Hi,
I am making a hobby robot which will need power supply at 12v and 3.3v with low current (source is a battery at 12-24v). I am thinking using LM7812 and L78L33 to connect in series like this:
Vin -C1- LM7812 -C2->12v out-C3-> L78L33 -C4-> 3.3v out
Where C1 and C3=0.33uF capacitors; C2 and C4=0.1uF capacitors. The capacitors are based on the datasheet from LM7812 and L7833 when used individually.
My question is whether this circuit makes sense and do I need this many capacitors? Or is there a easier way to achieve the same (such as zener diode)? The 12v is for the Mosfet driver while the 3.3v is for the microcontroller.
Thanks in advance.
I am making a hobby robot which will need power supply at 12v and 3.3v with low current (source is a battery at 12-24v). I am thinking using LM7812 and L78L33 to connect in series like this:
Vin -C1- LM7812 -C2->12v out-C3-> L78L33 -C4-> 3.3v out
Where C1 and C3=0.33uF capacitors; C2 and C4=0.1uF capacitors. The capacitors are based on the datasheet from LM7812 and L7833 when used individually.
My question is whether this circuit makes sense and do I need this many capacitors? Or is there a easier way to achieve the same (such as zener diode)? The 12v is for the Mosfet driver while the 3.3v is for the microcontroller.
Thanks in advance.