In some areas of industrial control, because the scene is very complex, very high between the various nodes in common-mode voltage. Although the RS-485 interface uses a differential transmission, with a walk against common mode interference, but the common mode voltage exceeds the RS-485 receiver to receive the voltage limit, that is less than +12 V or-7V, the the receiver will no longer work, eve...

When the input signal is zero, due to a power disturbance, it comes with a frequency signal fo, which makes the amount of feedback frequency signal generated 180 leads or lags. Phase shift, making the net input is equal to the amount of input plus feedback, allowing the feedback signal (input signal) with each other to maintain the output signal, a phenomenon known as oscillation. three negative...

Each time a byte is received or sent, CPU will receive an interrupt from the serial device. The CPU then put the received byte from the UARTs buffer memory to move somewhere, or a byte to the UART transmission. 8250 and 64 datasheet and 16450 UART is only a byte buffer. This means that every byte sent or received will interrupt CPU - times, so in the case of low speed no problem. But in the high-speed transfer rat...

A / D converter for analog is very sensitive to small noise. (1) integration capacitor shield grounding. As the A / D converter in the integrator time constant by the constraints, the impedance of the capacitor can not be too low. Therefore shielding measures must be taken, after a single use foil to wrap the earth. (2) plus bypassed. Power supply and 63 datasheet and bypassed the interference common to put me...

Quasi-resonant flyback converter (Flyback Converter) because it can achieve zero-voltage, reducing switching losses, reduced EMI noise. Figure 24-36 is a quasi-resonant flyback converter schematic. One, Lp is the primary winding inductance, L site for the primary winding leakage inductance, RP is the resistance of the primary winding, CP is the resonant capacitor. seen from the diagram, quasi...

Environment there is room for all kinds of stray electromagnetic fields, with a pair of electrodes in the organisms collected on the weak biological signal containing the far-field for a variety of high-frequency differential-mode interference, and 64 datasheet and is a significant near-field generated electricity 50 Hz common mode interference submerged. Figure 15-27 shows, Cl, C2 is set up in the human ECG conta...

This article describes several single-supply dual power supply circuit converts the example of electronic enthusiasts solve problems. Circuit shown in Figure 24-34. Figure 24-34 (a) is the most simple converter circuit. The disadvantage is that Ri, R2-hour choice of resistance, the circuit itself consumes large power: resistance is large with a load capacity and 60 datasheet and weak. Practicality of this circui...

Power capacitor decoding scheme has the following three: (1) the absolute value of the output voltage has nothing to do with the capacitor, the capacitor as long as the relative proportion of accurate, able to ensure the D / A accuracy, which as for the MOS Ju circuit, as long as strict control of chip size ratio of the capacitor can do, so it is not difficult. (2) the accuracy of the output v...

In the past 20 years, personal computer peripherals have been relatively simple, often used in the mouse, printer. Although the personal computer in the computing performance and 69 datasheet and enhance the many application areas, and 69 price and serial and 69 suppliers and parallel port, but over the years invariably located behind the main chassis, the function and structure does not change. serial appeared in 1980 or so, the data transf...

(1) intrinsically safe barrier used in intrinsically safe system design, it is installed in a safe place and LT1236CIS8-5 datasheet and safe circuit with the non-intrinsically safe circuits and LT1236CIS8-5 price and devices, through the current limiting circuit and LT1236CIS8-5 suppliers and voltage limiter circuit limits taken on-site energy of intrinsically safe circuits, thus preventing the risk of non-intrinsically safe power circuit intrinsically safe circuits in ser...