Abstract: A portable device (8) for recognizing Acute Myocardial Infarction by the patient himself without the help of medical doctors or technicians is described. The invention performs a real-time analysis of the ST segment (9) in an ambulatory electrocardiographic measurement environment to help the patient decide by himself that he is suffering an Acute Myocardial Infarct. The device (8) is capable of warning the user that he/she may be suffering a heart attack when the ST segment (9) is found to be depressed or elevated. The CARDIOST features a simple-to-use portable electrocardiographic amplifier (15) and a microcontroller unit (17) to analyze the ST segment (9) on the signal received from the electrocardiographic amplifier (15).

Abstract: An AC voltage regulator to be used to regulate voltage fluctuations both above and below a desired voltage output, the regulator including a regulator input connected with an AC power source, a regulator output connected with a load, and a single regulator transformer having a power winding and an inducing winding. The power winding is connected in series between the regulator input and the regulator output and the inducing winding, which is generally electrically isolated from the power winding, is structured and disposed to selectively induce a low voltage on the power winding. Further, a plurality of high frequency AC switches are included so as to variably set a plurality of connection topologies, each connection topology being specifically structured either to maintain voltage passing through the regulator constant, to step-up the voltage or to step-down the voltage, the various switches being variably positionable to provide for precise, gradual regulated adjustment of the output voltage.