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A “Scale-of-two” High-Speed Counter Using Hard Vacuum Triodes

  • W. B. Lewis (a1)


A high-speed recording counter circuit is described which has proved very reliable. The basic circuit element employs two triodes in a symmetrical circuit which has two stable conditions. The circuit is triggered alternately from one stable state to the other by the applied impulses acting through a circuit comprising two “Westector” cuprous oxide rectifiers and an inductance.

It is easily possible to make a counter operate accurately at a speed of 20,000 random impulses a minute, provided that the associated recording meter operates in less than 1/100 sec.

A “watch-dog” thyratron recording circuit is also described. This is useful where the slow speed of the mechanical recording meter would introduce loss.



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* Wynn-Williams, , Proc. Roy. Soc. A, 136 (1932), 312.

Lewis, , Proc. Camb. Phil. Soc. 30 (1934), 543.

* For a recent bibliography see Starr, A. T., Wireless engineer, 12 (1935), 601.

* Lewis, Proc. Camb. Phil. Soc., loc. cit.

* Bateman, , Phil. Mag. 20 (1910), 704.

* Standard Telephones, type 4007J.

* Wynn-Williams, Brit. Pat. No. 421341.

Neher, and Harper, , Phys. Rev. 49 (1936), 940.


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