. Electronic apparatus for biological research . Ry Current out of base, 0 ' vSltlge-. ^***'"y ^°'^^9e Secondary current V Figure the base positivity disappears and the transistor begins to conduct from emitter to collector again. The working point reverts to A and the cycle repeats {Figure ). The output voltage V^ depends on the step-up ratio «,. between L^ and L^,, and on the value of the load 7?^. Because the phases of magnetic field growth and collapse are quite separate in converters of this type, the growth phase is independent of the collapse phase; that is, the device d
. Electronic apparatus for biological research . Ry Current out of base, 0 ' vSltlge-. ^***'"y ^°'^^9e Secondary current V Figure the base positivity disappears and the transistor begins to conduct from emitter to collector again. The working point reverts to A and the cycle repeats {Figure ). The output voltage V^ depends on the step-up ratio «,. between L^ and L^,, and on the value of the load 7?^. Because the phases of magnetic field growth and collapse are quite separate in converters of this type, the growth phase is independent of the collapse phase; that is, the device draws a rather constant power from the battery, independent of the load resistance. The output voltage and current are therefore related by a rectangular hyperbola and the actual output voltage and current are determined in a particular case by the load used {Figure ). The power output of the device is adjustable in practical circuits by the resistor Ry. Notice that, except during the transition period—quickly over—between B and C in Figure , the P^ax hyperbola is never approached; that is, the collector dissipation is always low. This means that the efficiency is good, and that the device can handle powers much greater than the maximum 702 I
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