Abstract: A transformer coupled switching regulator power supply having current-limiting circuits and under-voltage detecting circuits on the primary side of the power transformer. The under-voltage detection circuit acts to substantially terminate the flow of current through the switching circuits in the case of a short circuit in the load.

Abstract: A frequency synthesizer for use in a transmitter/receiver, comprising a voltage controlled oscillator, a programmable frequency divider for dividing the frequency of the output from the voltage controlled oscillator, a reference oscillator, a reference counter for dividing the frequency of the output from the reference oscillator, a phase detector for phase detecting the frequencies of the reference counter and the frequency divider for providing a control voltage to said voltage controlled oscillator, a transmitting/receiving mode selection circuit for selectively controlling the programmable frequency divider such that the frequency division rate thereof is different in the transmitting and receiving modes, a channel designating circuit, a first output terminal for withdrawing an output by mixing the output from the voltage controlled oscillator with the output from the reference oscillator, and a second output terminal for directly withdrawing the output from the voltage controlled oscillator, said transmi

Abstract: A frequency synthesizer for use in a transmitter/receiver, comprising a voltage controlled oscillator, a programmable frequency divider for dividing the frequency of the output from the voltage controlled oscillator, a reference oscillator, a reference counter for dividing the frequency of the output from the reference oscillator, a phase detector for phase detecting the frequencies of the reference counter and the frequency divider for providing a control voltage to said voltage controlled oscillator, a transmitting/receiving mode selection circuit for selectively controlling the programmable frequency divider such that the frequency division rate thereof is different in the transmitting and receiving modes, a channel designating circuit, a first output terminal for withdrawing an output by mixing the output from the voltage controlled oscillator with the output from the reference oscillator, and a second output terminal for directly withdrawing the output from the voltage controlled oscillator, said transmi

Abstract: A diaphragm for a dynamic cone speaker which is composed of a porous metal produced from a metal such as nickel, wherein a layer, such as of aluminum foil, is disposed on a surface of the porous metal to eliminate the gas permeability of the porous metal.

Abstract: An apparatus for removing a pulsive noise in an FM stereo signal including a stereo information signal and a stereo pilot signal, said composite signal further including a pulsive noise, said apparatus comprising an FM detector for providing said composite signal, a noise detector for detecting said pulsive noise for providing a control signal of a predetermined pulse width upon occurrence of said noise, a gate circuit to be normally closed for passing therethrough said composite signal and to be opened by the output from the noise detector, an amplifier for amplifying the output from the gate, a frequency band cut off filter coupled to said amplifier to form a negative feedback circuit, said filter being set to the pilot signal frequency and/or the subcarrier signal frequency, an attenuator coupled to the output of said amplifier, and a capacitor coupled to the output of said gate circuit and cooperative with said attenuator for holding, when the gate is opened, the signal level at the output of the gate to

Abstract: A system and method for determining vendibility in an automatic vending machine, comprising: a coin sorter, coin detectors for sorted coins, coin reservoirs for sorted coins, empty switches provided to the respective coin reservoirs, said coins comprising three kinds of coins, 100 yen, 50 yen and 10 yen coins, a change pay off mechanism for paying off change using said reserved coins in said reservoirs, commodity price setting means, a counter for counting the number of received 50 yen coins, a counter for counting the number of received 10 yen coins, a signal generator for generating information of the total amount of received coins based on coin detecting signals, a signal generator for generating unit information associated with 10 yen, and a subtractor for sequentially subtracting said unit information from said total amount information, wherein availability of received coins as change is determined at each stage of said sequential subtraction, whereby vendibility for the respective amount at each stage o

Abstract: A radio-controlled vehicle having a steering motor, a drive motor, a drive mechanism, and a direction sensor for receiving an RF signal from a remote station to actuate the drive motor and to control the steering motor to direct the vehicle to the station. Also, an ultra-sonic anti-collision circuit for preventing the vehicle from colliding with any obstacle lying in the way of its travel. The direction sensor includes an integrating circuit to remove noise components from the direction control signal to thereby provide precise control to the drive mechanism. The ultra-sonic anti-collision circuit includes circuits for preventing malfunction of the anti-collision circuit due to mechanical shocks and/or vibrations of the vehicle.

Abstract: An improved high speed switching circuit having at least an emitter grounded switching transistor, a first resistor connected between the base of said transistor and an input terminal, a second resistor connected between said base and the ground, a plurality of series connected diodes connected between the input terminal and the collector of said transistor has been disclosed. The ratio of the resistance of the first resistor to that of the second resistor is determined in accordance with the number of said series connected diodes.

Abstract: A pulse generator which can be applied to a horizontal deflection circuit and/or a vertical deflection circuit of a television set and of which almost all parts can be easily manufactured in a single IC (Integrated Circuit) chip has been found. A capacitor in an integrator circuit is charged and discharged alternately. The voltage across said capacitor and a second voltage, which is controlled by said voltage across said capacitor, are compared with a predetermined voltage. According to the result of the comparison, the capacitor is charged or discharged and, thus, a pulse oscillation is provided.

Abstract: An improved D. C. power source whose output voltage is independent of changes in temperature is disclosed. Compensation for changes in temperature is established by three features. For a change of the voltage drop in the forward direction between the base and the emitter of a transistor, a plurality of diodes provided in a bias circuit in the transistor are utilizied; for a change of the current amplification factor .beta. of a transistor, an additional transistor is attached to the transistor, and; for a change of the value of an emitter resistor connected between the emitter of the transistor and the ground, an external stable resistor is utilized. The D. C. power source of the present invention is, in particular, useful for an integrated circuit.