The radio (options)

 

The invention relates to radio engineering. The technical result consists in the use of various types of resonant LC circuits. The invention consists in that in the known radio that contains the antenna, detector, amplifier audio frequency of the resonant LC-circuit, switch, N logical inverters, N divider, N LEDs, the current-limiting resistor, the power source and the resistor junction, to prevent the voltage at the resonant LC-circuit entered a blocking capacitor. 2 N. p. F.-ly, 2 Il.

The invention relates to electronic circuits of General application, namely the nodes settings and switch the resonant circuits of the radio receiving or transmitting devices that use switches ranges or switches fixed frequencies.

Known radios, in which the display switching ranges is carried out by visual determination of the position of the handle, a key or button switch (Kruchinin I. T. and other Radios on the transistors. - M.: Energy, 1974, S. 47, Fig.2.10). In these devices to configure a resonant LC-circuit in each of the bathrooms settings instead of the variables used fixed capacitors or constant inductance. Such devices are functionally simple and do not require special mechanical parts or electronic circuits of the display.

Their disadvantage is that they require special design solutions switch, providing a clear enough indication and conspicuity included range when operating the radio. In addition, in low light conditions, for example, in the dark, it is often impossible to visually determine the enabled range.

Also known radios, in which the indication is included range is implemented by a special electronic circuit, for example, sensory or quotienting type light-emitting elements (Belov, I. R. and other Household receiving and amplifying the radio: a Handbook. - M.: Radio and communication, 1985, S. 54, Fig.1.43).

Such devices from the operational point of view of effective and provide a visual indication, however, they are complex and time-consuming to manufacture.

Closest to the proposed invention, as to the technical essence and the circuitry is the radio, which for indicating one of the N set of ranges used N LEDs, managed N logical investormarkedet ranges radio // Radio. - 1998. No. 7. - S. 18, Fig.1). In this device, each of the inputs of the inverters through a resistive voltage divider is connected with the corresponding contacts of switch ranges, and its common contact through the resistor junction is connected to the positive pole of the power source.

The disadvantage of this radios are limited possibilities of its application, namely, it can be used in the resonant circuits of the type in which to configure there are two series of range of the capacitor, the capacitance of the first of which is constant and is determined by the selected range, and the capacitance of the second variable and performs the function of the tuning of the resonant LC-circuit.

This precludes the use of devices in circuits where to configure or fixed switching frequency is only one contour capacitor.

The aim of the invention is to expand the functionality of the application proposed technical solutions in the radio with different types of resonant LC circuits, resulting in the possibility of a wider use in radio engineering, electronic and electrical circuits, the debate entered a blocking capacitor, precluding the flow of direct current through the contour inductance from the power source, and under item 2 of the claims in the device entered N inductances parallel resonant circuit.

The invention under item 1 of the formula is that one of the conclusions of the inductance of the parallel LC circuit connected to the antenna connected to the input of the detector and the common contact of the switch through a resistor junction is connected with the positive pole of the power source, and put him in a blocking capacitor connected between the other output inductance LC-circuit and a common bus, the N inputs of voltage dividers connected in parallel to the corresponding N-band capacitors, the first pins connected to a shared bus, and the second - with the corresponding N-contacts of the switch.

The invention under item 2 of the formula lies in the fact that you have entered N inductances of the resonant LC-circuit of the first terminals are connected with the corresponding N-contacts of the switch, and N a blocking capacitor between the respective second pins N inductances of the resonant LC-circuit, a capacitor which is connected between the antenna and the common bus and the N inputs of the dividers is zoned inductance and a blocking capacitor, a common contact of the switch is connected to the antenna connected to the input of the detector, in addition, the positive pole of the power source through the resistor junction is connected to the common contact of the switch.

In Fig.1 and 2 shows the variations of the radio. They differ in that the toggle elements that change the frequency settings of the device used in the range of capacitors or range inductance, respectively.

The radio of Fig.1 includes an antenna 1 connected to the input of the detector 2, an output connected to the input of the amplifier audio frequency 3. One of the conclusions of the inductance 4 parallel resonant LC circuit connected to the antenna 1, and the capacitive circuit the circuit consists of N-band capacitors 5.1, 5.2,...5.N, some conclusions which are connected to a common bus 6, and the other with contacts 7.1, 7.2,...7.N switches, respectively, a common contact 7 which is connected to the antenna 1. The device includes logic inverters 8.1, 8.2,...8.N, the inputs of which are connected respectively to the outputs of the voltage dividers 9.1, 9.2,...9.N, and outputs connected to the cathodes of the LEDs 10.1, 10.2,...10.N, respectively. The anodes of these diodes are connected to the first output of the current-limiting resistor 11, stone 1. Another output inductance 4 through a blocking capacitor 14 is connected to the common bus 6, and inputs the voltage dividers 9.1, 9.2....9.N are connected in parallel to the corresponding range capacitors 5.1, 5.2,...5.N. Capacitors 5.1, 5.2,...5.N can be a variable capacitor (for the smooth adjustment of the resonant LC-circuits within the selected range), and constant (at a fixed setting of the resonant LC circuits).

The radio of Fig.2 includes an antenna 1 connected to the input of the detector 2, an output connected to the input of the amplifier audio frequency 3. The capacitor 5 parallel resonant LC circuit connected between the antenna 1 and the common bus 6, and an inductive circuit the circuit consists of N range of inductances 4.1, 4.2,...4.N, the first conclusions which are connected with contacts 7.1, 7.2,...7.N switches, respectively, a common contact 7 which is connected to the antenna 1. The device contains a logical inverters 8.1, 8.2,...8.N inputs are connected to the corresponding outputs of the voltage dividers 9.1, 9.2,...9.N, and outputs to the cathodes of the LEDs 10.1, 10.2,...10.N. The anodes of these diodes are connected to the first output of the current-limiting resistor 11, the second terminal of which is connected to the positive pole of the power source 12 and through Kirousis capacitors 14.1, 14.2,...14.N connected to a common bus 6. The inputs of the voltage dividers 9.1, 9.2,...9.N are connected in parallel to the corresponding N circuits, each of which consists of a series connection of inductance range 4.1, 4.2,... or 4.N and a blocking capacitor 14.1, 14.2,... or 14.N, respectively. The capacitor 5 can be as variable capacity and constant. The device according to Fig.2 is used, usually in automobile receivers, where continuous or discrete setting to the station by changing the values of the inductances 4.1, 4.2,...4.N.

The radio of Fig.1 operates as follows. When setting the range switch in the first position for the closure of the contacts 7.1 and 7, the resonant frequency of the LC-circuit is determined by the value of inductance 4 and the value of the capacitance range capacitor 5.1. Through a fairly large resistor junction 13 on the contact 7.1 range switch receives a constant voltage from the source 12. A blocking capacitor 14 is excluded bypass this voltage through the inductor 4 on a common bus 6. The voltage from the contact 7.1 is input to the voltage divider 9.1. With its output voltage as the value of the logical unit enters Nadiad 10.1 starts to leak current, the value of which is determined by the resistance of the current-limiting resistor 11 and the voltage of power source 12. As a result of its glow defines selected, in particular, first, the range of the radio.

Further, if closed contacts 7.2 and 7 of the switch, the voltage from the power source 12 to the input of the voltage divider 9.2, and with the input of the divider 9.2 voltage is removed. The glow of the led 10.1 stops and turns on the led 10.2, which shows off the first range and the second range settings of the radio. These same processes are repeated for any subsequent changes in the position of the switch, causing the glow and the disabling of the respective N LEDs that indicate one or the other included a range or a fixed setting of the radio.

For the normal functioning of the radio on the circuit of Fig.1 it is necessary that the capacitance of the blocking capacitor 14 was far larger than any of the contour of the capacitors 5.1, 5.2,...5.N, because only in this case, the resonant frequency of the LC circuit will not change from the introduction of the capacitor 14 in the circuit of the radio.

The radio on the circuit of Fig.2 works sledujushi and 7, the resonant frequency of the LC-circuit is determined by the capacitance value of the capacitor 5 and the value range of inductance 4.1.

Through a fairly large resistor junction 13 on the contact 7.1 range switch from the power source 12 is supplied a constant voltage. A blocking capacitor 14.1 eliminates bypass this voltage on a common bus 6 through the inductance 4.1. The voltage from the contact 7.1 is input to the voltage divider 9.1. With its output voltage in the form of a logical unit to the input of the inverter 8.1, which makes appearance at the output voltage logical zero. Through the led 10.1 starts to leak current, the magnitude of which is determined by the resistance of the current-limiting resistor 11 and the voltage of power source 12. Its glow determines the selected first range of the radio.

Further, if closed contacts 7.2 and 7 of the switch, the voltage from the power source 12 to the input of the voltage divider 9.2, and with the input of the divider 9.1 voltage is removed. The glow of the led 10.1 stops and turns on the led 10.2 that determines the inclusion of the second tuning range of the radio. These same processes are repeated when the love is the iodines, pointing to on the range. When this blocking capacitors 14.2,...14.N exclude bypass a constant voltage, which in turn come in contact 7.2,...7.N when switching ranges, through inductance range 4.2,...4.N on a common bus 6. This requires that the capacity of any of the blocking capacitors 14.1, 14.2,...14.N was far larger than the contour of the capacitor 5, as only in this case, the resonant frequency of the LC circuit will not change from the introduction into the circuit of the capacitor 14.

For both schemes the radio you want the resistor 13 and the total resistance of the resistor dividers 9.1, 9.2,...9.N were large enough and had no shunting effect on the quality factor of the resonant LC-circuit. This condition is ensured if the inverters 8.1, 8.2,...8.N to use CMOS logic circuits, such as a series of 564. They have a large input impedance and low input flowing and flowing currents lying in the range of tenths-hundredths increasing volume of computer. Such small currents determine the possibility of using the radio resistors with resistance values of hundreds of kilo-ohms, the unit Megohm, that practically does not cause reduction of q Rakim way the use of the proposed technical solution allows to apply it in a resonant LC circuits of various types, schemas, which can contain multiple series, and one dual capacitor. It extends the functionality of application of the radio.

Claims

1. The radio containing the antenna, the detector output connected to the input of the amplifier audio frequency parallel resonant LC-circuit, and a capacitive circuit circuit contains N range of capacitors, as well as N logical inverters whose inputs are connected to the N outputs of the voltage dividers, and the outputs are connected to the cathodes of the N light-emitting diodes, the anodes connected to the first output of the current-limiting resistor, a second output connected to the positive pole of the power source, characterized in that one of the conclusions of the inductance of the parallel LC circuit connected to the antenna connected to the input of the detector and the common contact of the switch, through the resistor junction is connected with the positive pole of the power source, and it introduced a blocking capacitor connected between the other output inductance LC-cartoonization, the first pins connected to a shared bus, and the second - with the corresponding N-contacts of the switch.

2. The radio containing the antenna, the detector output connected to the input of the amplifier audio frequency of the resonant LC-circuit, and N logical inverters whose inputs are connected to the N outputs of the voltage dividers, and the outputs are connected to the cathodes of the N light-emitting diodes, the anodes connected to the first output of the current-limiting resistor, a second output connected to the positive pole of the power source, characterized in that it introduced N inductances of the resonant LC-circuit, the first pins connected to the respective N contacts of the switch, and N blocking capacitors, included between the respective second pins N inductances of the resonant LC-circuit, a capacitor which is connected between the antenna and the common bus and the N inputs of voltage dividers connected in parallel to the corresponding N circuits, consisting of a series connection of inductance range and a blocking capacitor, a common contact of the switch is connected to the antenna connected to the input of the detector, in addition, the positive pole of the power source through the resistor junction connection is

 

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