. Electronic apparatus for biological research . Figure voltage appears across the primary v/inding L^, and the current in it rises linearly at a rate £/L^ amps per second. If the turns ratio between Lj, and Lj, is «6 : 1 then the voltage induced across L^ by the current rising in Lj, is En^ and the sense of connections is such that this drives a current 4 = {Erif^jRy out of the base of the transistor. The working point therefore moves towards B in Figure , along the characteristic corresponding to a base current of this value. c ft 3 U U o U Magnetic field grows

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