Circuit board 2

Components for this circuit board:

R1= 270 ohm 0.25w resistor
R2= 820 ohm 0.25w resistor
R3= 150 ohm 0.25w resistor
Zener diode, 22 volts.
2 x diodes

L.e.d
Voltage regulator LM317T
2 x Capasitors 25 volts 33 mF

The circuit is a voltage regulating circuit the voltage regulator does two things: it regulates output voltage to 5V and makes one positive input into two different positive inputs, One of them is a 12V constant power supply and the other is a 5V constant power supply, So it is able to have a 12V power supply but then regulate this down to give a 5V output for our aux. which requires 5V.

I found that this circuit board was harder then the first due to not completely understanding the components throughout it, once i worked out the resistors to use using the website, things went alot easier and ended up with a final result of a 5.17V output after tweaking a few things as my first test read 5.45V...to get it down to the 5.17V i had to change a resistor from a 220ohm to a 270ohm this is what got me into the le-way of 5V-5.19V.

If i was to remake this circuit board again I would make it more compact and tidy so that wires and components weren't crossing each other as this can cause shorting etc....