12a : Build a switch operated HO
scale Target Signal using 1 bicolor LED
This project involves the construction of a simple target searchlight type signal system operated manually by a double pole switch and 9 volt power supply. This signal system is made using a single, two lead, bicolor LED Red and Green.
12b : Use a modified Bachmann(TM) HO Block Signal with 2 LEDs added
This project involves adding a Green and Red LED to a Bachmann HO Block signal and operating it using the same 9 Volt power supply and switch.
Both signals can be operated automatically using a microcontroller along with a train occupancy detection system. (a future project)