. Electronic apparatus for biological research . Figure The GC 10 B is, for obvious reasons, called a 'double pulse' dekatron, and driving it is seen to be a matter of providing two negative pulses in quick succession. This may be done in a number of ways; in most of them a negative pulse is applied directly to the first guides and via a low-pass filter to the second, as in Figure With properly chosen values the waveforms are then as sketched in Figure Input and first guides Second guides Figure The output pulse from one dekatron is in the wrong phase and of insuffici
. Electronic apparatus for biological research . Figure The GC 10 B is, for obvious reasons, called a 'double pulse' dekatron, and driving it is seen to be a matter of providing two negative pulses in quick succession. This may be done in a number of ways; in most of them a negative pulse is applied directly to the first guides and via a low-pass filter to the second, as in Figure With properly chosen values the waveforms are then as sketched in Figure Input and first guides Second guides Figure The output pulse from one dekatron is in the wrong phase and of insufficient magnitude to drive another. A circuit recommended by the manufacturers which eff'ects the necessary phase reversal, amplification and double pulse production is shown in Figure It makes use of the high-speed trigger-tetrode type GTE 175M, which is convenient in that no cathode heater power is required. 7 his circuit works up to 500 counts/sec. The GC 10 D—This high-speed dekatron has 40 electrodes equally spaced around the anode, made up of 10 cathodes and 3 sets of guides. All first guides are brought out together as one connection, and all second guides as another. The third guides are divided, as are the cathodes, into output third guide and all other third guides, and output cathode and all other cathodes: the output third guide, of course, precedes the output cathode. The gas filling appears to be argoa The circuit diagram is as in 651
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