Abstract: A current source circuit includes a series-circuit connected between a power source node and ground and comprising a reference current source circuit, a first transistor Q1 of an NPN type having its collector and base connected to each other and a second transistor Q2 having a multi-emitter area (N) and having a multi-emitter configuration. The current source circuit further includes a third transistor Q3 of an NPN type connected at its collector to the power source node, at its base to the base of the first transistor Q1 and at its emitter connected to the base of the second transistor and has an emitter area (M) and an input current source circuit connected between the emitter of the third transistor Q3 and ground to allow a flow of an input current Iin.

Abstract: A buffer circuit including current sources and switches to connect and disconnect current sources to an output node. The switches are controlled by voltage detectors for comparing an input signal with a reference level. When the reference level is a predetermined value, the amplitude of an output signal swings up to V.sub.CC and swings down to V.sub.EE.

Abstract: A portable electric apparatus includes an LCD panel for displaying and obtaining information by using a pen member. The apparatus provides for a storage portion of the pen member on the surface of the portable electric apparatus. The storage portion provides for a holding member which holds the pen member in a stable manner. The holding member is made of an elastic material and covers the pen member in the storage portion. The pen member has a flat oval shape in cross-section so as to be stable when stored in the storage portion.

Abstract: Disclosed is a pilot signal cancelling system employed in an FM stereo receiver which does not cause deterioration of the S-N ratio.

Abstract: A matrix circuit includes a first resistor having one end connected to receive a current signal and another end connected to a first output node, a second resistor having one end connected to the one end of said first resistor, a first bipolar transistor having a first collector connected to the another end of said second resistor, a first emitter connected to a circuit ground and a first base connected to said first collector, and a second bipolar transistor having a second collector connected to a second output node, a second emitter connected to said circuit ground and a second base connected to said first base.

Abstract: A buffer circuit comprises an interface node, a bipolar transistor having a collector connected to a first power source, an emitter connected to a second power source, and a base, for transferring a signal supplied to and from the interface node, and a diode structure formed between the emitter and base of the bipolar transistor, the diode structure containing a PN junction reversely coupled across the emitter-base junction of the bipolar transistor.

Abstract: A reactance control circuit comprising a variable reactance circuit whose reactance is determined by the currents flowing to first and second differential transistor circuits, a differential amplifier for producing first and second currents in accordance with an input voltage, and a DC amplifier circuit for amplifying the first and second currents and supplying the amplified currents to the variable reactance circuit in order to control the currents flowing to the first and second differential transistor circuits. The DC amplifier circuit includes first and second transistors for supplying output currents to the variable reactance circuit, and a base potential control circuit for, when the first and second currents are equal to each other, supplying a predetermined low potential to the bases of the first and second transistors so that the currents flowing to the first and second transistors are both reduced.

Abstract: A tone control circuit having a first differential amplifier and a second differential amplifier. The first differential amplifier comprises first and second transistors whose emitters are connected. The second differential amplifier comprises third and fourth transistors whose emitters are connected. The base and collector of the third transistor are connected to the base of the second transistor and the collector of the first transistor, respectively. The base and collector of the fourth transistor are connected to the base of the first transistor and the collector of the second transistor, respectively. A demodulated signal is input to the differential amplifier, and also to the second different amplifier via a band-pass filter.

Abstract: An output circuit built in a semiconductor integrated circuit having an output terminal comprises a first transistor having a base and a collector connected to the output terminal, a second transistor having a collector connected to a power source circuit, an input signal source connected to the emitters of the first and second transistors, and a DC amplifier circuit having an input end connected to the output terminal and an output end connected to the base of the second transistor, and operated according to a preset bias potential. A signal occurring at the output terminal is fed back to the base of the second transistor via the DC amplifier circuit.

Abstract: A stereo pickup cartridge of a movable magnet type comprising three movable magnets. The magnetic axis of each of the magnets is orthogonal to the cantilever shaft.

Abstract: A stereophonic electromagnetic pickup cartridge in which each of the right- and left-channel yokes is formed by folding a thin strip of a magnetic material over itself many times like pleats into a U-shape; coils are mounted on the yokes; the bases of the yokes are crossed so that the bases of the yokes are respectively disposed along the lines which are crossed by 90.degree. respectively with the axes of the maximum sensitivity of the right- and left-channels are formed; and an armature is disposed at the open ends of the yokes. Mass production at less costs of high-quality yokes with minimum eddy current loss becomes possible.

Abstract: An electromagnetic pickup cartridge in which a cantilever with a stylus tip at the free end thereof is extended perpendicularly from the center of one major surface of an armature which is partially embedded in a holder which is made of a high molecular weight compound, which serves as a suspension part and in turn is mounted through a damper in a sleeve. Since the armature is not needed to be formed with a center aperture, the fabrication cost can be reduced.

Abstract: A magnetic type stereophonic pickup cartridge wherein four block-shaped pole pieces which are simple in construction and design and made of ferrite are assembled into a pole piece assembly. The eddy-current loss may be minimized, and the magnetic circuits of the right and left channels may be made completely symmetrical with the same length of the magnetic path, whereby the high sensitivity and flat frequency response characteristic may be ensured over the whole audible range.

Abstract: In a stereophonic pickup cartridge which derives two or more than two electric signals from a stereophonic sound recording disk of so-called 45.degree. -- 45.degree. type, there is provided a displacement-type pickup cartridge having an improved vibration transmission structure.