Abstract:
A frequency generator which can perform stable frequency oscillation unaffected by temperature variation. A frequency generator having a differential amplifier (1) having an LC resonance circuit (10) as a load and buffer circuits (21, 22) feeding back an output of the differential amplifier to its input, wherein a temperature coefficient converter (5) converting an output voltage of a reference voltage generator (4) and its temperature dependence to a voltage having a predetermined voltage and temperature coefficient and outputting it is provided to control bias currents IEF of emitter follower circuits to be in proportion to temperature variation. There are a characteristic in which delay time of the emitter follower circuits constructing the buffer circuits is in inverse proportion to a transconductance of transistors and a characteristic in which the transconductance is in inverse proportion to temperature and is in proportion to the bias currents IEF. An oscillation frequency stable to temperature variation can be obtained.
Abstract:
The invention provides a partially protected trisphenol having the general formula (I) wherein R1 is an alkyl group of 1-4 carbons or an alkoxyl group of 1-4 carbons, R2 is an alkyl group of 1-6 carbons or a cycloalkyl group of 5 or 6 carbons, X1 is a hydrogen atom, an alkoxycarbonylmethyl group wherein the alkyl group has 1-4 carbons, an alkoxycarbonyl group wherein the alkyl group has 1-4 carbons or a tetrahydropyranyl group, X2 is a hydrogen atom, an alkoxycarbonylmethyl group wherein the alkyl group has 1-4 carbons, an alkoxycarbonyl group wherein the alkyl group has 1-4 carbons or a tetrahydropyranyl group, provided that when X1 is a hydrogen atom, X2 is not a hydrogen atom, and when X2 is a hydrogen atom, X1 is not a hydrogen atom; and m is an integer of 0, 1 or 2, and n is an integer of 0, 1, 2 or 3.
Abstract:
The invention relates to a method of manufacturing a jack comprising a step of punching a sheet metal by which a plurality of contact piece elements to be individual contact pieces of a jack are formed into a state of being partially connected to one another and arranged in parallel, a step of bending both ends of each contact piece element downward, a step of cutting off each contact piece element arranged in parallel by a cutter to form individual contact pieces, and a step of forcedly incorporating each contact piece into a jack body positioned right under a punching stroke of the cutter positioned right under a punching stroke of the cutter used in the cutting step whereby a complete automatization of the manufacturing is attained, considerably increasing productivity and decreasing an equipment cost as much.
Abstract:
The invention discloses a connector for printed circuit board comprising a first contact piece with a spring contactor, a second contact piece with a spring contactor, and a body in which these spring contactors can be arranged at their positions deviated from each other in lengthwise direction and a printed circuit board can be inserted in and out obliquely between contact points of the spring contactors, characterized in that when the printed circuit board inserted obliquely in the body is situated in substantially horizontal state, the printed circuit board is tightly contacted with the contact points of the spring contactors, thereby electrical connection between the printed circuit board and the first and second contact pieces being exactly and appropriately insured over a long period irrespective of frequency in insertion in and out of the printed circuit board.
Abstract:
This invention discloses a connector for printed board connection comprising a first body having a plurality of first contacts to be connected with one printed wiring and a second body facing to the first contacts of the first body, in which the first body and the second body are turnably and detachably connected with each other, each end of the first contacts and each end of the second contacts are brought into contact with each other within a turning range, so that the printed boards may be easily and speedily connected with each other and that the arrangement of the printed boards may be freely selected while electrical connection therebetween being assured, maintenance being easily carried out and cost being saved thereby.
Abstract:
The invention discloses a method of manufacturing a jack comprising a step of punching a sheet metal by which a plurality of contact piece elements to be individual contact pieces of a jack are formed into a state of being partially connected to one another and arranged in parallel, a step of bending both ends of each contact piece element downward, a step of cutting off each contact piece element arranged in parallel by a cutter to form individual contact pieces, and a step of forcedly incorporating each contact piece into a jack body positioned right under a punching stroke of the cutter used in the cutting step whereby a complete automatization of the manufacturing is attained, considerably increasing productivity and decreasing an equipment cost as much.
Abstract:
Key information from an attendant console is transferred to a telephone exchange in a bit serial manner, and line status information from the telephone exchange is also transferred in a bit serial manner and in a time-shared manner. At the request of the attendant console, the line status information is transferred from the telephone exchange to the attendant console in a bit serial manner, and subjected to serial-parallel conversion to obtain parallel signals for driving lamp indicator portions so as to provide an indication of the line status information. The number of signal lines connected to the attendant console is markedly reduced and, in the case of telephone number modification or the like, proper steps can be taken immediately.