My all discrete prefilter class-D

kartino · 2nd August 2006, 02:13 AM

Hi,

I am interested in all discrete class D because I can make them with cheap parts, and availability.

During I redesign the UcD DIY I found that the my new design is good also for prefilter feedback. Actually I use two feedback prefilter for positive feedback oscillation and post filter to control gain.

But this time I just works on simulation. But the result from simulation seems good.

kartino · 2nd August 2006, 02:14 AM

This is the filmuation file in LTSpice

kartino · 2nd August 2006, 02:19 AM

Gate driver... on-off

classd4sure · 2nd August 2006, 02:21 AM

Hi,

I'm no pro when it comes to feedback networks but usually when you have a mix of pre-post you end up with a load dependant amp that requires a zobel network. How does yours fair in this regard?

kartino · 2nd August 2006, 02:36 AM

Hi Chris,

Of course I am not a pro too.... I need comments from this forum.

This is output plot...

I have no time to try on real circuit, I shall apply visa to Aussie..

kartino · 2nd August 2006, 03:03 AM

Hi Chris,

This is post-filter feedback simulation that use same circuit from above pre-filter feedback.

I didn't see so much difference from the both simulation result. Please check and maybe you will find the difference.

kartino · 2nd August 2006, 03:05 AM

in PDF

kartino · 2nd August 2006, 05:22 AM

Does any guide to design zobel network for full range?

kartino · 7th August 2006, 04:15 AM

Hi,

I just remove the feedback from post filter output. The gain control is done by control the voltage feedback signal from prefilter itself. Simply, if the feedback is higher than the gain is lower vice versa. So no matter for the gain control.

Simpler feedback loop than post filter indeed.

kartino · 7th August 2006, 04:23 AM

the output looks symmetric, again, frequency controlled easily just change value of C11, lower faster, vice versa.

Still no comment?

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 NON-discrete SODFA class-D amp	SSassen	Class D	134	22nd May 2007 02:51 PM
Noise problems in non discrete class-d amp	Baldin	Class D	26	18th February 2007 08:00 AM
Discrete Class-D anno 1986	Baldin	Class D	11	26th October 2006 07:30 PM
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

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

2nd August 2006, 02:21 AM	#4
classd4sure Account Disabled Join Date: Feb 2004	Hi, I'm no pro when it comes to feedback networks but usually when you have a mix of pre-post you end up with a load dependant amp that requires a zobel network. How does yours fair in this regard?

2nd August 2006, 05:22 AM	#8
kartino diyAudio Member Join Date: Feb 2005 Location: Gunungkidul Indonesia	Does any guide to design zobel network for full range?

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