. Electronic apparatus for biological research . Figure conditions are obtained when the of the coupHng battery is 78 V. The coupling battery does not have to supply any current and so can com- prise small cells of the deaf-aid type. It is a bad thing to use a physically large coupling battery as the high frequency performance of the amplifier will be spoiled by the capacitance of the battery to earth. Deaf-aid batteries do not possess taps, so the design of battery-coupled stages is restricted by the available battery voltages. As the smallest and most convenient batteries can be m
. Electronic apparatus for biological research . Figure conditions are obtained when the of the coupHng battery is 78 V. The coupling battery does not have to supply any current and so can com- prise small cells of the deaf-aid type. It is a bad thing to use a physically large coupling battery as the high frequency performance of the amplifier will be spoiled by the capacitance of the battery to earth. Deaf-aid batteries do not possess taps, so the design of battery-coupled stages is restricted by the available battery voltages. As the smallest and most convenient batteries can be made up from units giving multiples of 15 V, the mean anode voltage finally chosen in a design may have to be altered ±7| V from the provisional value. This is not usually a very serious matter. A disadvantage with coup- Hng batteries is that before they are many months old their voltage becomes rather erratic, so that spurious signals are generated in the amplifier and the batteries have to be replaced. With a large number of stages this is a tedious and expensive business. 150
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