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Digital DC voltage-stabilized source
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This NC DC regulator power total six Department points, output voltage of regulation is through +,-two key operation, step into voltage precise to 0.1V control reversible counter respectively for added, reduction count, reversible counter of II into business digital output points two road run: way for drive digital displayed circuit, precise displayed current output voltage value; another way into number die conversion circuit (D/A conversion circuit), number die conversion circuit will digital volume by proportion, conversion into simulation voltage, then after shot very followed device control, adjustment output level, Output stable DC voltage. In order to achieve the above sections to work properly, you need 15V and 5V DC power supply, and the a group of 12V~17V that are not regulated DC voltage. NC power supply which is mainly under control voltage for this group, so the output of 0~9V stable adjustable DC voltage.
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Digital frequency meter
no vote
Optimization of the method of frequency measurement more and more attention. Basic principle of frequency meter with a frequency stability of high-frequency source as reference clock frequency of the measured signal. Usually calculated number of pulse per second signal to be detected, at which point we call gate time is 1 second. Gate time can also be greater than or less than a second. Gate time, the longer the frequency values are more accurate, but Gates did not measure the frequency the longer interval is longer. Shorter the gate time, measured the value of the frequency of refresh more quickly, but the measured frequency accuracy is affected. In this paper. Digital frequency meter is an instrument of digital displays the frequency of the signal to be measured and the measured signal is a sine wave, square wave or other periodic signal. With appropriate sensors, you can test multiple physical quantities, such as mechanical vibration frequency
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NC power supply
no vote
A great NC power. the cost is a bit high! Two output: 1:0-30V/4A 2:5V/1.5A (fixed output) Voltage resolution 0.458mV, the current resolution 0.076mA Voltage stepper 0.0073V, actual control using 0.1V
Found in the making; C37 polarity painting upside down! There is a reset circuit is 51 and AVR are compatible, not welded up all four originals, with what kind of reset chip welding circuit! I inform you!
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Design of digital storage oscilloscope
no vote
In order to test high-frequency analog signal, high speed a/d conversion technology must be used. The sampling theorem states that to reproduce the input signal without distortion, the sampling frequency must be greater than or equal to twice times the upper limit frequency of the input signal, but in practical work, to get better input signal waveforms in each cycle of the input signal must be data more than ten points. Draw the waveform in order to more accurately reflect the characteristics of the input signal.
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Circuit design of ultrasonic range finder with mic
no vote
Distance is a parameter that needs to be detected in different occasions and control, so ranging becomes a problem to be solved in data acquisition. Although there are many ways of ranging, such as laser ranging, microwave ranging, infrared ranging and ultrasonic ranging. However, ultrasonic ranging is a simple and feasible method. Although there are many kinds of ultrasonic ranging circuits, there are even special ultrasonic ranging integrated circuits. However, some circuits are complex and difficult in technology, some debugging is difficult, and some components are not easy to buy. The circuit introduced in this paper has the advantages of low cost, reliable performance and easy to buy components. By using the principle of distance measurement and combining with the data processing of single chip microcomputer, the measurement accuracy is improved, the circuit is easy to realize, no debugging is needed, and the work is stable and reliable
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