oscillator operable by a control signal and amplitude discriminator comprising a relaxation oscillator.

摘要

979, 802. Electronic counting apparatus; electric selective signalling systems. COMMISSARIAT A L'ENERGIE ATOMIQUE. June 13,1961 [June 13, 1960], No. 21339/61. Headings G4A and G4H. [Also in Divisions H3 and H4] An oscillator comprises a tunnel diode 11 (Fig. 4) in the emitter circuit of a transistor 10 with adjustable base bias and is keyed on by pulses c of variable duration applied to the base. Inductance or capacitance in parallel with the tunnel diode may adjust its oscillation frequency. The output oscillations may be counted, after limiting, as a measure of the input pulse duration c by applying them through capacitors C i ... c n to the collector circuits of a number of parallel connected normally blocked tunnel diode oscillators D 1 ... Dn so that each in turn is keyed on by successive pulses and due to resistors R 01 ... R 0n connecting the collector circuits, each in turn is prepared, by alteration of its collector operating voltage, for energization by a succeeding pulse. The last oscillator D n renders operative a normally blocked tunnel diode oscillator D 0 , T so that a pulse from its collector circuit to all the common electrodes of the oscillators D 1 ... D n again restores them to their initial blocked condition and the cycle recommences. The last oscillator operated is stored indication of the count, The system may measure the energy of atomic particles after conversion into pulses of variable amplitude applied through a rectifier 9 (Fig. 3) to charge a capacitor 8 for a duration determined by the discharge rate of the capacitor 8 through transistor 1 (as well as the amplitude of the input pulse), and terminating when a series connected second transistor 2, blocked by the pulse, is again rendered conductive, the resulting variable duration keying the oscillator N.