I have one 7812 1A linear regulator, bunch of resistors and zeners at home.
My input voltage is 27VDC from two 12V lead batteries. Desired output voltage is 18V and the maximum current consumption of the connected device will be 100mA.
I'm considering using a zener diode at the GND pin of regulator.
What adjustment current trought the GND pin on regulator I have to expect?
Do i need the 1uF capacitor when using lead batteries?