The BERLIN 2000 (TESLA) TYPE 4 159 AB-1 is a 12 inches B/w portable television with 6 programs preselection keyboard and potentiometers tuning search system.
The use of voltage-variable diode-capacitors, such as varactor diodes, permits the electronic tuning of radio receivers and television receivers by the use of DC control voltages; so that the tuning elements no longer need to be intimately associated with the tuner. Thus, the tuned circuits of the tv receivers may be located remotely from the devices used to provide the necessary DC tuning voltages. In addition, the compact size of the voltage-variable diode-capacitor tuning circuits makes it desirable to use such tuning circuits in many tv applications which formerly used mechanically adjusted variable capacitors or the like as the tuning elements.
To employ voltage-variable diode capacitors in pushbutton tvs, however, especially in multiband pushbutton tv sets , a problem exists in providing a "memory," so that operation of a pushbutton will provide consistent tuning of the tv receiver to the station which is to be selected by that pushbutton. In addition it is necessary to provide some means for providing the initial tuning of the tv receiver for each pushbutton location in a manner which is reliable and inexpensive.
Power was obtained Both Mains and 12volt source.Recently, it has become more popular than ever to watch TV in a car as the number of cars increases. In general, a storage battery of 12 volts is used in small cars while one of 24 volts is used in large cars so that there is a disadvantage that a separate power supply device is required for driving a TV set in compliance with the respective battery used in the car. The present invention relates to a power supply circuit of a television receiver used in an automobile, and in particular to a power supply circuit of a television receiver which enables two different voltages from two kinds of supply respectively mains at 220v and dc 12v.
Black and white portable television set equipped with a semiconductor. Screen with a diagonal of 31 cm. A channel selector for I.-V. band, 8 presets mechanically actuated. Plastic cabinet, speaker and all the controls to the right of the screen. Possibility of mains or 12V car battery.
The set is a Czechoslovakia made type very solid with modular chassis entirely based on TESLA components.
The use of voltage-variable diode-capacitors, such as varactor diodes, permits the electronic tuning of radio receivers and television receivers by the use of DC control voltages; so that the tuning elements no longer need to be intimately associated with the tuner. Thus, the tuned circuits of the tv receivers may be located remotely from the devices used to provide the necessary DC tuning voltages. In addition, the compact size of the voltage-variable diode-capacitor tuning circuits makes it desirable to use such tuning circuits in many tv applications which formerly used mechanically adjusted variable capacitors or the like as the tuning elements.
To employ voltage-variable diode capacitors in pushbutton tvs, however, especially in multiband pushbutton tv sets , a problem exists in providing a "memory," so that operation of a pushbutton will provide consistent tuning of the tv receiver to the station which is to be selected by that pushbutton. In addition it is necessary to provide some means for providing the initial tuning of the tv receiver for each pushbutton location in a manner which is reliable and inexpensive.
Power was obtained Both Mains and 12volt source.Recently, it has become more popular than ever to watch TV in a car as the number of cars increases. In general, a storage battery of 12 volts is used in small cars while one of 24 volts is used in large cars so that there is a disadvantage that a separate power supply device is required for driving a TV set in compliance with the respective battery used in the car. The present invention relates to a power supply circuit of a television receiver used in an automobile, and in particular to a power supply circuit of a television receiver which enables two different voltages from two kinds of supply respectively mains at 220v and dc 12v.
Black and white portable television set equipped with a semiconductor. Screen with a diagonal of 31 cm. A channel selector for I.-V. band, 8 presets mechanically actuated. Plastic cabinet, speaker and all the controls to the right of the screen. Possibility of mains or 12V car battery.
The set is a Czechoslovakia made type very solid with modular chassis entirely based on TESLA components.
TESLA (from "TEchnika SLAboproudá" - which means "Low voltage technology") was a large, state-owned electrotechnical conglomerate in the former .
The company was established as Elektra on 18 January 1921 and renamed TESLA on 7 March 1946. TESLA had a state-sponsored monopoly on electronics production in communist Czechoslovakia, and produced nearly all electronic products in the country until 1989. Many subsidiaries were created, including those at Liptovský Hrádok, Hradec Králové, Pardubice, Žďár nad Sázavou, Bratislava, and Nižná. Later, some of them were transformed into independent state-owned companies.
While the company's wide range of production was impressive, quantity usually did not meet the needs of industrial customers. Many products gradually became obsolete simply because they were not updated; e.g. one particular type of diode was manufactured for over 30 years without modifications.
Other products, e.g. some kinds of SCRs or Power-Transistors were competitive with the world market and so TESLA was the supplier for all eastern Europe Countries. Some high quality products were even exported to western countries for example turntables NC 470 or NC 500 under mark Lenco.
TESLA had to contend with both foreign and new domestic competition after the fall of communism in Czechoslovakia, and had difficulty competing effectively, which resulted in dramatic downsizing and privatization of the majority of its stores and production facilities. TESLA's logo is a rare sight in the present-day Czech Republic and Slovakia, as only a few of its subsidiaries have survived. One of its former subsidiaries, JJ Electronic is known for its manufacture of vacuum tubes and TESLA Litovel is known for its manufacture of high end turntables known as Pro-Ject.
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