555 frequency and duty ratio adjustable electronic therapeutic equipment circuit

Published:2011/5/24 1:29:00 Author:TaoXi | Keyword: frequency, duty ratio, adjustable, electronic therapeutic | From:SeekIC

As the figure 16-22 shows, the electronic therapeutic equipment is composed of the pulse generator, the voltage comparator, the amplifier stage and the power supply. The step-down rectifier circuit can produce the voltage of VDD=+8V and E2=+40V as the electronic therapeutic equipment's power supply. The astable multivibrator is composed of the IC1, R5，RP3，C2 and the constant-current tube D3, the oscillation frequency f=1.44/(R5+RP3)C2, you can change the frequency by adjusting RP3. D3 uses the 2DH type constant-current tube to guarantee the linearity of C2's charging sawtooth voltage. IC2 uses the LA2400 voltage comparator. VT1 and VT2 uses the VMOS type power amplifier tube. The voltage is output by the two channels of Jacks CK1 and CK2.



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