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Old 16th September 2012, 10:31 PM   #1
Rixsta is offline Rixsta  United Kingdom
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Default Class A Amp, in Car-Caravan

Hi

Ok, Im looking at building a new amp and id like it to be able to run ideally from a 12v car battery, Ive Built the Zen V4 (lovely!) and the F5 for a friend (more lovely!) Ok so for the questions! on a 12v class A

Is this possible ? will it drain the battery too much ? (i would use a separate battery perhaps)

How about the Mini Aleph ? does anyone have a best place to buy for price ?
how about the ebay clones like this one ? id prefer to find more legitimate versions!

would Aleph-M sound ok at 12v ?

Do i need any extra filtering other than caps ?

As you can tell Ive loved the Nelson Pass sound, so wish to continue down this road, me and the lady are going to live traveling so out with the mains and in with the battery/solar power

the only other option I have found is here "Andrea Ciuffoli:Class a car"
as you can see Ive Pretty much made my mind up on the Aleph-M just thought id double check with the pros here to see if there are better ideas and if my idea is insane or perfectly doable!

Thanks Riki
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Old 16th September 2012, 10:48 PM   #2
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Jean Hiraga's Le Monstre Class A amp

The Class-A Amplifier Site - Hiraga 'The Monster'

"two large 40 A/h batteries........The batteries can be used as the only power supply source, but take heed, the endurance hardly exceeds a few hours, lead-acid batteries are sensitive to deep discharges and their lifespan depends on this, so 12.2V is a lower limit that, above all, should not be exceeded"
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Old 16th September 2012, 11:50 PM   #3
Zen Mod is offline Zen Mod  Serbia
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Hiraga amp demands bipolar supply
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Old 17th September 2012, 12:02 AM   #4
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So how did Hiraga do it on batteries alone?
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Old 17th September 2012, 12:11 AM   #5
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2x12V batteries in series of course. but that will be hard to do in a car with 12V system.
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Old 17th September 2012, 12:13 AM   #6
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maybe a JLH 10W 69 version can be used. that is single rail amp.
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Old 17th September 2012, 12:57 AM   #7
winslow is offline winslow  United States
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I built a MiniA for the car using another existing amp's split rail power supply.

It had a ton of noise, needed some filtering on the outputs.
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Old 17th September 2012, 01:06 AM   #8
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you can also use a SMPS DC-DC supply for car amps. then you will stand a little more free regarding supply voltage.
i'm thinking about this for a F5 as car amp wich may be a better choise if you are using 4ohm speakers.
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Old 17th September 2012, 07:47 AM   #9
AndrewT is offline AndrewT  Scotland
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12Vdc will limit the maximum output of the amplifier to <11Vpp.
Into 4ohms, the maximum power will be < 5.5Vp^2 / 4r0 / 2 ~ 3.7W

Would be great for a headphone amplifier. They get 90dB to 110dB per mW whereas speakers are around 80 to 100dB/W. Yes, speakers typically need 100times more power.
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Old 17th September 2012, 08:49 AM   #10
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its not un-usual for car speakers to be 92db-94db. so for listening level that will be fine.
thats almost 98-100db.
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