. Electronic apparatus for biological research . 3_ lOOk^ipOOpF I 1,000 pF 41 -3-7 EF86 +60V 2-7k 3^Output I 6uF 12 V To -^ heaters-^ -v^ -o + Figure To 6V car battery low resistance electrodes, and is very suitable for beginners' use. Because it is single-sided, it is unable to discriminate against interfering fields, and consequently the preparation and electrodes must be totally screened. Unless a screened room is available this rather restricts its application to small animals. As an added measure of protection against 50 cycles pick-up the coupling time constants are chosen so t
. Electronic apparatus for biological research . 3_ lOOk^ipOOpF I 1,000 pF 41 -3-7 EF86 +60V 2-7k 3^Output I 6uF 12 V To -^ heaters-^ -v^ -o + Figure To 6V car battery low resistance electrodes, and is very suitable for beginners' use. Because it is single-sided, it is unable to discriminate against interfering fields, and consequently the preparation and electrodes must be totally screened. Unless a screened room is available this rather restricts its application to small animals. As an added measure of protection against 50 cycles pick-up the coupling time constants are chosen so that this frequency lies well below the bottom end of the amplifier pass-band. The first stage is triode connected to eliminate partition noise, and the signal is fed to it via a CR network; this keeps the valve's grid current out of the preparation. The gain lies between 1,500 and 2,000 times; it will depend upon the particular valve specimens in use. The upper limit of frequency response is largely deter- mined by the output cable; it is profitless to have the pass-band excessively 618
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber666
