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Class D Switching Power Amplifiers and Power D/A conversion

HK HS500 - power and other measurements
HK HS500 - power and other measurements
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Old 19th February 2018, 07:32 AM   #21
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
...i found that....http://www.irf.com/product-info/audi...sdtutorial.pdf

...so i need time to go ahead.....


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Old 23rd February 2018, 05:10 AM   #22
chermann is offline chermann  Austria
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Join Date: Jan 2017
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Good Morning..

Just do be sure that i havent implemented an error in my amp.

I got no answer in this thread about the caps:
Is ST FFX the same as DDX ?

actually i know that 50v is correct value but about capacity...
i changed the old caps 1000F/50V to bigger 3300F/50V audio (nichicon UFW1H332MHD)

Is it better to have at the same size more capacity or is it the better to have a cap with low Esr witch is used in e.g. in a SMPS?

thanks for your help
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Old 23rd February 2018, 06:08 AM   #23
chermann is offline chermann  Austria
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Default ....now i have time to ask...

actually i am searching for the way how the signal is gooing thru the amp via coax in.

coax in --- to 74HC158Quad 2-input multiplexer -- chip AML3278 (GPIO) What s that for a chip --- and then it should go to the DDX8001 and then ---- to the amp DDX2160.

actually i didnt find the complete way how it goes ...


link for the service manual:
Download Harman-Kardon HS 500 Owner's Manual

here are the attachments : the relevant schematics i found

thx
Attached Files
File Type: pdf coaxin_HS-500.pdf (429.7 KB, 7 views)
File Type: pdf schematic_94_96_HS-500.pdf (738.8 KB, 9 views)
File Type: pdf Block diagram_HS-500.pdf (80.3 KB, 4 views)
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Old 26th February 2018, 09:48 AM   #24
chermann is offline chermann  Austria
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....bump it up.......
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Old 26th February 2018, 07:55 PM   #25
chermann is offline chermann  Austria
diyAudio Member
 
Join Date: Jan 2017
Location: Vienna
Default Load Box non inductive ready

hi

actually my test load box is ready:

i used an old case from a 10 euro Teac CDP 3000.
i mount this Resistors 8 ohms /50W in
katur 4 50 W 8 Ohm-LED Laden Widerstande fur LED Blinker Licht oder LED License Plate Beleuchtung oder DRL (Fix Hyper Flash, Warnung cancellor) mit 8 Schnelle Draht Clip: Amazon.de: Auto

because of too less heatsink i have to mount fans. i used this:
Axiallufter 12 V/DC 149.4 m3/h (L x B x H) 120 x 120 x 25 mm ADDA AD1212HB-A70GL
13 euro each
...i tried with 2x 4ohm lines (not directly as neighbor) 30min at max and the buttom plate directly under the resistors gets 69 c....so it ok.
..other pic you will find in the posts before....post 1 pic 2...

so the amps could be tested now !

cu
chris
Attached Images
File Type: jpg R_Loadbox_rear.jpg (222.9 KB, 39 views)
File Type: jpg R_Loadbox_top.jpg (252.6 KB, 39 views)

Last edited by chermann; 26th February 2018 at 07:58 PM.
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Old 1st March 2018, 05:08 AM   #26
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Quote:
Originally Posted by chermann View Post
Good Morning..

Just do be sure that i havent implemented an error in my amp.

I got no answer in this thread about the caps:
Is ST FFX the same as DDX ?

actually i know that 50v is correct value but about capacity...
i changed the old caps 1000F/50V to bigger 3300F/50V audio (nichicon UFW1H332MHD)

Is it better to have at the same size more capacity or is it the better to have a cap with low Esr witch is used in e.g. in a SMPS?

thanks for your help
...bump it up....
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Old 12th March 2018, 07:27 AM   #27
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Hello again


I did some tests about OCP of thsi chip set. Is it normal that after OCP happend is some cases you can push the volume up?

As you can see at my yyesterdays night session (really short) i have the situation that at max power ( I =1,8 per channel) the ocp is not allowing to switch up...that ok for my understanding. At the current beloww e.g. I out = 1,3Ampere after OCP is acting you can push the volume up.
generally i found that the ocp is shuting down at about 70% of the set current ...is this calculated.


thanks for your help
Attached Files
File Type: pdf HS500_OCP.pdf (52.9 KB, 7 views)

Last edited by chermann; 12th March 2018 at 07:33 AM.
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Old 12th March 2018, 08:45 AM   #28
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Default ...frequency response at 4 ohm..

After listening test on different speakers i will recommend to do not use 4 ohm impedance speakers but stetp by step:

I bought this device (second hand as defect for 40euro) to try to get this alive and start with diy ....this all in one amp is sold at 2007 2008 in different countries. after bring the SMPS to live and change all caps on the power amp board and additionaly I changed the input caps at the input board all functions are working the DVD, Tuner and the amp is working.

after the strange SMPS behavior (other thread) ...maybe after burn in .......its fully working.
...klick klack at SMPS ??...urgent!

Stereo mode (Surround is not tested)
the sound is clear and the power is for home use more than you need on small speakers. the sound is clear, less bass and not really deep in room holographic...not bad for some kids room the HS500 amp is recommended for 6 ohms speakers.

as written above the bass is really weak so my recommondation is for free standing speakers (KEF Q100, Sonus Faber 1.5, FR horn sepakers) set up the bass in the OSD at 4db or max 6db). the sound is not as good as an "old" Class AB amp eg. T+A2000 or an AVR from denon (e.g. 1803 or for sure not as my Arcam AVR390)...all avr are bi amping and bi wiring mode


souuround mode:
I read some remarks at the dynamic setup (minimum, medium, maximum) in sourround mode: the manual and the OSD show different names: i remember that is called dynamic range . minimum means no cahnges maximum dinamic range at low level listening.


Why i am not able to get more power like post 1 (e.g. 2,6ampere/ at 4ohms) i am not really sure what happend.... ????



thanks for your attention...i will finish this device...the kids have the small HS200 and waiting the get the "big one"

special thanks to EVA

cu
chris
Attached Files
File Type: pdf HS500_frequency_at 4ohm.pdf (54.6 KB, 2 views)

Last edited by chermann; 12th March 2018 at 09:07 AM.
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Old 13th March 2018, 07:02 AM   #29
chermann is offline chermann  Austria
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Join Date: Jan 2017
Location: Vienna
Wink ...really the last...

pic 1 how i measure the OUT + Voltage
pic 2 20hz
pic 3 clipping



this documents are the final "protocolls"


...thx
Attached Images
File Type: jpg HS500_ frequency response.jpg (251.1 KB, 16 views)
File Type: jpg HS500_20Hertz.jpg (228.4 KB, 16 views)
File Type: jpg HS500 clipping at 200hz.jpg (272.2 KB, 17 views)
Attached Files
File Type: pdf HS500 4 Ohm frequency response.pdf (54.8 KB, 2 views)
File Type: pdf HS500 8 Ohm frequency response.pdf (54.3 KB, 1 views)
File Type: pdf HS500_4_OCP.pdf (52.2 KB, 1 views)
File Type: pdf HS500_8_OCP.pdf (52.9 KB, 1 views)
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