Keywords: TL082, sine wave generating circuit
Simple and easy sine wave signal generator TL082 SINE-WAVE GENERATOR
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1. Circuit diagram and PCB design String wave signal generator circuit schematic shown in the above figure, the figure below is a power supply circuit that is supported. The entire circuit can be welded on the breadboard, and can also be self-made PCB maps. The effect will be more. 2. Circuit Working principle and component selection are visible by the above view, and the sine wave signal generator circuit is composed of two levels. The first stage is a RC Wenlians oscillator, and the signal frequency is coarsely adjusted by double-knife four-rising wave switch ZK switching capacitance, and the frequency of each gear is 10 times. The signal frequency is performed by the double connecting potentiometer RP1, and the frequency is continuously adjustable within the gear frequency range. RP2 is a multi-circular potentiometer that adjusts it to improve waveform distortion. When R4 is changed to a resistor having a resistance of 3K, the RP2 is adjusted, and it is possible to clearly see that the RC Wenshi Circuit's custody conditions and improvement of the waveform distortion. The second stage of the circuit is a reverse proportional amplifier, which adjusts the single-link potentiometer RP3 to change the amplitude of the output signal. The voltage amplification of the grade is 5 times, the minimum is zero, and the adjustment RP3 can clearly see the sine wave signal. From an unity until the increase in amplitude. Of course, if this level is used to adjust the RP3, the effect of the stage circuit on the pre-stage signal source circuit is significantly reduced because the input resistance of the inversion ratio amplifier is large. Most of the reason.
The oscillation frequency of the RC Wen's bridge signal generator is determined by the formula F = L / 2 RC. By calculation, this circuit can be generated by 10 Hz. 10okhz covers the entire audio range, so if the output of the source is connected to an audio power amplifier, the vocality of the speaker can understand the different reflection of the human ear to the audio wave, audio wave, and ultrasonic waves. Of course, if the output of the signal generator is connected to an oscilloscope, there is a more intuitive understanding of the high and low of the frequency.
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3. There are three difficulties in component assembly and debug component assembly. One is that the connection of the capacitance of each lead and the RC skewide network on the band switch is correct, and the second is that the pin identification of integrated op amps is correct, and the third is three-end integrated regulation. The pin function of blocks 7812 and 7912 is different, to be correctly identified. Two electrodes between each throw on the double-knife four-throw band switching is a pair of correspondence, and should be connected to a pair of different capacitances. The TL082 is a high-speed precision double operational amplifier, which has a double-column-in-in-pack package, with a dot on the plastic surface, and its corresponding pin is 1 pin, then arranged in the counterclockwise order. The power supply plate and the signal generator circuit board are used to connect to the power supply to ensure the supply positive and negative 12V DC. The pins of the three-end integrated stabilizing block 7912 are respectively, the input and output, and the pins of 7812 are inputs, ground, and output from left to right, respectively. After the circuit is assembled, you can debug after the check is correct. First, the power supply is debugged, and the primary of the transformer is connected to 220V AC. The output of the three-end integrated regulator circuit is directly measured by the DC voltage gear of the multimeter. As long as the device itself and the installation are not problematic, there should be DC positive and negative 12V voltage. Output, if there is no output voltage, the input end of the triplet integrated stabilizing blocks 7812 and 7912 should be checked, respectively, with a DC voltage of about 15V. If there is, it is 7812 and 7912 problems. It should be carefully checked whether the 7812 and 7912 connections are correct. If the connection is correct, it is definitely the problem with the 7812 and 7912 itself, and the replacement method can be used to determine. After the power is debugging, the power supply is connected to the board, and the first use of the multimeter to measure the integrated op amp 8 feet and 4 foots, there is a DC voltage of the fixed-negative 12V, if the voltage is normal, then the output terminal of the signal generator can be The oscilloscope is connected, select the frequency and amplitude stop of the oscilloscope, and then adjust the RP2, you can see the sinusoidal waveform, and adjust the distortion of this sine wave to minimize. Turn the band switch, the signal frequency should have a significant change, it is necessary to adjust the oscilloscope to ensure the tracking of the signal, and then adjust the multi-circle potentiometer RP2 to ensure that there is a basic waveform that is substantially different in either wave band. At each band, when the dual connectivity potentiometer RP1 is adjusted, the slow change of the signal frequency can be seen. Adjust the single-link potentiometer RP3, it can clearly see the change in signal amplitude. If the signal distortion is increased, the signal distortion should be carefully adjusted, so that the signal is not distortion.
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