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UNIVERSAL LC GENERATOR
Radio, 1979, No. 5
The generator, the circuit of which is shown in the figure, is intended for measuring equipment. An important advantage of this generator is the ability to use resonant circuits with virtually any L / C ratio. So, it works equally steadily if the inductance of coil L1 varies from 50 μH to 100 mH, and the capacitance of C1 is from 50 pF to 5 μF. For example, with an inductance of L1 = 50 μG and capacitance C1 = 5 μF, the generated frequency will be about 10 kHz, and with the same inductance and C1 = 50 pF - 3.2 MHz. In addition, to the number of advantages of this generator should be attributed a small voltage on the LC-circuit - about 100 mV. In some cases this is important, for example, when measuring varicap parameters.
The generator is made on transistors V1 and V2. The cascade on the transistor V3 is a preliminary amplifier, the signal from which is fed to the output amplifier (transistor V8 ) and to the automatic level control unit of the output signal of the generator. Since the preamplifier comes directly from the generator oscillator circuit, the AGC unit maintains a constant voltage and on this circuit. The automatic level control unit consists of a rectifier on the diodes V4 and V5, made by the doubling circuit, the direct current amplifier on the transistor V7 and the regulating transistor V6.
As soon as for some reason the voltage at the output of the generator changes, for example, it will increase, then a mixture on the basis of the transistor V7 will increase. This, in turn, will lead to a decrease in current through the transistor V6 (and hence through the transistors of the generator V1, V2), and the voltage at the generator output will decrease to the original value.
The output voltage remains practically constant when the supply voltage varies from 3.5 to 15 V. It is convenient to choose it equal to 5 V. In this case, the signal level at the output of the generator will be compatible with the devices of transistor-transistor logic.
In the generator, you can use any silicon high-frequency transistors, and transistors V1-V3 must have a sufficiently large current transfer ratio (not less than 150). In the event that parasitic high-frequency oscillations occur, the resistance of the resistor R2 should be slightly increased.
"Funkshau" (FRG), 1978, No. 18
The transistors KT361B, G (V1, V2, V3) and KT315B, G [V6, V7, V8 ] can be used in the generator, the diodes (V4, V5) can be of the KD503A type.
UNIVERSAL LC GENERATOR
Radio, 1979, No. 5
The generator, the circuit of which is shown in the figure, is intended for measuring equipment. An important advantage of this generator is the ability to use resonant circuits with virtually any L / C ratio. So, it works equally steadily if the inductance of coil L1 varies from 50 μH to 100 mH, and the capacitance of C1 is from 50 pF to 5 μF. For example, with an inductance of L1 = 50 μG and capacitance C1 = 5 μF, the generated frequency will be about 10 kHz, and with the same inductance and C1 = 50 pF - 3.2 MHz. In addition, to the number of advantages of this generator should be attributed a small voltage on the LC-circuit - about 100 mV. In some cases this is important, for example, when measuring varicap parameters.
The generator is made on transistors V1 and V2. The cascade on the transistor V3 is a preliminary amplifier, the signal from which is fed to the output amplifier (transistor V8 ) and to the automatic level control unit of the output signal of the generator. Since the preamplifier comes directly from the generator oscillator circuit, the AGC unit maintains a constant voltage and on this circuit. The automatic level control unit consists of a rectifier on the diodes V4 and V5, made by the doubling circuit, the direct current amplifier on the transistor V7 and the regulating transistor V6.
As soon as for some reason the voltage at the output of the generator changes, for example, it will increase, then a mixture on the basis of the transistor V7 will increase. This, in turn, will lead to a decrease in current through the transistor V6 (and hence through the transistors of the generator V1, V2), and the voltage at the generator output will decrease to the original value.
The output voltage remains practically constant when the supply voltage varies from 3.5 to 15 V. It is convenient to choose it equal to 5 V. In this case, the signal level at the output of the generator will be compatible with the devices of transistor-transistor logic.
In the generator, you can use any silicon high-frequency transistors, and transistors V1-V3 must have a sufficiently large current transfer ratio (not less than 150). In the event that parasitic high-frequency oscillations occur, the resistance of the resistor R2 should be slightly increased.
"Funkshau" (FRG), 1978, No. 18
The transistors KT361B, G (V1, V2, V3) and KT315B, G [V6, V7, V8 ] can be used in the generator, the diodes (V4, V5) can be of the KD503A type.
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