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Old 24th July 2008, 04:46 PM   #1
shelter is offline shelter  Azores
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Default Class A amp in car

i need to know if this circuit is possible to work in a car with a 12 volts battery ?

http://diyaudioprojects.com/Solid/ZCA/ZCA.htm
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Old 24th July 2008, 04:57 PM   #2
AndrewT is offline AndrewT  Scotland
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yes,
but you'll not hear much since it puts out 2.5W into 8ohms from +24Vdc.
into 4ohms from 12Vdc it will manage less than 1/3W.

But if you try replacing the 15r with a 2A to 3A CCS you may find it will drive 4ohm speakers to some volume.
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Old 24th July 2008, 05:08 PM   #3
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I know I am murdering the spelling here but Andrew Curnoff
had an amp on his web page designed for car use. It used
an inductor as the load in the drain circuite but the high curent
low dcr inductor would be hard to find and expensive.
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Old 24th July 2008, 09:38 PM   #4
shelter is offline shelter  Azores
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tks AndrewT and woody.

anyone know a good circuit
or have made one class a for a car?
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Old 24th July 2008, 11:26 PM   #5
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A true class A amplifier in an automobile will draw significant current at all times. Are you sure you want a class A?

A high biased, class AB may be a better option.

If you want class A, try the Pass Labs forum. Someone there should be able to suggest a circuit.
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Old 24th July 2008, 11:36 PM   #6
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http://www.diyaudio.com/forums/showt...01#post1543601
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Old 24th July 2008, 11:48 PM   #7
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Utter bullocks.
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Old 28th July 2008, 05:29 AM   #8
winslow is online now winslow  United States
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I put the infamous Mini-A boards in a pair of Monolithic A501 heatsinks. The PS needed some filtering with the Mini-A boards (the Monolithic boards had filtering on them).

Right now I am (will be) using my HSS Fidelity HT230 on my horns...class A tube amp for the car.
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Old 28th July 2008, 06:27 AM   #9
MOER is offline MOER  United States
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Default Class A in a car

What is "utter bullocks"?
Post #7
Utter bullocks.


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Old 28th July 2008, 10:02 AM   #10
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Quote:
For an amplifier to be classified as “Class A” it is required that the standing current in the output stage be equal to or greater than the maximum load current.
This is bullocks.
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