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Old 11th February 2008, 02:15 AM   #1
Ipanema is offline Ipanema  Malaysia
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Default F2 with 12V supply

Hi Mr. Pass,

Since I enjoy your F2 amp so much, I'm planning to build one for my car. May I know how much power can I expect with 12V car battery? Or which other current source amp of your design is more suitable for low supply voltage? FYI, I'm planning to match it with Fostex Fe-126/7 speaker.

Thanks a lot.
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Old 11th February 2008, 04:11 AM   #2
winslow is offline winslow  United States
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You are going to have to build some sort of switching power supply to get the + and - rail voltages...or use 2 batteries and reference power the opposite on one of the batteries, but you couldn't listen and charge the batteries while driving.

That and I don't think you have the proper space for those drivers to get any kind of lowend from them.

But I'm more of a car audio guy than a home guy, and those are my 2 cents.
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Old 11th February 2008, 05:29 AM   #3
Ipanema is offline Ipanema  Malaysia
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winslow,

Agree that SMPS is a better solution, but I do not have the experience building that. I'm thinking of using F2 in bridge mode in order to increase the output power if there is no other suggestions coming in.

The fostex will only provide midrange and high frequency at the front. Subwoofer at the back will supply the low end grunt. Is this feasible?

May I know why fostex is seldom use in car audio?

Thanks.
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Old 11th February 2008, 06:46 AM   #4
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IRRC the F2 uses a single 24 V power supply. The reason Fostex is never used in automobiles is that they are designed to be used in single driver horn speakers.
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Old 11th February 2008, 07:13 AM   #5
Ipanema is offline Ipanema  Malaysia
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Hi kilowattski,

I'm aware that both are not designed for car use. I believe they will work in a car, but not sure how well will it be. But from replies, it doesn't sounds like a good idea.

Thanks.
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Old 11th February 2008, 09:59 AM   #6
Magura is offline Magura  Denmark
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Fe 166e has been used in horns in cars before with some success.


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Old 11th February 2008, 10:43 AM   #7
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I realy don't think the f2 will like operating on a 12 v supply.
Mosfets usualy need some voltage to operate best. If you look
at the capacitences of a mosfet they gets higher the lower
the drain source voltage and tend to get verry high below
6v.

I haven't heard of anyone building it but Andrew Cirnoff sp?
(one of my many spelling errors) had an interesting fet amp
for car use. It used an inductor as the current source. But
then geting a good 3a low dcr inductor at about 500mh is
another problem!
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Old 12th February 2008, 12:06 AM   #8
Ipanema is offline Ipanema  Malaysia
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I just browse through Passdiy website. It looks like ZV5 or Babo version of ZV5 might be suitable for use in 12V supply due to the almost rail to rail ouput swing. But I'm afraid that this design might clean up the 2nd harmonic that I so love in the F2. hhmm...dead end again...
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Old 12th February 2008, 12:32 AM   #9
winslow is offline winslow  United States
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I put Mini-A boards into my Monolithic A501 heatsinks and power supply. PS needed a lot more filtering but sounded good...not that the A501s were bad to begin with.

But I wouldn't recommend doing that to such a hard to find amp like the Monolithic.

Maybe find another car amp that has the rail voltages you need and use it for the PS?
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Old 12th February 2008, 12:34 AM   #10
Ipanema is offline Ipanema  Malaysia
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Good idea. Save alot of trouble this way. I'm heading to junkyard now...hehe..
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