Influence of the delay amplifiers for listening characteristics - Page 68

PMA · 13th April 2010, 04:09 PM

Quote:

Originally Posted by Federmann

Current limit is more than 13A?

Yes. It is determined by F4A fuses

Federmann · 13th April 2010, 04:17 PM

Quote:

Originally Posted by PMA

Yes. It is determined by F4A fuses

OK Pavel!
But the current no limitation on amplifier.

PMA · 13th April 2010, 04:32 PM

This amplifier is only for me and for my purposes. The current is limited only by PSU and fuses, and paralleled transistors have such SOA that they withstand short circuit (tested), with quite low supply voltage used.

If I built that amplifier for a customer, it would have a current protection circuits. Now it is just a research stage

PMA · 13th April 2010, 04:52 PM

Bohumil,

I have made a research test, just for you. 10Hz sine with gradually increasing amplitude, into 0R22 load. You can see the peak current when the power supply rail fuse has blown, it is about 20A peak

Federmann · 13th April 2010, 05:10 PM

When will the next amplifier, I also do interesting tests.

Federmann · 13th April 2010, 05:38 PM

Quote:

Originally Posted by Sendy

400Hz sinewave, 80% output voltage with no load and with load 0,1 ohm, 5-10 sec duration.

Quote:

Originally Posted by Federmann

To the impossible!
Current will be limited to less than 20A. Voltage on the load will be less than 2V. After a few ms off fuse!

Apply what I wrote.

Sendy · 16th May 2010, 06:41 PM

Quote:

Originally Posted by Federmann

When will the next amplifier, I also do interesting tests.

Hi Federmann, what about testing your "overcurrent protection" ? Now you have a new piece of amplifier, what about measuring ?

Federmann · 30th July 2011, 09:55 PM

Measurements up to 200mΩ.

Federmann · 30th July 2011, 09:57 PM

Measurements up to 500mΩ.

13th April 2010, 04:32 PM	#673
PMA diyAudio Member Join Date: Apr 2002 Location: Prague, Kitakyushu, Fukuoka	This amplifier is only for me and for my purposes. The current is limited only by PSU and fuses, and paralleled transistors have such SOA that they withstand short circuit (tested), with quite low supply voltage used. If I built that amplifier for a customer, it would have a current protection circuits. Now it is just a research stage __________________ Pavel Macura, consultant http://cz.linkedin.com/pub/pavel-macura/4/783/637

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13th April 2010, 05:10 PM	#675
Federmann diyAudio Member Join Date: Oct 2009 Location: Kunovice - Moravia	When will the next amplifier, I also do interesting tests.

30th July 2011, 09:55 PM	#678
Federmann diyAudio Member Join Date: Oct 2009 Location: Kunovice - Moravia	Measurements up to 200mΩ.

30th July 2011, 09:57 PM	#679
Federmann diyAudio Member Join Date: Oct 2009 Location: Kunovice - Moravia	Measurements up to 500mΩ.

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