This is the easy and Simple Ghost Detector Circuit Diagram. This is a changing charge detector. If a ghost disturbs the electric field in the vicinity of this gadget you will see the results on the LEDs. Don't hold your breath, unless you wish to become a ghost yourself. There's a pair 'a normal LEDs that display whether the charge at the antenna is changing in a positive or negative direction (green vs red). Simple Ghost Detector Circuit Diagram Here's how it works: The electrometer JFET buffers the voltage on the telescoping antenna. Its gate is gently biased low by a neon lamp that contains a little thorium that makes it slightly conductive (most, if not all, neons have thorium inside to help them start). The 22 pF is optional and reduces the 60 Hz "hum" level a bit. Much bigger and the response to sudden changes starts to be impaired. The 1 megohm in the gate is there to protect the JFET from static discharge when the antenna is touched to something. The F...