. Electronic apparatus for biological research . V^^V^V, (a) Figure (b) In Figure , we have a difference diode and ballast resistance fed from a direct supply voltage which is greater than the running voltage but less than the striking voltage of the tube. Control pulses are introduced (via a capaci- tance) with respect to earth by a pulse generator of some kind, connected at A, as shown. Suppose the tube be at first extinguished. Then if a positive pulse be applied to the anode sufficient to carry it above the striking potential, the glow is initiated and the anode falls to the runnin
. Electronic apparatus for biological research . V^^V^V, (a) Figure (b) In Figure , we have a difference diode and ballast resistance fed from a direct supply voltage which is greater than the running voltage but less than the striking voltage of the tube. Control pulses are introduced (via a capaci- tance) with respect to earth by a pulse generator of some kind, connected at A, as shown. Suppose the tube be at first extinguished. Then if a positive pulse be applied to the anode sufficient to carry it above the striking potential, the glow is initiated and the anode falls to the running potential and the circuit remains in this 'aglow' condition indefinitely. However if now a negative pulse is fed in at ^4, the anode is carried below the running voltage and the glow is extinguished. On the cessation of the pulses the anode potential returns to + F and the circuit is once more stable in the 'not aglow' condition until a further positive pulse arrives at A. 124
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