Class D Amp with LM566,LM393 and 2XIRF530 - Page 33

SAEED JOON · 12th February 2013, 04:28 PM

yes apex

but they are not so professional and industrial production
visit http://labgruppen.com/
they have up to 20000W!! (20KW) D-class amplifier and use toroid cores.
(its visible in PLM20000 photos)
also bosch (Dynacord powermate-3 DSA series) and Crown as i sow before
and HONAMIC also

apexaudio · 12th February 2013, 07:06 PM

Quote:

Originally Posted by SAEED JOON

yes apex

but they are not so professional and industrial production
visit http://labgruppen.com/
they have up to 20000W!! (20KW) D-class amplifier and use toroid cores.
(its visible in PLM20000 photos)
also bosch (Dynacord powermate-3 DSA series) and Crown as i sow before
and HONAMIC also

D200 also is not professional and industial product

just simple class D amp for diy.
Regards

IRSound · 12th February 2013, 11:50 PM

SAEED JOON,

lab amps aren't class-d , their amps are based on Tracking Class-D or TD and the final stage is an AB class Amplifier.
Crown also using Micrometals -2 material but they are original core and never gets warm in low output current like you said before. for example T157-2 gets warm about 55 degree @ 10A output current and 150vPP inductor voltage i guess.
Dynacord is new in Class-D , i saw their using torodial core in PM-3 but can't guess the type of material because it's not visible clearly. maybe -2 material. you got a picture from inside ?

what is HONAMIC then !? any picture form inside ?

_________________

as apex said , D200 is good for start working on class-d , i learned meany things with this amp.

Regards,
IRSound

SAEED JOON · 13th February 2013, 12:51 PM

dear IRsound
u absolutely right
in PM-3 they used 4 stage filter back to back, that core induction decrease in each stage and make the output signal clear and linear just like an AB-class amp output
2 of this cores are clear-red micrometal and 2 other (last stages) are regular white core and dark gray.

as u know D200 is amplifire stage of mackie SRM450 active speakers with -/+75volt rail voltage and absolutely is a high power industrial, safe, and good design.

also its designed base on IRAUDAMP1 from IR reference designed series and its so simple but accurate.
(Honamic is my Brand

)

Regards,

IRSound · 13th February 2013, 04:24 PM

Thanks for pictures , did you repair it ? if you have any other info (like part numbers of fets ,etc) please share with us.
using higher order filters isn't very easy , it should design carefully to obtain a good result.

yes i know everything about D200..the input stage-modulator-level shifter circuit taken from Mackie. the power stage-driver is taken from a russian amp. mile upload both schematic before. also the filter characteristic is like mackie.

Quote:

(Honamic is my Brand)

commercial Class-D amps ?

Regards

lycanlk · 14th February 2013, 02:15 PM

I reduced the number of turns on the inductor. Now it has 26 turns. I think I made a mistake. According to this: T106-2 It must have 47 turns.

10R/5W resistor heated up too much. I could even smell it. Could hear some noise. FETs also heated up like a class AB amp. Small heatsink is not enough. Are these all because of reducing the turns or something else?

need some help!
Thanks

apexaudio · 14th February 2013, 02:32 PM

Quote:

Originally Posted by lycanlk

I reduced the number of turns on the inductor. Now it has 26 turns. I think I made a mistake. According to this: T106-2 It must have 47 turns.

10R/5W resistor heated up too much. I could even smell it. Could hear some noise. FETs also heated up like a class AB amp. Small heatsink is not enough. Are these all because of reducing the turns or something else?

need some help!
Thanks

Use 65 turns on T106-2 for 30uH

IRSound · 14th February 2013, 03:40 PM

Quote:

Use 65 turns on T106-2 for 30uH

65 turn will have inductance around 57uH. with 49 Trun of 0.8mm wire , will get 33uH.
- with 26 turn , will have 9uH which is very low and have higher Cut-off frequency more than 75KHz , it have bad effect on output HF.
Regards

apexaudio · 14th February 2013, 05:00 PM

From IRAUDAMP1 manual
http://www.irf.com/technical-info/re.../iraudamp1.pdf

lycanlk · 15th February 2013, 05:19 PM

Apex and IRsound,

Thanks for the help!

After winding about 45 turns, it gave me a good result. I had to increase the value of 510R to 2K2 to reduce the noises. Now everything is good. I will wind more turns and test it again later then i wouldn't need to increase 510R.

So far I couldn't reduce the heat emission of outputs in each case. May be IRF640 is not good. Unfortunately I can't find IRFB numbers here.

Amp is stable and overall good. What do you suggest me to increase the output power. Bridging 2 of these or increasing the voltage and outputs?

and waiting for your new amp(pcb)

thanks!

12th February 2013, 04:28 PM	#321
SAEED JOON diyAudio Member Join Date: Jul 2010	yes apex but they are not so professional and industrial production visit http://labgruppen.com/ they have up to 20000W!! (20KW) D-class amplifier and use toroid cores. (its visible in PLM20000 photos) also bosch (Dynacord powermate-3 DSA series) and Crown as i sow before and HONAMIC also __________________ Honamic Audio Industries

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15th February 2013, 05:19 PM	#330
lycanlk diyAudio Member Join Date: Sep 2009	Apex and IRsound, Thanks for the help! After winding about 45 turns, it gave me a good result. I had to increase the value of 510R to 2K2 to reduce the noises. Now everything is good. I will wind more turns and test it again later then i wouldn't need to increase 510R. So far I couldn't reduce the heat emission of outputs in each case. May be IRF640 is not good. Unfortunately I can't find IRFB numbers here. Amp is stable and overall good. What do you suggest me to increase the output power. Bridging 2 of these or increasing the voltage and outputs? and waiting for your new amp(pcb) thanks!