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Type: Posts; User: Lira

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    Sticky: I'm working on some fixes that i found to make...

    I'm working on some fixes that i found to make this amplifier more stable. More updates soon.
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    This amplifier is not stable on todays ics, all thanks to counterfeit parts!

    From what i see on this amplifier, the schematic is a copy from the tda2030 datasheet with the modifications suggested on the datasheet for tda2050. I built a couple of this amplifiers, the sound is...
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    Hi! Can you post some pics of your assembly? ...

    Hi! Can you post some pics of your assembly? I'll be glad to help you.

    Best regards
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    Hi, i´m here to help too! I have a couple of this...

    Hi, i´m here to help too! I have a couple of this boards on an amplifier at my workshop. Post a cooper side picture, and detail all the problems that you have. By the way, you will need a good...
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    Sticky: I think the capacitor of 470uF in the VBE...

    I think the capacitor of 470uF in the VBE multiplier is causing the inicial DC, I lowered it to 47uF and it is better, but i always use a dc protect board with delay on the outputs. One thing that i...
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    Sticky: Sure! Here it is. 4736 If you find...

    Sure! Here it is.

    4736

    If you find something please tell me ok?

    Best Regards

    Lira
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    Sticky: I Erhan! Nice to see you here again Every new...

    I Erhan!

    Nice to see you here again
    Every new project you share is better than the last one.
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    Sticky: Here is an example using VBE Multiplier: 4734 ...

    Here is an example using VBE Multiplier:
    4734

    You can use this small board:

    4735

    and just put this instead of the 3 diodes, and replace the 470uf cap with a 100uf cap (C7 on the Schematic)....
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    Sticky: Update: It is finally stable. Here is the mods:...

    Update: It is finally stable. Here is the mods:
    This schematic is stable in simulation, but generates a lot of distortion in real life:
    4732
    First it will only be stable with 2v the collector of...
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    Sticky: Hi sir Vedmitra, yes, but no good news yet. What...

    Hi sir Vedmitra, yes, but no good news yet. What i found out is the first units of this amplifier i used bd911 and bd912 and now i'm using tip41 and tip42, and also, i used the bc327 instead of...
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    Sticky: UPDATE: I found some issues with new tips142/147,...

    UPDATE: I found some issues with new tips142/147, for some reason the last amplifier i mounted one week ago is not stable. I had this problem 1 year ago, the output is very distorted, the pnp...
  12. Sorry, because of problems with brazilian people...

    Sorry, because of problems with brazilian people copying the layouts and putting their own name, the forum has been redesigned, and a new forum is on the way. If you need any information you can talk...
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    Any Update?

    Any Update?
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    This design is well know, it is the Douglas Self...

    This design is well know, it is the Douglas Self Blameless amplifier.

    If you look on the internet there is a Brazilian guy who made an amplifier based in this amplifier , you can check it, it is...
  15. Thread: Jbl btx 250

    by Lira
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    Erhan, long time no see you! Are you ok? ...

    Erhan, long time no see you! Are you ok?

    Looking forward for your reply!
  16. Thread: Jbl btx 250

    by Lira
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    Do you have the lyt of the new crossover? ...

    Do you have the lyt of the new crossover?

    Thanks.
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    Sticky: Any update???

    Any update???
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    The link is broken, can you repost Thanks!

    The link is broken, can you repost Thanks!
  19. Thread: Jbl btx 250

    by Lira
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    I Want it ! :w):w)

    I Want it ! :w):w)
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    How do you calculate the R3 resistor? Thanks...

    How do you calculate the R3 resistor?

    Thanks for your attention.
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    Sticky: Hi, Can you take some more pictures of it??? try...

    Hi, Can you take some more pictures of it??? try to do a shortcut on the input and see if there is any tension on the output, something like 200mV is ok , but higher than this, check the BC`S. If you...
  22. Thread: Jbl btx 250

    by Lira
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    Hi Erhan, how can i contact you? I lost my msn...

    Hi Erhan, how can i contact you? I lost my msn...
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    Sticky: Você ja montou este amplificador? para você...

    Você ja montou este amplificador? para você conseguir 400w rms sobe a fonte para 37v + 37v (AC), se for usar apenas fonte de 28V + 28V pode até tirar 2 dos tips e trabalhar com apenas 2 pares por...
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    Sticky: There is two resistor inside the package, one of...

    There is two resistor inside the package, one of 150ohms and another one of 5Kohms, but it varies from one manufacturer to another, even with the part number of the same factory you find very...
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    Sticky: Simulators are not accurate when it comes to...

    Simulators are not accurate when it comes to darlington in package like the tips 142 and 147.
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