12v to 9v converter
 

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[Closed] 12v to 9v converter

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From what I remember of my GCSE Electronics would suggest you need a Potential Divider.

https://en.wikipedia.org/wiki/Voltage_divider

Two resistors, total cost about three pence.


 
Posted : 29/09/2016 6:55 pm
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That only works if you also know how much current the radio takes, which will change 🙁

Looks like this sort of thing but you need to check the power raying

https://www.amazon.co.uk/gp/aw/d/B01J4A9HMI/ref=mp_s_a_1_fkmr0_2?ie=UTF8&qid=1475175634&sr=8-2-fkmr0&pi=AC_SX236_SY340_QL65&keywords=12v+ti+9v+converter+car


 
Posted : 29/09/2016 6:59 pm
 m0rk
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^^ or a voltage regulator if the output voltage is a bit more sensitive (12V from a car can be 14.4 on a good day, and quite messy)


 
Posted : 29/09/2016 7:01 pm
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That's the ticket Leffeboy, cheers.
I have no idea what everyone else is talking about which is why that although thruppence is cheap enough I'm happy to pay a tenner for someone else to put it together. 😀


 
Posted : 29/09/2016 7:08 pm
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From what I remember of my GCSE Electronics would suggest you need a Potential Divider.
> https://en.wikipedia.org/wiki/Voltage_divider

Two resistors, total cost about three pence.

As above they only really work when you need to divide the voltage for something that takes no current and are fed from a fixed voltage supply.

I have used these buck converter boards for doing similar. Again you would need to check the required output current.

http://www.ebay.co.uk/itm/262367320918

I can't even buy the parts to make them in the uk for that price which is rather annoying...


 
Posted : 29/09/2016 9:57 pm
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I've a vague handle on electronics but I do so wish it was better. I'm not silly, but I follow a retro computing group on Facebook and the skill of the guys doing repairs on there just breaks my head.


 
Posted : 29/09/2016 10:16 pm
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I've a vague handle on electronics but I do so wish it was better. I'm not silly, but I follow a retro computing group on Facebook and the skill of the guys doing repairs on there just breaks my head.


 
Posted : 29/09/2016 10:17 pm
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Maplin sell the car adapters if you want to go in a shop.


 
Posted : 30/09/2016 5:51 am

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