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Thread: 300WPC DIY amp kit $18.99

  1. #1
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    ---I run with Scissors

    300WPC DIY amp kit $18.99

    Fun mail today. I thought I'd get some practice in before working on anything I cared about. This should really rock my Bose 901's!!Click image for larger version. 

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ID:	30053 http://www.ebay.com/itm/DIY-Transist...72.m2749.l2648Click image for larger version. 

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  2. #2
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    I didn't know Sri Lanka was a hotbed of DIY amp activity....
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

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    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

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  3. #3
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    Halfbiass...Electron Herder and Backass Woof
    I didn't see a transformer....
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  4. #4
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    Quote Originally Posted by laatsch55 View Post
    I didn't see a transformer....
    No transformer. They don't ship well in an envelope! But the power supply board & caps are included free. Needs 9-12V AC .

  5. #5
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    Halfbiass...Electron Herder and Backass Woof
    No, you née 60 volt center tapped secondary transformer, BEFORE rectification. That gives you +/- 42 volts on the rails...
    taking something that's already good, and making it better...........and for the knowing smiles that cross their faces.......Nando-2011...

    "Silence cannot be Misquoted"--Lazarus Short-2012 "

    " I Just Collect Smiles Craig......Cheap Smiles!-----Fishoz-2017

    "anything can be done, it's finding the easiest way that's hard"-----Bobbysdad--2014

    " Synth percussion is deadly to children, house pets and shitty power supplies"---Stephen Evans 2014

    " You have not reached the point of diminishing returns, you've just ran out of money

    " The Pioneer U-24, unfortunately, is just too expensive and rare to find. That's why I have one."--Nando-2014

  6. #6
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    Quote Originally Posted by laatsch55 View Post
    No, you née 60 volt center tapped secondary transformer, BEFORE rectification. That gives you +/- 42 volts on the rails...

    Sorry , I was thinking of the eight dollar amp kit I got from China the day before! I need more coffee & to think before posting.
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    Last edited by Bradrock; 08-19-2017 at 09:45 AM.

  7. #7
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    Quote Originally Posted by Bradrock View Post
    .... This should really rock my Bose 901's!!...
    . Looks like it will, since it has no volume control. Don't forget a preamp or add an attenuator to the input, like:
    http://www.mouser.com/ProductDetail/...Qsg609DLUag%3d

  8. #8
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    Quote Originally Posted by Netfly View Post
    . Looks like it will, since it has no volume control. Don't forget a preamp or add an attenuator to the input, like:
    http://www.mouser.com/ProductDetail/...Qsg609DLUag%3d
    Thank you & yes I'm shopping for under ten dollar preamp now. Im not an audiophile, so I NEED tone controls.

    Like this:http://www.ebay.com/itm/NE5532-OP-AM....c100005.m1851
    Last edited by Bradrock; 08-19-2017 at 10:01 AM.

  9. #9
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    Very nice for the price. The NE553x is a very good sounding Op-amp, used in a lot more expensive gear like the SAE 2900 I use.
    http://www.ebay.com/itm/SAE-2900-Pre...oAAOSwyltZVmX-

  10. #10
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    Also suggest you use a 15w soldering iron. Like:

    http://www.ebay.com/itm/Weller-SP15NUS-Soldering-Iron-3-LED-Illumination-15W-120V-/382098270038?epid=1721850123&hash=item58f6d4e756:g:wDwAAOSwX9FZJSq~

    I prefer the old thin blue one without the LEDs, but I don't see it around atm.

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