Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 DIODE CIRCUITS and B are at the same potential. Since B is earthed, A must be at earth potential too. The action of the reference wave on the diodes is alternately to make high and low the resistance of the path from A to earth. Now let Signal in 'LTLT Earth' 1 Rectified ^3\^ 1 n r out Earth nnnnnnnnnn 'LTL Reference wave in Figure the signal square wave be applied to the left-hand plate of the coupling capacitor. If the capacitor is large, the same voltage wav
Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 DIODE CIRCUITS and B are at the same potential. Since B is earthed, A must be at earth potential too. The action of the reference wave on the diodes is alternately to make high and low the resistance of the path from A to earth. Now let Signal in 'LTLT Earth' 1 Rectified ^3\^ 1 n r out Earth nnnnnnnnnn 'LTL Reference wave in Figure the signal square wave be applied to the left-hand plate of the coupling capacitor. If the capacitor is large, the same voltage waveform must be present on the right-hand plate too, but as either the negative or positive sectors are earthed by the diodesâdepending on the phase of the inputâ Reference -f wave â^ fqâpe^rth -f F Signal _r -Earth Output ~r -Earth n. -Earth Figure the output wave, as it were, 'stands' or 'hangs' from earth potential {Figure ). By passing the output through a low-pass filter the average value may be extracted, and this is the output required. AV Sig. in 1 VJ mMMM) nroo'o'o'oo'(ro ORcf. wave in ] Output â A/VNAAAAaT I (b) (a) Figure This simple circuit has two snags: (1) if the diodes are not perfectly similar the output is complicated by a component of the reference wave; (2) the path to earth is not of very low resistance, since it involves the current limiting resistors. The former objection can be overcome by replacing the 116
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