. Electronic apparatus for biological research . Mains Figure Even greater independence of mains voltage fluctuations may be had by connecting stabilizer circuits in cascade, as for example in the arrangement in Figure , devised by Luke^ for supplying amplifiers. Electronically stabilized HT supplies In order to secure both independence of the mains voltage and a really low output impedance it is necessary to use electronic stabilization, employ- ing hard valves. Innumerable designs for doing this have been produced, 587

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