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555 simple electrocardiogram validator circuit

2017-01-18 09:06  
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555 simple electrocardiogram validator circuit
The figure 16-15 shows the validator that can be used to check the sensitivity, the damping, the linearity, the difference distinguishing ratio, the paper passing speed and the guide line connection of the electrocardiogram validator. The astable multivibrator is composed of the IC(555) ad RP1, R1, RP2, C1, the T=0.693(RP1+RP2+R1)C1. By adjusting RP1, the oscillation period T=0.6 second, and you can change the duty ratio by adjusting RP2, then the pulse width will be 0.2 second. You can get the 4mV square wave signal from CK3. This square wave signal is separated by R4~R7, so each resistance has the square wave signal of 1 mV. You can get out the 1.5V square wave signal from the LED as the difference ratio measurement signal to set the electrocardiogram device.