This invention involves a novel balance type phase comparator circuit which is relatively insensitive to temperature changes, and which circuit is a balanced type in which no voltage change appears at the output when the input signal is zero, even if a reference signal is applied thereto. The circuit requires no capacitors and is particularly suited for IC circuits. One particular application of the invention is for color demodulation in a color television receiver where the input signal is the ...

Magnetic recording and reproducing apparatus having a first direct current motor to drive the rotary magnetic heads and the capstan, and a second direct current motor to drive the take-up reel during recording and reproducing and the supply reel during rewind. Means are also provided to couple the second motor to the capstan during playback of the recorded tape. The phase of rotation of the first motor is controlled during the recording operation. At the same time, the speed of the second motor ...

A solid-state horizontal deflection circuit including a high voltage applying circuit for a television receiver or the like in which a gate-controlled switching device is used for applying a deflection current to a horizontal deflection coil to perform horizontal beam scanning and another semiconductor switching device is used for applying a pulse voltage to a flyback transformer to produce a high voltage supplied to a cathode ray tube, and further a couple of diodes connected in series are prov...

A cathode ray tube envelope consisting of a neck portion, a funnel portion and a panel portion having a rectangular screen is assembled with reference to the round portion of the funnel portion. The cross section of the round portion is circular and accordingly the geometric center of the funnel portion can be detected easily.

A signal control circuit which includes an amplifying transistor connected to an input circuit to receive an input signal. A constant reference bias voltage is produced across a diode connected to the input circuit and signals are connected from the input circuit to the transistor by a resistor. A controllable impedance is connected at a point between the resistor and the transistor so that by controlling the impedance the current gain of the amplifier is linearly controlled over a wide range.

A system for automatically skipping unused channels in tuning through a sequence of used and unused channels. The tuning means causes a tuning signal to be applied to the system to allow a free-running pulse generator to supply pulses to an actuator as long as the tuning signal continues to be supplied. The actuator enables each of a series of channel control means one at a time and in order, changing from one to the next at the occurrence of each pulse. In order to keep the tuning from stopping...

A gain control circuit having a pair of first and second NPN-type transistors whose emitters are grounded and whose collectors are connected with each other and through a constant current source to a DC source. A third NPN-type transistor has its collector connected to the DC source, its emitter connected to the bases of the first and second transistors through separate resistors and also grounded through a resistor connected in parallel with a capacitor, and its base connected to the collector ...

In a color picture tube of the single-gun, plural-beam type in which a central beam and two side beams originate in a common horizontal plane and are all made to pass through the center of an electron lens for focussing the beams on the color screen with the central beam emerging from the lens along the optical axis of the latter and the side beams emerging from the lens along paths that are oppositely divergent from the axis, the divergent side beams are acted upon by an electrostatic convergen...

A receiver for stereophonic program signals which employs a narrow-band intermediate-frequency signal extracting circuit and a noise signal detecting circuit for producing a gate signal. The receiver further includes a change-over switch which is controlled by the gate signal to select the monaural or stereophonic mode of operation so that the receiver may achieve monaural reproduction when noise in the received signal exceeds a predetermined level.

A circuit in which signal gain is controlled independently of the quiescent direct current level. The quiescent current flows through a transistor connected as part of a constant current circuit and is modulated by signals applied to the base. The constant current circuit is connected in series with a pair of differentially connected transistors, both of which are connected in series with the load. The percentage of the total direct current through the differentially connected transistors is con...