Pulse producing circuit particularly adapted for button type telephones

Claim 1

A device for the transmission of a series of electronic pulses, comprising: a. a plurality of N interconnected stages; b. means for applying an input signal from an external source to any individual stage without activating preceding stages; c. means in each stage for providing an output pulse to an output circuit, and for providing a triggering pulse for the next subsequent stage, whereby the number of pulses applied to the output circuit depends upon how many stages ahead of the Nth stage the signal is applied; d. each stage comprising a single silicon controlled rectifier having an anode, a cathode and a gate, said anode connected to a bias potential, said cathode connected to a ground, and said gate connected to said input signal whereby the silicon controlled rectifier is adapted to be gated either by a pulse from a previous stage or by an external input signal, said cathode also providing said triggering pulse across a timing capacitor and through a trigger to the next stage; e. said triggering pulse gating on the silicon controlled rectifier of the next stage; f. said triggering pulse generated by a stage turns off the silicon controlled rectifier of that stage; g. said capacitor having one terminal connected to the trigger device, and through a resistor to the cathode of said silicon controlled rectifier, said one terminal having only these connections, and the other terminal connected to ground.

Claim 2

A device for the transmission of a series of electronic pulses, comprising: a. a plurality of N interconnected stages; b. means for applying an input signal from an external source to any individual stage without activating preceding stages; c. means in each stage for providing an output pulse to an output circuit, and for providing a triggering pulse for the next subsequent stage, whereby the number of pulses applied to the output circuit depends upon how many stages ahead of the Nth stage the signal is applied; d. each stage comprising a single silicon controlled rectifier having an anode, a cathode and a gate, said anode connected to a bias potential, said cathode connected to a ground, and said gate connected to said input signal whereby the silicon controlled rectifier is adapted to be gated either by a pulse from a previous stage or by an external input signal, said cathode also providing said triggering pulse across a timing capacitor and through a trigger to the next stage; e. said triggering pulse gating on the silicon controlled rectifier of the next stage; f. said triggering pulse generated by a stage turns off the silicon controlled rectifier of that stage; g. said capacitor having one terminal connected to the trigger device, and through a resistor to the cathode of said silicon controlled rectifier, said one terminal having only these connections, and the other terminal connected to ground.