Resistance needed to drop from 13VDC to 9VDC
Posted 04 April 2009 - 03:44 PM
I'm about to order the two caps suggested (10uF and 22uF) but I noticed that you can get these things with different voltage ratings. What voltage rating should I get? I'm thinking 16V should be fine, or should I go with 35V to be safe?
Posted 04 April 2009 - 10:11 PM
Posted 05 April 2009 - 08:09 PM
Posted 24 April 2009 - 03:14 PM
I measured the input at 13.1V and the output was exactly 9.0V. Perfect. Thanks again.
Posted 24 April 2009 - 06:47 PM
Would you mind making a little schematic of your setup with chip and capacitor numbers.
Posted 25 April 2009 - 12:45 AM
The "Red" wire is the unregulated input (pin 1), the "Black" wire is the ground (pin 2), and the "Yellow" wire is the output voltage (pin 3).
It really couldn't be simpler. With this setup, I guess I could just pull out the 7809 and replace it with another regulator (e.g. 7805 for 5V or 7812 for 12V) if I wanted to change the output voltage.