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Alpha Rhythm And Biofeedback (PN026E)

The mysteries of the human mind and even paranormal phenomena can be studied with the help of many types of electronic equipment. In fact, even relaxation and meditation can be studied with the use of simple electronic equipment. The association of brain rhythms, such as alpha, to several phenomena studied with the help of simple electronic circuits can generate very interesting works. In this article, we will talk about the alpha rhythm and some devices which allow its study in a simple way.

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Touch Switch (ART491E)

With the circuit of figure 1 we obtain a high logic level in the output when we touch with the fingers in sensor X1. The circuit can be powered with voltages from 3 to 15 V and its output can either excite CMOS logic or interfacing circuit with power relays, solenoids and even data acquisition interfaces.

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Sound Shields (MIC028E)

Microcontrollers, as the name says, are devices for controlling devices from external signals such as sensors. Microcontrollers are not made to produce sounds. However, there are times when we need a circuit which contains a microcontroller to produce sounds. In this article, we'll give you some interesting suggestions on how to do this.

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Low noise audio source (ART489E)

The circuit presented is suggested by Maxim (www.maxim-ic.com) consisting of a very low-noise, low-ripple power supply for amplifiers, microphones, headphone amplifiers, CODECs and especially circuit-sensitive audio circuits (2008). The circuit of figure 1 reduces the noise voltage and the ripple by 40 dB for frequencies between 100 Hz and 20 kHz, which corresponds exactly to the audio range.

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Circuit Bench

MultiSIM Blue