| 摘要 |
954,293. Valve pulse circuits. BELL PUNCH CO. Ltd. July 1, 1960 [July 16, 1959], No. 24481/59. Addition to 925,166. Heading H3P. The circuit described in the parent Specification for providing a different number of output pulses per cycle on each of a number of output terminals is improved by limiting the voltage swing at the output terminals. The circuit comprises a multi-cathode stepping tube D, the output terminals each being coupled to a different number of cathodes. As shown, valve V provides a train of phase-displaced pulses to drive electrodes DD1 and DD2 which cause the glow to be stepped successively along the cathodes of the stepping tube D. Output terminals 1-9 are connected via one or more diodes such as W1 respectively to one to nine cathodes of the stepping tube D. In each cycle of rotation of the glow therefore, one pulse appears on terminal 1, two pulses on terminal 2 &c. Diodes W21, W22 &c. are provided to reduce rise time by limiting the voltage to which the stray capacitance charges. Since terminals 1, 2 and 3 are connected only to one group of cathodes, diodes W1, W6, W11 may be omitted. Specification 925,161 also is referred to. |
