. Electronic apparatus for biological research . H iP Mams Figure The steady current drain on the negative supply produces a sufficient drop across the 5k resistor to ignite the voltage reference tube, applying reference potential to the left-hand side of the differential amplifier, between ? 300 100 mA max o 12 El Stabilized ?ve supply out -O+550 T EL8A f Stabilized -ve supply out OlaF 330k< -300 50 mA max 7S 100 k 1/212 AT7

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