First attempt of TD Class on LecoAmp above 100Vrms

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   After studying and studying, Yamaha and Labgruppen TD amplifiers schematics, I decided to give a try to implementate something on mine AB class amplifier. 

So I go to the Yamaha's Eee schematics (autooscilant) and extracted what I need for implementation to see if it works.

Yamaha uses on each rail +Vcc and -Vcc ,3 pairs of transistors in voltage amplifier (2SA1492A +2SC3856A) ,I used just one pair of MJL21195+MJL21196 , and 3 pairs of mosfets in current amplifier (2SK3004), I used one pair of IXTQ52N30P (very fast and small gate charge mosfet)in tests.

Officially Yamaha's use +/- 155Vcc in idle and in load, the supply falls down till around +/- 110Vdc, they use a very small power supply SMPS, but that's not important.

After tests and tests , starting from +/- 110Vdc, I pushed far to +/- 170Vcc   in idle(+/- 165Vcc in full load), because mine SMPS is with PFC, and drops just 10 Volts (+5 -5 on each rail) from idle to full load, and I have obtained what U can see in the movies.

Don't laugh about "spider" connection of SMPS and TD part, just take couple minutes of your life and watch the small movies on youtube.

Comments are very appreciated and welcomed, expecially about output power!

Next week I will give a try, to implement modulate TD like Labgruppen, at 250Khz and 500Khz too, because on autooscilant Yahana TD Design, I hear sounds in coils, and gives small switching artefacts, more visible at 1000Hz.

I obtained 109-110Vrms on 4 ohm dummy load, and trying into clip, smps has shut down (I have calibrate protection to act at around 3400-3500W)

 http://www.youtube.com/watch?v=7bMcDikRjTg&feature=player_embedded

 http://www.youtube.com/watch?v=guoLw9e4Seg&feature=player_embedded

Edited by DjLeco - 03 July 2011 at 3:11am

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DjLeco Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817	Post Options Post Reply Quote DjLeco Report Post Thanks(0) Quote Reply Topic: First attempt of TD Class on LecoAmp above 100Vrms Posted: 02 July 2011 at 1:22pm
	After studying and studying, Yamaha and Labgruppen TD amplifiers schematics, I decided to give a try to implementate something on mine AB class amplifier. So I go to the Yamaha's Eee schematics (autooscilant) and extracted what I need for implementation to see if it works. Yamaha uses on each rail +Vcc and -Vcc ,3 pairs of transistors in voltage amplifier (2SA1492A +2SC3856A) ,I used just one pair of MJL21195+MJL21196 , and 3 pairs of mosfets in current amplifier (2SK3004), I used one pair of IXTQ52N30P (very fast and small gate charge mosfet)in tests. Officially Yamaha's use +/- 155Vcc in idle and in load, the supply falls down till around +/- 110Vdc, they use a very small power supply SMPS, but that's not important. After tests and tests , starting from +/- 110Vdc, I pushed far to +/- 170Vcc in idle(+/- 165Vcc in full load), because mine SMPS is with PFC, and drops just 10 Volts (+5 -5 on each rail) from idle to full load, and I have obtained what U can see in the movies. Don't laugh about "spider" connection of SMPS and TD part, just take couple minutes of your life and watch the small movies on youtube. Comments are very appreciated and welcomed, expecially about output power! Next week I will give a try, to implement modulate TD like Labgruppen, at 250Khz and 500Khz too, because on autooscilant Yahana TD Design, I hear sounds in coils, and gives small switching artefacts, more visible at 1000Hz. I obtained 109-110Vrms on 4 ohm dummy load, and trying into clip, smps has shut down (I have calibrate protection to act at around 3400-3500W) http://www.youtube.com/watch?v=7bMcDikRjTg&feature=player_embedded http://www.youtube.com/watch?v=guoLw9e4Seg&feature=player_embedded Edited by DjLeco - 03 July 2011 at 3:11am
	I'm A Stupid SMART Romanian...

DjLeco Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817	Post Options Post Reply Quote DjLeco Report Post Thanks(0) Quote Reply Posted: 02 July 2011 at 6:41pm
	50+ views and no one comment? Please comment about power, or anything
	I'm A Stupid SMART Romanian...

fredos666 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 October 2008 Status: Offline Points: 205	Post Options Post Reply Quote fredos666 Report Post Thanks(0) Quote Reply Posted: 03 July 2011 at 12:47am
	Very nice, but clean your workplace! It's dangerous to work with so much stuff that can make a short...3000W into 4 ohms is nice! Can you send me schematics on the yamaha self oscilating tracking supply? Thanks Fredos f_bourque@hotmail.com

DjLeco Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817	Post Options Post Reply Quote DjLeco Report Post Thanks(0) Quote Reply Posted: 03 July 2011 at 1:34am
	I like a little mess on my workplace. The amplifier have shortcircuit protection, nothing to fear... Mail sent. Also I'm a little interested avout your classD amp with groundbridge topology, maybe U can send me some schematics.
	I'm A Stupid SMART Romanian...

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 03 July 2011 at 8:48pm
	Very interesting. I was going to give the self-oscillating rail tracking a go a while ago but I couldn't get simulations to work so I lost interest and have never gone back to it. Maybe one day I'll have another try.

DjLeco Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817	Post Options Post Reply Quote DjLeco Report Post Thanks(0) Quote Reply Posted: 03 July 2011 at 10:21pm
	Is very nice sollution implemented in FP13000 Lab. But is an integrated circuit, or even an small module, who takes a fragment of emmiter resistors of output devices, and give at his out out, directly PWM+analog signal for optocoupler wich commands switching devices.. If someone knows part list, let me know, I want to know wich circuit is on U6 PWMPATD and U5 PWMNATD of A50TD module... Or if someone has inside pictures of it... Edited by DjLeco - 03 July 2011 at 10:22pm
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fredos666 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 October 2008 Status: Offline Points: 205	Post Options Post Reply Quote fredos666 Report Post Thanks(0) Quote Reply Posted: 10 July 2011 at 6:21pm
	Did you get schematics of labgruppen Mr DjLeco?

DjLeco Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817	Post Options Post Reply Quote DjLeco Report Post Thanks(0) Quote Reply Posted: 11 July 2011 at 10:44am
	The P5000-P7000, I have it deja... I'm interesed if anyone can decript, what's in driver module of A25TD14 amplifier, called PWMPATD (U6) and PWMNATD (U5) custom module.
	I'm A Stupid SMART Romanian...

fredos666 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 October 2008 Status: Offline Points: 205	Post Options Post Reply Quote fredos666 Report Post Thanks(0) Quote Reply Posted: 25 July 2011 at 10:44pm
	Sent you by email my version...Up to you to post it if you want! :) Not as powerfull, but...

DjLeco Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 21 April 2009 Location: Bucharest Status: Offline Points: 817	Post Options Post Reply Quote DjLeco Report Post Thanks(0) Quote Reply Posted: 26 July 2011 at 8:09pm
	Interesing procedure, but is not like an TD, but ideea can be developed. Sorry for not answering to mail, but bad internet connection(alot of waiting for page loading) Now I'm working to definitivate SMPS project, after finishing, I will contiune to develop the TD class on mine module. Keep close and success to all in your projects.
	I'm A Stupid SMART Romanian...

fredos666 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 11 October 2008 Status: Offline Points: 205	Post Options Post Reply Quote fredos666 Report Post Thanks(0) Quote Reply Posted: 27 July 2011 at 9:19pm
	Idea was just to ''assist'' output device with a switching converter...The good thing is that the analogue amp will never see any difference between 16 ohms load and a 2 ohms load. Current limiting could be easily done at switching stage. I think this could be more efficient and more simple than a TD design. This is based on the eeengine of yamaha, good idea, but badly implemented in their design!