| 摘要 |
<p>1,086,621. Electro-physical measurement. TELEFUNKEN PATENTVERWERTUNGS G. m. b. H. Feb. 12, 1965 [Feb. 13, 1964], No.6190/65. Heading G1N. [Also in Divisions H3 and H4] A resonant circuit comprises an inductor 2 and a capacitance formed by the base-emitter and base-collector junctions of a non-conducting transistor 3. The resonant circuit forms part of a three point oscillatory circuit having transistor 1 as its active element, the oscillation frequency being varied by variation of the base potential of transistor 3. The oscillator may be used for making pH measurements in the stomach, by means of electrodes attached to terminals 7.</p> |
