555 alpha/theta meditation device circuit

Published:2011/5/25 4:03:00 Author:TaoXi | Keyword: 555, alpha, theta, meditation device | From:SeekIC

The design principle of the alpha/theta meditation device depends on human have different brain waves in different conditions, it can produce the flashing light which has the same frequency with the alpha/theta wave to make the brain wave in the resonance oscillation state, so people feel good, the circuit is as shown in figure 16-9. The table 16-1 shows the brain wave frequencies of different conditions. When you feel good, the brain wave frequency is the alpha wave. The astable multivibrator is composed of the 555 and R2，R3，RP1，C2, f=1.44/(RP1+R2+2R3)C2, the oscillation frequency is between 2～20Hz. The output of 555 gets through the VT1, and makes the VT1 issues the 7-14Hz flashing light.



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