This is a portable bioamplifier, a small circuit that can be used to detect biological signals and convert them into an audible tone. Changes in skin resistance, data from a sensor, or signals picked up from plants can be converted into an audible sound for reproduction by a loudspeaker. Paranormal phenomena can be investigated by whatever electric signal they produce via an appropriate sensor.
Biofeedback is a technique by which persons are trained to make certain physiological changes in their bodies using signals from within. Physical therapists use.
Experiments with paranormal senses, such as in ESP, invoke the existence of what is called a third eye. This eye is analogous to the physical eyes that look out from the front of our heads, except that it provides the ability to "see the invisible" and to discern things that are displaced in time and space.
In this book we have described only a small part of all the experiments the reader can design using simple electronic circuits. Many of the projects described herein are experimental and simple and can be replaced by extended versions, including some commercial units. For instance, the magnetic field detector described in Project 40 can be replaced by a commercial amplifier with very high gain or used with the low-impedance preamplifier also described in this book.
This circuit can be used for meditation training or to control your paranormal abilities, and it is applicable to many paranormal experiments as suggested in the text. The hypnotic LED circuit is formed by a low-frequency oscillator with its frequency controlled by the resistance between two electrodes. The LEDs can be mounted on eyeglasses or as needed for a particular experiment.
The amount of light (e.g., controlled by the shadow of your hand) falling on the light-dependent resistor (LDR) in this project will determine the tone produced by the circuit. Extending your hand and keeping it over the LDR, you can control the tone produced by this circuit by letting more or less light fall on it. This is one of the applications for using this circuit as a feedback device.