Abstract: An analog switch circuit comprises a first transfer gate (20) and a second transfer gate (23). The first transfer gate comprise first P-type and N-type field-effect transistors (21) and (22) having first electrodes thereof commonly connected through an output terminal (5) to a load (6) and second electrodes thereof commonly connected through an input terminal (4) to an input signal source (7) of an impedance lower than that of the load. The second transfer gate comprises second P-type and N-type field-effect transistors (24) and (25) of a gate size smaller than that of the respective transistors constituting the first transfer gate having the first and second electrodes connected in parallel with the first and second electrodes of the first P-type and N-type transistors, respectively.

Abstract: An input unit adapted to input operation orders and set informations, necessary to automatic sales operations, into an automatic vending machine. The input unit is capable of easily coping with the changes in and the addition to the input contents, of easily and positively inputting the selling prices as the set information, of remarkably reducing the signal harness for input use into an automatic vending machine.

Abstract: A microcomputer comprises an address decoder (23) for providing address signals to a random access memory (21). The address decoder (23) is adapted to generate a plurality of address signals in accordance with one piece of instruction data obtained from an instruction register (10). On the other hand, a control circuit (11) is provided for generating change signals in response to the instruction data for controlling a T type flip-flop (24, 25 or 26). The address decoder is responsive to the signal from the T type flip-flop to select and provide one of the plurality of address signals. Accordingly, a plurality of addresses are designated in accordance with one piece of the instruction data, whereby one of them is selected by a change signal. Thus, a program for addressing a random access memory can be simplified.

Abstract: An easily restarted brushless DC motor has a skeleton type stator core, a rotor core having permanent magnets arranged around it, and needs only one position sensor adapted to detect a rotational position of a rotor and only one stator coil. A controller is provided for switching over the polarity of the electrical power supplied to the stator coil in accordance with an output of the position sensor.

Abstract: At least two microcomputers are provided for the controlling operation of an automatic vending machine, which are connected by signal wires of a number selected from one to four with respect to each other. One of the microcomputers is a main microcomputer, while the other thereof is a submicrocomputer. The submicrocomputer performs the controlling operation on the restricted block functions of the automatic vending machine, while the main microcomputer transmits control codes to the submicrocomputer through the signal wire to control the operation thereof, and controls the automatic vending operation while serially transmitting or receiving the necessary data.

Abstract: A variable reactance circuit which can produce equivalent reactance varying from negative given values to positive given values in accordance with fundamental reactance elements such as capacitor, coil, etc. The present invention has a big advantage of being capable of easily producing the positive, negative equivalent reactance given times as much as the basic reactance element with the use of a circuit which can be integrated.

Abstract: A hermetically sealed motor compressor for use in a small-size refrigerating machine, refrigerator, freezer and the like has a compressor on which is mounted a silencer comprising in combination a suction muffler of thermal insulating and a discharge muffler made of formed metal plates. The suction muffler has an suction port disposed near the open end of a suction coupling fixed to a sealed casing, and also has an connection pipe connected to a compressor cylinder and having a distal end fitted directly in a hole defined in an head plate which is mounted on the head of the cylinder. A refrigerant gas as it is introduced from the suction coupling into the sealed casing can be drawn into the cylinder through the suction port, the suction muffler and the connection pipe to minimize heat transfer to the suction gas, so that the compressor can increase its volumetric efficiency.

Abstract: An induction heating coil and a self-excited inverter are connected to a ripple voltage source. The self-excited inverter comprises a transistor as a switching element and the transistor is rendered conductive responsive to a drive voltage applied for each cycle of the ripple voltage source, whereby the self-excited inverter is started at each cycle of the ripple voltage source. The self-excited inverter stops the oscillation when the voltage of the ripple voltage source becomes lower than a predetermined value. During the non-oscillation period of the intermittent oscillation, the oscillation output of the self-excited inverter is detected. If and when the oscillation output is detected at that time, the oscillation of the inverter is stopped. Furthermore, the pulses of the attenuating oscillation of the self-excited inverter during the oscillation rest period are counted.

Abstract: An induction heating coil and a self-excited inverter are connected to a ripple voltage source. The self-excited inverter comprises a transistor as a switching element and the transistor is rendered conductive responsive to a drive voltage applied for each cycle of the ripple voltage source, whereby the self-excited inverter is started at each cycle of the ripple voltage source. The self-excited inverter stops the oscillation when the voltage of the ripple voltage source becomes lower than a predetermined value. During the non-oscillation period of the intermittent oscillation, the oscillation output of the self-excited inverter is detected. If and when the oscillation output is detected at that time, the oscillation of the inverter is stopped. Furthermore, the pulses of the attenuating oscillation of the self-excited inverter during the oscillation rest period are counted.

Abstract: An off-line switching regulated power supply employing a switching transistor, wherein the base drive system is improved to supply a reverse base current, remaining an interval after the termination of a forward base current, thereby the influence of the storage time of the switching transistor is removed and various drawbacks including the problem due to the incompatible characteristics of a breakdown voltage and switching speed, the problem due to delay in turning-off and the problem of overheating, are removed, resultantly enabling to provide a switching power supply which is allowed to employ a higher switching frequency.

Abstract: An absorption heat pump system having a generator, a condenser, an evaporator and an absorber connected hermetically to form closed cycles for a refrigerant and an absorbent, comprising a control means disposed in the refrigerant passage leading from said condenser to said evaporator and adapted to continuously controlling the temperature or flow rate of the liquid refrigerant, thereby to stabilize the temperature in said evaporator.

Abstract: A noise detecting circuit in a television receiver, which comprises a horizontal synchronizing signal separating circuit (17) for separating a horizontal synchronizing signal from a detected composite video signal, a differential circuit (101) for extracting a noise component included in the horizontal synchronizing signal period of the composite video signal as a function of the separated horizontal synchronizing signal, and a rectifying circuit (102) for rectifying the extracted noise component for providing a direct current voltage associated with the magnitude of the noise component in the composite video signal. The noise detected output is applied to an automatic frequency control circuit (26) for the purpose of controlling the sensitivity of an automatic frequency control operation thereof. The noise detected output is also applied to the automatic frequency control circuit (26) for the purpose of controlling the impedance of a filter thereof.

Abstract: A control device for brushless motor comprises an inverter (3), a control circuit (8) and a rotor position detecting circuit (9). In the rotor position detecting circuit (9), voltage induced in stator coils (U, V and W) due to rotation of a rotor (7) and neutral voltage at a virtual neutral point (25) are compared by comparators (CU, CV and CW) so that polarity changing points can be detected. The control circuit (8) controls the inverter (3) based on the above stated polarity changing points so as to control changeover of the modes for conducting to the stator coils (U, V and W). As a result, rotation of a brushless motor can be controlled without using Hall elements.

Abstract: A noise removing apparatus in an FM receiver includes a high-pass filter (29) receiving an output from an FM detector circuit (11), a gate (15) being interrupted in response to a pulsive noise detected by level-discriminating an output from a variable gain amplifier (35) receiving an output from the high-pass filter (29). Transistors are provided for controlling the gain of the variable gain amplifier (35) according to the magnitude of a terminal voltage of a capacitor which is charged according to an output from a rectifying circuit (43). The noise removing apparatus further includes a voltage generator (51) for generating a voltage proportional to a received electric field strength and a circuit (53) for varying an amount to be charged in the capacitor according to the magnitude of a voltage from the voltage generator (51) for maintaining the gain of the variable gain amplifier (35) large at the time of strong electric field, so that a multipath noise can be effectively removed.

Abstract: A tuning control apparatus of a receiver having an electronic tuner comprises a tuning voltage generating circuit including a window comparator, a charge pump and a low-pass filter. An S curve signal is applied to the window comparator to make a search controlled by means of a voltage synthesizer system using the S curve signal until the receipt of a broadcasting signal. If an optimum tuning point is established through the search control, the local oscillation frequency at that time is counted to provide frequency division ratio data. A phase-locked loop is operated as a function of the frequency division ratio data on the occasion of the above described optimum tuning point, whereby reception of the broadcasting signal is continued. Preferably, an automatic frequency control operation is performed before the phase-locked loop is operated.

Abstract: An absorption refrigeration system having a generator, a rectifier, a condenser, an evaporator, an absorber and heat exchangers which are connected by means of conduits in an airtight manner so that circulations for refrigerant and for absorbent solution are formed, wherein the rectifier is mounted upright above the generator, and wherein a receiver for receiving absorbent containing refrigerant is mounted below the rectifier and communicates with the lower portion of the generator through an absorbent passage means, whereby decreasing hindrance of the generation of the refrigerant vapor from the generator, thus increasing the efficiency in generating vapor and, at the same time, preventing local overheating of the solution in the generator.

Abstract: A ladder-type signal attenuator comprises a ladder network (50) storing a ladder resistor circuit of a plurality of stages (n-1) each having an input resistor (2R) and an output resistor (R) and a ladder portion of the final stage (n) having an input resistor (8) and an output resistor (7) and coupled to the ladder resistor circuit. The resistance value (RB) of the input resistor (8) of the ladder portion of the final stage is different from 2R and/or the resistance value (RA) of the output resistor (7) is different from R. A bias voltage (Vb) or an analog input signal (Sin) is selectively applied to a corresponding signal input terminal of the ladder circuit (50) by means of switches (S.sub.1 to S.sub.n) in response to control data (b.sub.1 to b.sub.n) of n bits. At least one of the resistance values of the two resistors (7, 8) of the final stage ladder portion is changed as a function of the state "0" or "1" of the final bit (b.sub.

Abstract: A Schmitt circuit comprises a series connection of a first, second and third MOS transistors connected between a voltage source and the ground, and a fourth MOS transistor connected between the voltage source and the junction of the second and third MOS transistors. An input voltage is applied to the gates of the second and third MOS transistors. The voltage at the junction of the first and second MOS transistors is applied to the gate of the fourth MOS transistor and is also led out as an output. The Schmitt circuit further comprises a series connection of a sixth and seventh MOS transistors connected between the voltage source and the ground for dividing the source voltage, and a fifth MOS transistor connected between the junction of the sixth and seventh MOS transistors and the junction of the first and second MOS transistors and adapted to be rendered conductive when the potential at the said junction exceeds a predetermined voltage.

Abstract: Oil burner, having an ignition mechanism and a wick movable upwardly and downwardly, and being operated with ease by completing wick lifting and ignition simultaneously in a single operation.

Abstract: An induction heating coil and a self-excited inverter are connected to a ripple voltage source. The self-excited inverter comprises a transistor as a switching element and the transistor is rendered conductive responsive to a drive voltage applied for each cycle of the ripple voltage source, whereby the self-excited inverter is started at each cycle of the ripple voltage source. The self-excited inverter stops the oscillation when the voltage of the ripple voltage source becomes lower than a predetermined value. During the non-oscillation period of the intermittent oscillation, the oscillation output of the self-excited inverter is detected. If and when the oscillation output is detected at that time, the oscillation of the inverter is stopped. Furthermore, the pulses of the attenuating oscillation of the self-excited inverter during the oscillation rest period are counted.