Halloween 2005: The Ghost Box

The Ghost Box

The ghost box is an old trunk with chains containing an entity that is trying to get out.


The left hand DIP socket is wired as follows, with connections to the right hand DIP socket (RHD):

Right hand DIP and terminal strip:

Right hand DIP:

Terminal strip:

The motor generated enough noise to activate one of the 555 timers. I added a 0.1uF capacitor close to the motor and twisted the power leads to the motor. This resolved the issue.

Relays and transistors that switch relays are protected using a diode, as shown below: