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BLOOD_PRESSURE_INDICATOR

2014-11-04 10:13  
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BLOOD_PRESSURE_INDICATOR
Transducer bridge is energized at points A-A by external 3-kc oscillator. Unbalance voltage is amplified by V10 and demodulated by second bridge that operates as rectifier with phase discrimination, while energized at D-D by separate 3-kc oscillator source. During unbalance, the only components reaching ring demodulator are those in phase or l80° out of phase with reference carrier voltage, giving positive or negative swing on meter-R.Schild and N. Wesson, Servo Circuit Controls Artificial Heart, Electronics, 31:15, p 73-75.