Part    Manufacture and p/n                     Digikey             Mouser
----    -------------------                     -------             ------
BT1     Memory Protection Devices p/n: BS-5     BS-5-ND             N/A
D1      Betlux Electronics p/n: BL-L101UYW-B-S3 N/A                 N/A
R1      Resistor through hole, 47 or 56 ohms    CF14JT47R0CT-ND     279-CFR25J56R 56 ohms
SW1     C&K Components p/n: OS102011MS2QS1      CKN9542-ND          611-OS102011MS2QS1