Scullcom Hobby Electronics #21 - Design & Build 5 Volt Reference Standard

This project is for the hobbyist to design and build a 5 volt precision voltage reference standard that requires no adjustment but still has an accuracy of ±0.01% or better and a temperature coefficient of ±3 ppm/ºC. Also incorporating an auto switch-off and battery monitor feature.
PARTS LIST:
1 x Intersil ISL21009BFB850Z, Precision 5V Voltage Reference ±0.5mV 3ppm/ºC.
1 x SOIC8 to DIL8 IC Adapter PCB SMD Converter Board + Pin Headers (find on eBay).
1 x IRF9630 - 'P' Channel MOSFET.
1 x 2N3904 - General NPN transistor.
2 x 5v6 1.3w Zener Diode.
1 x Kingbright 5mm Red/Green LED Tricolour Clear (Manufacturer Part No: L-59EGC).
5 x 1Kohm Resistors (either 1% or 5%).
1 x 10Mohm Resistor (either 1% or 5%).
1 x 10uF 25V Electrolytic Capacitor.
1 x 10uF (16v or 25V) Tantulum Capacitor
1 x 0.1uF Capacitor.
1 x 0.01uF Capacitor.
1 x miniature 6 x 6mm tactile switche with a square button shoulder.
1 x Yellow round button for use with 6 x 6mm tactile switch
1 x Black 4mm Banana Socket
1 x Red 4mm Banana Socket
1 x Project Case, ABS, Aluminium Lid Material, 53mm Length, 83mm Width, 35mm Height, Matrix Board (from Rapid Electronics - Order Code: 30-0650) Cost £1.31.
1 x PP3 Battery Holder with Flying Leads (from Rapid Electronics - Order Code: 18-0163) cost £0.35.
Anyone interested can download the front panel template for this project (in PDF format) from the link below:
http://www.scullcom.com/Scullcom_5volt_Ref_front_panel.pdf
BELOW ARE PCB ARTWORK AND CONSTRUCTION IMAGES
http://www.scullcom.com/Scullcom_5v_Ref_PCB_and_layout.pdf
http://www.scullcom.com/Scullcom_5volt_Ref_onPCB_details.pdf

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