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Old 28th May 2019, 01:44 PM   #831
bambadoo is offline bambadoo  Norway
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Sorry fake. They are different animals that those you pictured in your former post.
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Old 28th May 2019, 01:58 PM   #832
shaan is offline shaan  India
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Quote:
Originally Posted by cejas99 View Post
Hello friends
I apologize for my bad English, since it is not my native language.
I need your valuable help to know if the transistors of the attached photo are genuine Hitachi? or are they fakes? or is it better to buy the Renesas?
Thank you very much for your answers
Probably fake.

Quote:
Originally Posted by cejas99 View Post
Yes, I bought them recently
Definitely fake.

Original: Check attached picture.
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File Type: jpg IMG_20190528_192523~2.jpg (575.4 KB, 206 views)
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Old 28th May 2019, 03:00 PM   #833
cejas99 is offline cejas99
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Quote:
Originally Posted by shaan View Post
Probably fake.



Definitely fake.

Original: Check attached picture.
Shaan thank you very much for your answer , I will return the fake transistors
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Old 30th May 2019, 02:31 PM   #834
bambadoo is offline bambadoo  Norway
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Hi again. I am sure it has been said like 1000x times before.
What rating should mains fuse have? (2 channels)
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Old 30th May 2019, 03:02 PM   #835
delange is offline delange  Belgium
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Originally Posted by bambadoo View Post
Hi again. I am sure it has been said like 1000x times before.
What rating should mains fuse have? (2 channels)
You'll find the ratings on the documentation of your transformer.
This is a sample documentation of a 300VA transformer: http://www.amplimo.nl/images/downloa...ange/78026.pdf
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Old 31st May 2019, 08:43 AM   #836
delange is offline delange  Belgium
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Hello Shaan,

Short question: I managed to solder the LED's the wrong way (both of them); silly me :-)
In the mean time I have corrected that mistake and the LED's light up when I start the setup procedure. However, the amp seems non responsive. It is not drawing any current at all. I'm using a dual 55 volts supply (currently with two 1 ohm resistors in the power rails).

Do you think that I might have blown any transistors by reversing the LED's?
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Old 31st May 2019, 08:45 AM   #837
shaan is offline shaan  India
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Quote:
Originally Posted by delange View Post
Hello Shaan,

Short question: I managed to solder the LED's the wrong way (both of them); silly me :-)
In the mean time I have corrected that mistake and the LED's light up when I start the setup procedure. However, the amp seems non responsive. It is not drawing any current at all. I'm using a dual 55 volts supply (currently with two 1 ohm resistors in the power rails).

Do you think that I might have blown any transistors by reversing the LED's?
Are both PGND and SGND properly connected to ground?
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Old 31st May 2019, 08:54 AM   #838
delange is offline delange  Belgium
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Originally Posted by shaan View Post
Are both PGND and SGND properly connected to ground?
Yes, they are connected to power supply gnd by means of two different wires.
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Old 31st May 2019, 09:10 AM   #839
shaan is offline shaan  India
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Have you tried turning VR1/2?
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Old 31st May 2019, 09:49 AM   #840
delange is offline delange  Belgium
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Originally Posted by shaan View Post
Have you tried turning VR1/2?
No not yet.
I found it to be strange that the voltage across R25 is 0 volts and the voltage across one of the 1 ohm resisters is only 0,004 volts.
I'm guessing that is not normal?
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