Car battery, good idea?

jev · 27th September 2007, 07:02 PM

I have several boxes that work on 12 or 9 Volts:
1-Leach mc (twice 9V)
2-Shek dac d2 (12V)
3-Record player Scheu (9V)

Now I was consdering battery powering these devices. But I was wondering If I use a car battery in combination with small isolation transformers and small stepdown transformers (custom made probably). I would then have a lot of amperes, only one battery to charge. The transformers would isolate the devices and stepdown the voltage to 9 Volts?

Will this work?

Don S · 27th September 2007, 08:02 PM

Transformers only work on AC, not DC. You could use resistors or regulators to reduce the voltage and isolate the devices. If you have the charger connected and operating while using the devices, you will see no benefit in noise reduction. You will probably have more noise than the dedicated power supplies for the units.

Thanks, DonS

jev · 28th September 2007, 06:38 AM

Thanks Don S, I forgot about the dc-ac thing...

gni · 28th September 2007, 02:35 PM

Just use 3 pin voltage regulators. . . the output is isolated.

27th September 2007, 07:02 PM	#1
jev diyAudio Member Join Date: Jan 2005 Location: Utrecht	Car battery, good idea? I have several boxes that work on 12 or 9 Volts: 1-Leach mc (twice 9V) 2-Shek dac d2 (12V) 3-Record player Scheu (9V) Now I was consdering battery powering these devices. But I was wondering If I use a car battery in combination with small isolation transformers and small stepdown transformers (custom made probably). I would then have a lot of amperes, only one battery to charge. The transformers would isolate the devices and stepdown the voltage to 9 Volts? Will this work?

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27th September 2007, 08:02 PM	#2
Don S diyAudio Member Join Date: Nov 2006	Transformers only work on AC, not DC. You could use resistors or regulators to reduce the voltage and isolate the devices. If you have the charger connected and operating while using the devices, you will see no benefit in noise reduction. You will probably have more noise than the dedicated power supplies for the units. Thanks, DonS

28th September 2007, 06:38 AM	#3
jev diyAudio Member Join Date: Jan 2005 Location: Utrecht	Thanks Don S, I forgot about the dc-ac thing...

28th September 2007, 02:35 PM	#4
gni diyAudio Member Join Date: Sep 2006	Just use 3 pin voltage regulators. . . the output is isolated.

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