Electronic apparatus for biological research electronicappara00dona Year: 1958 RESISTANCES Clearly this modification makes no difference to the currents flowing in the various branches of the circuit; but it gives the arrangement an additional axis of symmetry which is sometimes useful. By applying the star-delta transformation to the T attenuator, we can write down the equations for the resistances in the pi form {Figure ). They are: ^M = ^2 + ^1 + ~^ ^iV = ^1 + ^1 + ji Substituting the expressions found for R^ and R^ in terms of d and r yields 1 + 0 Rm — f R^ = r 1 -02 16 A variant, re

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Electronic apparatus for biological research electronicappara00dona Year: 1958 RESISTANCES Clearly this modification makes no difference to the currents flowing in the various branches of the circuit; but it gives the arrangement an additional axis of symmetry which is sometimes useful. By applying the star-delta transformation to the T attenuator, we can write down the equations for the resistances in the pi form {Figure ). They are: ^M = ^2 + ^1 + ~^ ^iV = ^1 + ^1 + ji Substituting the expressions found for R^ and R^ in terms of d and r yields 1 + 0 Rm — f R^ = r 1 -02 16 A variant, related to the pi network in the same way as the H attenuator is to the T, is the box or O attenuator {Figure ). This is another balanced

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