Does the preamp only work with a 9Vdc supply?
I would use a 7809 regulator. 100uF and 0.1uF 25v input to ground. 0.1uF output to ground. The ground is the tab and 2nd pin.No need for anything more complicated. In the example forget the bridge rectifier as that will be your battery input.
Design of 9 V regulator using 7809 with circuit diagram and schematics
I would like to run a 9vdc powered preamp with a 12v car battery.
thanks for your inputs guys, will try with this chinese thing.
thanks for advices and tricks ;-)
At the opposite of Chinese stuff what do you think about this one?
Rather expansive isn't it?
Forgot your link.
Remember that all of Apple's phones are made in China.