It is recommended to short the input, however, I did all my testing with input open and it worked equally fine. I used 1.3 amp bias, the heatsinks allow for more, but I'm not really crazy about pushing it.
Yes, I'm happy with a sound of F5 and that's the amp I'm presently using in a basement system.
Please see attached pic for my current setup. As mentioned earlier, the amps are behind the separating wall, in which Fertin drivers are installed. You will see battery driven (charger permanently in parallel) field coil supply.
There is no power switch directly on the amp, I installed it in a special housing on near cabinet wall.
Yes, I'm happy with a sound of F5 and that's the amp I'm presently using in a basement system.
Please see attached pic for my current setup. As mentioned earlier, the amps are behind the separating wall, in which Fertin drivers are installed. You will see battery driven (charger permanently in parallel) field coil supply.
There is no power switch directly on the amp, I installed it in a special housing on near cabinet wall.
Attachments
This is not my design, so I'm not selling them from my website, you can get the boards only through this Forum.
The instructions to purchase were explained in a first post of this thread: http://www.diyaudio.com/forums/showthread.php?postid=1771389#post1771389
The instructions to purchase were explained in a first post of this thread: http://www.diyaudio.com/forums/showthread.php?postid=1771389#post1771389
Yes, both F5 and F4 boards are available. No PS pcbs though, but it's so simple that p2p or veroboard method could be actually better than universal board.
As to comparison, I never built F4, so can't comment; regarding other amps, I expressed my views here: http://www.diyaudio.com/forums/showthread.php?s=&postid=1741265&highlight=#post1741265
As to comparison, I never built F4, so can't comment; regarding other amps, I expressed my views here: http://www.diyaudio.com/forums/showthread.php?s=&postid=1741265&highlight=#post1741265
looks like a regulated PS
Looks like a regulated power supply.
Look at the LM317 data sheet or in this case the LT 1086 data sheet, page 14, top right hand side.
Neat little circuit, use them a lot; but I like to use the protection diodes you will see on the top of page 10 of the 317 data sheet. Not sure about using huge output caps either.
Looks like a regulated power supply.
Look at the LM317 data sheet or in this case the LT 1086 data sheet, page 14, top right hand side.
Neat little circuit, use them a lot; but I like to use the protection diodes you will see on the top of page 10 of the 317 data sheet. Not sure about using huge output caps either.
ah
ah...yes. The biggest ones I have seen are the LM138 and LM338 which will give you 5 amps max.
I do not believe that this board is intended to power the F5. You rarely see these used in power amps for the reasons you have noticed- lack of current capability... maybe only in a gainclone or something like that. There are other boards for the F5 power supply I believe.
ah...yes. The biggest ones I have seen are the LM138 and LM338 which will give you 5 amps max.
I do not believe that this board is intended to power the F5. You rarely see these used in power amps for the reasons you have noticed- lack of current capability... maybe only in a gainclone or something like that. There are other boards for the F5 power supply I believe.
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