12volt to 1.5volt.

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Audioman013

Member - Posts: 5

Joined: July 10, 2005

Location: United States

Posted: July 11, 2005 at 8:50 PM / IP Logged

What size resistors do I need to achieve this? Do you think this is possible? Thanks for your help in advance.

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geepherder

Platinum - Posts: 3,668

This member consistently provides reliable information

Joined: October 27, 2003

Posted: July 12, 2005 at 6:56 AM / IP Logged

Yes you can do this with resistors, but it's not as simple as you may think. Any resistor can drop any voltage any given amount. It depends on the total resistance of the circuit, and a few other variables such as current and power demands. If you tell us what you're trying to do, I'm sure someone here can help you out much more. I pop my head in here when I can, but you'll find plenty of more helpful/knowledgeable members here.

My ex once told me I have a perfect face for radio.

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Audioman013

Member - Posts: 5

Joined: July 10, 2005

Location: United States

Posted: July 13, 2005 at 7:15 PM / IP Logged

I'm trying to hard wire an MP3 player on my buddys street bike. It uses only 1 AAA battery. If I can do this than we will use it or if not then he will get an iPOD. Thanks again.

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geepherder

Platinum - Posts: 3,668

Joined: October 27, 2003

Posted: July 13, 2005 at 8:19 PM / IP Logged

A simple bleeder resistor in series, with the mp3 player, and a zener diode rated at 1.5 volts will do it. I'm not great at explaining these things, so do a search on google for zener diodes.

My ex once told me I have a perfect face for radio.

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Audioman013

Member - Posts: 5

Joined: July 10, 2005

Location: United States

Posted: July 13, 2005 at 9:34 PM / IP Logged

Thanks.

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Ween

Platinum - Posts: 1,366

Joined: August 01, 2004

Location: Illinois, United States

Posted: July 13, 2005 at 10:54 PM / IP Logged

hi,

you might not find a zener rated at that low of a voltage. might be able to use a few 1A diodes in series instead. you'll need to know the current draw of the player also to set up the regulator circuit properly.

hope this helps,

mark

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Mad Scientists

Silver - Posts: 380

Joined: February 07, 2004

Location: United States

Posted: July 16, 2005 at 11:57 AM / IP Logged

Use a standard voltage regulator instead.. the problem with using a resistor bridge is that your input voltage does change; a zener diode is better, but uses more power.

Jim

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Evolution-UK

Copper - Posts: 192

Joined: June 19, 2005

Location: United Kingdom

Posted: September 18, 2005 at 6:26 PM / IP Logged

or buy a 12v multi-voltage adapter from your local electrics store.

http://www.maplin.co.uk/Module.aspx?ModuleNo=45348&doy=19m9D

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12volt to 1.5volt.

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