. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DIODE CIRCUITS Capacitor input rectifying circuit This is shown in the half-wave form in Figure It appears in apparatus of the type for power rectification (because no transformer can be used, so no centre-tap is available) and is the most usual form for signal rectification. A full-wave arrangement is shown in Figure and is almost B V s\r\ wt X I i _3 *Vsina/f o o o- o o o Figure â Vs\nujt Figure universal for supplying power to an electronic apparatus where
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. DIODE CIRCUITS Capacitor input rectifying circuit This is shown in the half-wave form in Figure It appears in apparatus of the type for power rectification (because no transformer can be used, so no centre-tap is available) and is the most usual form for signal rectification. A full-wave arrangement is shown in Figure and is almost B V s\r\ wt X I i _3 *Vsina/f o o o- o o o Figure â Vs\nujt Figure universal for supplying power to an electronic apparatus where the current is less than, say, 250 milliamps. Very few pieces of equipment consume more than this so that this circuit may be regarded practically as standard. To see how these circuits work, consider the half-wave case. Suppose R, the load, be temporarily disconnected and C discharged and the generator then switched on. When A swings positive the diode conducts, B is carried positive too and C is charged from the generator. When A and B reach the potential V, A begins to move negative again, reversing the potential difference across the diode, whose resistance therefore becomes high. The current cannot now flow into or out of the capacitance C, which remains charged to a potential V indefinitely. The important fact thus emerges that the no-load voltage of a capacitance-input rectifying circuit is equal to the peak generator voltage. Now let the load be reconnected and suppose the potential at A is just beginning to go negative (point a in Figure ). The potential difference Potential at B. Earth Potential a.\ A Figure across the diode reverses, switching it to high resistance, so that the charged capacitance is left connected only to the load, to which it delivers load current. The voltage across the capacitance falls in an approximately linear manner with time {b in Figure ) until point c is reached when A once more rises above B, switching the diode to low resi
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