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How do you reduce voltage from 12 volt to 9 volt?
Blanka:
Use a 7809 voltage regulator with a heatsink. It can handle 1 or 1.5 ampere, depending on the model.
http://nl.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=5164812
Oops: READ, it says AC
BUT,
9 V AC is often regulated to 12V DC. Amplifiers always run on DC. Make a picture of the circuitboard.
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