sell your car
buy a house with big living room
make big spks
make just two channel F5
it will roooooom!
or - think about best way of having at least +/-15V as power supply for amp(s) ...... in car
that's twice 15V ..... conveniently connected
for home work :
what's difference between AC and DC
for which current xformers are effective and intended
Thanks. I changed transformer to voltage multiplier.
I could make a virtual CT to get the split rails, but I'm not sure the components generally used could handle the current.
But maybe that's why the chip amps are so popular in car audio now.
you need switcher PSUs for that
but - if you ask me - you can hardly hear difference between A class and D class - in car
but - if you ask me - you can hardly hear difference between A class and D class - in car
Yeah, I can get a decent 6-ch MB Quart for $200 so I'll keep the F5 as intended and just buy a couple MB Quart amps.
I think he meant current Class AB and good Class D. 😉
The MB Quarts are Class AB, but will probably need mods. Panasonic or Silmic caps in PS, any op-amps, and maybe output transistors too.
I liked the idea of having a few watts of Papa Class A power without having to hunt for his Soundstreams. Sigh.
So did i.
Anything but Class D for a subwoofer is nuts, but Class AB amps in cars still sound better, preferably high bias.
Car acoustics always suck though, i have a back window open when i drive alone, summer and winter.
The joy of having neighbors who love to compete with the latest posh car models is a 365 day car show up your alley.
No30 drove a Continental GT before, got the Porsche 4-seater months before the official sale date overhere.
Burmester Panamera surround system, AB amps + Class D for the sub (excuse my fatness)=>
Attachments
after a year and half and numerous interruptions with other DIY projects, i finally finished my F5. it's basically "stock" with 132,000uF in the remote PS and another 44,000uF in the amp proper. biasing at 1.3A with 0V DC offset was simple enough too.
i don't need to wax about how great this amp is - everyone that has built one knows. my B1/F5 combo is driving a pair of uFonken^2, with a pair of Fostex FF85K per side. it also drives my AKG K702 headphones beautifully as well.
a huge thanks to Nelson Pass for making this project possible and for sharing his passion and knowledge for the benefit of the DIY community
.
here's some pics: http://www.diyaudio.com/forums/pass-labs/166784-pictures-your-diy-pass-amplifier-36.html#post2332027
i don't need to wax about how great this amp is - everyone that has built one knows. my B1/F5 combo is driving a pair of uFonken^2, with a pair of Fostex FF85K per side. it also drives my AKG K702 headphones beautifully as well.
a huge thanks to Nelson Pass for making this project possible and for sharing his passion and knowledge for the benefit of the DIY community
.here's some pics: http://www.diyaudio.com/forums/pass-labs/166784-pictures-your-diy-pass-amplifier-36.html#post2332027
Anyone tried these cheapo bridge rectifiers yet?
BRIDGE RECTIFIER KBPC5010 1-PHASE FULL-WAVE 50A 1000V - eBay (item 150493795299 end time Oct-15-10 04:50:07 PDT)
BRIDGE RECTIFIER KBPC5010 1-PHASE FULL-WAVE 50A 1000V - eBay (item 150493795299 end time Oct-15-10 04:50:07 PDT)
Good point. However, I'll just be using them for an F5. I'm concerned about diode noise, premature failure etc. I imagine all bridge rectifiers are made overseas these days.
Funny you ask about them. I ordered some Mica T0-247 insulators from Hong Kong last night and he had those rectifiers also. I figured what the hell, they are $1.88 so I got 2 to try.
Be few weeks before they come, but we shall see.
Here is the spec sheet on them. They are from SEP electronics.
Chad
Be few weeks before they come, but we shall see.
Here is the spec sheet on them. They are from SEP electronics.
Chad
Power supply question. So I'm in the planning process for a balanced F5's (mono blocks). I have (4) of cviller's boards and I'm wanting to populate the second pair of output FETs to allow for trying higher bias's. I'm looking to "beef up" the power supply by maybe using a single P/S board (standard layout per Nelson's schematic) to run each F5 board (overkill?).
Do you guys see any potential issues with the FX5 layout and doing something like this?
Do you guys see any potential issues with the FX5 layout and doing something like this?
An Xed amplifier benefits to be supplied commonly.(one PSU only)
To deliver the full power into 8 ohm class A, you need to bias each board at 2.6A. Because a bridged amplifier sees half the real load. That means four times the dissipation compared to a regular F5 channel.
The psu (transformer and capacitance) has to follow this requirement.
Or lower the rails voltage. Or accept to leave class A at medium power.
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I was planning to use a 750 -1000 VA transformer per mono-block. From some of the reading I did in this thread, it sounds like people recommend at least 60,000nF per rail for the standard stereo setup.
If I wanted to run dual output devices at the standard 1.3A bias, seems like you would simply double the capacitance in the power supply (more/larger capacitors).
If I wanted to run dual output devices at the standard 1.3A bias, seems like you would simply double the capacitance in the power supply (more/larger capacitors).
it's pretty impossible that someone is so stupid to think about 60 x 10^-6 F in A class amp PSU .
AndrewT is sometimes too serious .
AndrewT is sometimes too serious .