555 simulation breathing technique information instrument circuit

Published:2011/5/24 2:35:00 Author:TaoXi | Keyword: simulation, breathing technique, information instrument | From:SeekIC

As the figure 16-25 shows, the information instrument is composed of the step-down rectifying power supply (VDD=+12V), the timing circuit, the multivibrator, the amplifier function output head. The start timing circuit is composed of the IC1 and R1，RP1，C3, the timing time td=1.1(R1+RP1)C3. In the timing time, J closes to control the connection of J1-1，J1-2's contact points. The controllable multivibrator is composed of the IC2 and R5, R6, RP2, C8, f=1.44/(R5+2R6+RP2)C8, you can change the frequency with the control voltage of pin-5 (RP3). VT1 uses the VMOS FET power transistor. The function output head uses the 0.85um gallium arsenide semiconductor laser, the PTC special infrared radiation ceramic material and the strong magnetic field SmCo magnet.



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