9v output instead of 5v?

Hi,

I loved the article on building power supplies but I would like to have a 9 volt output ( to substitute a 9v battery). This is a lot more common than 5v in some modern circuits.

Which components would I have to change?

Posted by link21 on 24/03/2004, at 17:51 GMT

Changing the regulator

Glad you enjoyed the article!

To get a 9V supply, all you need to do is swap the 7805 regulator for a 78S09. It is a straight swap as the pinouts are the same.

If the circuit you are powering will consume more than 1A, you will also have to upgrade the four rectifier diodes to 1N4500's or similar.

There is more information about the types of regulator available for different voltages at:

http://www.eleinmec.com/article.asp?20

Posted by Tim Surtell on 25/03/2004, at 22:18 GMT

Wow! Thanks :)

Thank you so much for your prompt reply,

Will the 1N4500 diodes be ok for circuits that consume less than 1A? this would allow more flexibilty from just a single psu...

Also : Is it safe to run 2 power supplies in parallel off a single mains supply..I want to add a 9 volt power supply (internally) to my sony playstation. it uses a standard figure 8-type cable that leads to its own internal psu.I want to take a feed from this and run my own psu in parallel.

I understand that it would be simpler to use a seperate mains supply but I want to learn how to achieve this for other projects too and am exercising a high-level of safety protocols as one should always do when working with mains supplies.

Thanks again for all of your help. I will be reccomending your site to friends as it is one of the best that I have ever come across for this type of information.

Link21.

Posted by link21 on 03/04/2004, at 13:05 GMT

update to last message

Just realised the ammount I can draw is all down to the transformer (quote : If the input voltage is 9V AC, you will be able to draw 1A from the power supply. For the maximum input voltage of 35V you will be able to draw 0.1A.)

I want to emulate a common rectangular 9volt battery (size pp9/pp3? sometimes known as mn1604 or 6lr61).

Posted by link21 on 03/04/2004, at 13:58 GMT