Power source for electronic tuning tuner

DETAILED DESCRIPTION It is therefore an object of the present invention to overcome the above-mentioned disadvantages in the prior art.
It is another object of the present invention to provide a power source for an electronic tuning tuner, in which a source voltage necessary for tuning can be reliably obtained in the situation that the horizontal deflection circuit is stopped when a television signal is not received without bringing about any disadvantage such as high cost, etc.
It is a further object of the present invention to provide a power source for an electronically tuned tuner, in which a source voltage necessary for a tuning voltage generating circuit can be reliably obtained by using a voltage source from a fly-back transformer in the case of reception of television signals and by using another low voltage source in the case other than the reception of television signals.
To attain the above objects, according to an aspect of the present invention, the power source for an electronically tuned tuner comprises an electronic tuning front end, a tuning voltage generating circuit, a horizontal deflection circuit, a fly-back transformer, and a power source change-over circuit connected between the fly-back transformer and the tuning voltage generating circuit.
The change-over circuit is arranged to operate such that a source voltage is applied to the tuning voltage generating circuit from the fly-back transformer when television signals are received and from a DC power source of a voltage lower than an output voltage of the fly-back transformer in the case other than the reception of television signals.
These and other objects, features and advantages of the invention will become more apparent upon a reading of the following detailed description and drawings.