Interesting, sounds like the IRF is NOT prefered over the Fairchild devices.
Unless I hear otherwise, I will assume people here are going with the Fairchild parts. I will continue with the F5 thread, on page 180.
Thanks again,
Russellc
You will find that info in the first post of this thread: http://www.diyaudio.com/forums/showthread.php?t=140306
From what I read, I think I do prefer IRFs: http://www.diyaudio.com/forums/showthread.php?postid=1725328#post1725328 and that's what I used.
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Joined 2002
The Tech-DIY resistors kit will work with my boards, although with some modifications: http://www.diyaudio.com/forums/showthread.php?p=1726082
I'd rather recommend Vishay/Dale CMF50 resistors from DigiKey: http://dkc3.digikey.com/PDF/C091/P1890.pdf and for 3W power resistors either blue Panasonics (DigiKey) or Mills 5W (Percy or Partsconnexion)
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Joined 2002
This is a GC of Class A amps, it will work with lower rails, it's good with everything, especially ribbon tweeters
Sweet, i sent you a pm peter. Via your website.!
See this
http://www.imgx.org/public/view/full/19271
An externally hosted image should be here but it was not working when we last tested it.
The power resistors go on the other side of the board...
Thanks guys, I think I'm clear on parts choices now. Peter, I received two power supply boards that appear to have two power supplies each, did I receive an extra accidentally, or are all 4 required? Seems like I recall a post with pic showing how all this (power supply and amp cards) hooked together.
I think I'm going thread blind from building this and a 45 tube amp at the same time! Thanks for the patience with this old tube man! Any pics of how the 4 boards wire to the amp cards would be appreciated, obviously I was mistaken in how I thought it went..... And by quite a bit!
Russellc
I think I'm going thread blind from building this and a 45 tube amp at the same time! Thanks for the patience with this old tube man! Any pics of how the 4 boards wire to the amp cards would be appreciated, obviously I was mistaken in how I thought it went.....
And by quite a bit!Russellc
See this
http://www.imgx.org/public/view/full/19271
An externally hosted image should be here but it was not working when we last tested it.
The power resistors go on the other side of the board...
Nice shot! Should keep me from reversing the transistors!
russellc
The amp requires symmetrical supply (+/-V). Each PS board supplies both positive and negative voltage, and you can use one per channel (separately).
The PS boards have been explained here: http://www.diyaudio.com/forums/showthread.php?t=149672
Attachments
Very clear on the power supply Peter. Have ordered parts from Tech-DIY, the kit with the Vishay/IRF devices, per your recommendation. As they will be on leads, I suppose I could try both without danger to "over soldering" the board.
Likely it will live with whatever parts are first installed and work.
Thanks for the info on the use of your boards, much appreciated.
Once the amp, PS, and rectifier boards are populated, the hunt will be on for heatsinks and transformers. Hopefully a donor amp box will happen buy, I'd like this project to avoid my usual "Frankenstein Laboratory" DIY style.
Russellc
Likely it will live with whatever parts are first installed and work.
Thanks for the info on the use of your boards, much appreciated.
Once the amp, PS, and rectifier boards are populated, the hunt will be on for heatsinks and transformers. Hopefully a donor amp box will happen buy, I'd like this project to avoid my usual "Frankenstein Laboratory" DIY style.
Russellc
Banned
Joined 2002
Very clear on the power supply Peter. Have ordered parts from Tech-DIY, the kit with the Vishay/IRF devices, per your recommendation. As they will be on leads, I suppose I could try both without danger to "over soldering" the board.
Likely it will live with whatever parts are first installed and work.
Thanks for the info on the use of your boards, much appreciated.
Once the amp, PS, and rectifier boards are populated, the hunt will be on for heatsinks and transformers. Hopefully a donor amp box will happen buy, I'd like this project to avoid my usual "Frankenstein Laboratory" DIY style.
Russellc
How much were your parts from tech diy ?
Seems like it was 60 for 2 channels. A buck or 2 more for the kit with the Fairchild devices.
Russellc
Yes, I have plenty of boards in stock, also PS boards.
Those are Caddock MK132 (grey) and Vishay S102 (black). Both available from Percyaudio.com, although a bit pricey.
Those are Caddock MK132 (grey) and Vishay S102 (black). Both available from Percyaudio.com, although a bit pricey.
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