Electronic apparatus for biological research electronicappara00dona Year: 1958 ? a> Figure Figure At CO large, then, the circuit simplifies to R^ and Q, a simple low-pass filter, and Kout will fall with increasing frequency. By a similar process, we can deduce that when m is low, the important elements are C^ and R^, forming a simple high-pass filter, with Fout falhng as the frequency is reduced. If the output is falling at both ends of the frequency spectrum, it presumably has a maximum at intermediate frequencies and the transmission charac- teristic has probably some such sha
Electronic apparatus for biological research electronicappara00dona Year: 1958 ? a> Figure Figure At CO large, then, the circuit simplifies to R^ and Q, a simple low-pass filter, and Kout will fall with increasing frequency. By a similar process, we can deduce that when m is low, the important elements are C^ and R^, forming a simple high-pass filter, with Fout falhng as the frequency is reduced. If the output is falling at both ends of the frequency spectrum, it presumably has a maximum at intermediate frequencies and the transmission charac- teristic has probably some such shape as Figure This, in fact, proves to be the case. Re-drawing the network in terms of -'^i K>ut Figure reactances instead of capacitances gives Figure To prevent the investiga- tion taking too long we shall set X-^— X^ — X, and see what happens as we vary R^ and R^. By inspection we can write down which simplifies to -jR^X out Fin Rr-JX- R,-jX out -jR,X Fin (i?ii?2 - ^') - m2R2 + Ri) 47
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