9v dc from a 12v ac transformer

[smiler]

Hi as you can guess by the question I am a novice at electronics, I need to know how can I build a unit to enable me to convert 12v ac to 9v dc I have a 240v doorbell transformer that gives me the 12v I take it that being it is 240v ac in it would be 12v ac out, how would I go about checking out if it was either ac or dc out put.
It it turned out to be 12dc I would still need to get it down to 9v to power a door entry system.
Can any one help please. :)

[ante]

Smiler,

Welcome to this community.

Yes it is possible, how much current (A) do you need?

Ante ::)

[smiler]

Hi Thanks for the reply 500ma would be fine.
Regards
Smiler :)

[ante]

smiler,

This is one simple way to go:
Here is a datasheet: http://www.elfa.se/pdf/73/730/07309016.pdf

Ante ::)

[Kevin Weddle]

There seems to be a misrepresentation in the voltage level. 12VAC after rectification has an average of 12V. Once you use the capacitor, the DC value becomes 17V.

[ante]

Kevin,

I don