. Got the square wave and ramp working cleanly by adjusting components. Designed improved level translator from output of comparator to xor gates. This works cleanly now. At this point it outputs sound althogh with a little more noise than i would like. Found tweaking the DC offset improved the noise situation. Output MOSFETs were getting warm so changed gate resistors from 10R to to 56R now they stay cold. __________________ http://www.murtonpikesystems.co.uk PCBCAD40 pcb design software.

9th November 2010, 11:22 PM	#5
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	can you provide a readable schematic? regards, savu __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.


	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

11th November 2010, 05:49 PM	#9
savu diyAudio Member Join Date: Feb 2007 Location: Cluj - Napoca	I wouldn't mind. tell me the exact configuration and the parts that you intend to use in order to redesign it for you're specific needs. regards, savu __________________ 1'st rule of chess: The only way to get smarter is by playing a smarter opponent.

11th November 2010, 06:04 PM	#10
Th3 uN1Qu3 diyAudio Member Join Date: Feb 2010 Location: Bucharest	I'll have to examine the schematic more thoroughly - i'll do so in the weekend. __________________ "Audio grade" components simply means that they failed at a more critical job.

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

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
My all discrete prefilter class-D	kartino	Class D	10	7th August 2006 08:47 AM
My 13x discrete class-D	kartino	Class D	6	21st November 2005 07:44 AM
recommend discrete Class D	rellik	Class D	11	3rd November 2005 01:27 AM
How much innovation is possible with Discrete Class-A Amplifiers?	dgardner	Solid State	20	12th August 2005 01:13 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