Class A amp in car

shelter · 24th July 2008, 03:46 PM

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

AndrewT · 24th July 2008, 03:57 PM

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.

woody · 24th July 2008, 04:08 PM

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.

shelter · 24th July 2008, 08:38 PM

tks AndrewT and woody.

anyone know a good circuit
or have made one class a for a car?

Perry Babin · 24th July 2008, 10:26 PM

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.

69CamaroSS396 · 24th July 2008, 10:36 PM

http://www.diyaudio.com/forums/showt...01#post1543601

jacco vermeulen · 24th July 2008, 10:48 PM

Utter bullocks.

winslow · 28th July 2008, 04:29 AM

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.

MOER · 28th July 2008, 05:27 AM

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

__________________
I refuse to spend $10 on a resistor that does not make a significant audible or measurable improvement.

jacco vermeulen · 28th July 2008, 09:02 AM

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.

24th July 2008, 03:46 PM	#1
shelter diyAudio Member Join Date: Jul 2008	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

24th July 2008, 03:57 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

24th July 2008, 10:26 PM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

28th July 2008, 05:27 AM	#9
MOER diyAudio Member Join Date: Aug 2003 Location: SIMI VALLEY CA	Class A in a car What is "utter bullocks"? Post #7 Utter bullocks. __________________ I refuse to spend $10 on a resistor that does not make a significant audible or measurable improvement.

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24th July 2008, 04:08 PM	#3
woody diyAudio Member Join Date: Jan 2002 Location: Tyrone Ga. U.S.A.	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.

24th July 2008, 08:38 PM	#4
shelter diyAudio Member Join Date: Jul 2008	tks AndrewT and woody. anyone know a good circuit or have made one class a for a car?

24th July 2008, 10:36 PM	#6
69CamaroSS396 diyAudio Member Join Date: Jan 2006 Location: Central Ohio	http://www.diyaudio.com/forums/showt...01#post1543601

24th July 2008, 10:48 PM	#7
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Utter bullocks. __________________ Looks like Sponge Bob has killed another thread.

28th July 2008, 04:29 AM	#8
winslow diyAudio Member Join Date: Aug 2005	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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