![]() The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V. The L293 is designed to provide bidirectional drive currents of up to 1 A at voltages from 4.5 V to 36 V. The L293 and L293D devices are quadruple high current half-H drivers. If your motor matches these specifications, do not hesitate to use L293D. However, it can withstand a current up to 1200 mA in 100 microsecond and non-repetitive. This IC can set up motors with a voltage between 5V to 36V and a current of up to 600 mA. There are several reasons which make L293D the preferred driver to the users, such as, cheap price (compared to other drivers), proper shape and size, easy control, no need for protective circuit and diodes, no need for heat sinks and good resistance to temperature and high-speed variations. L293D is one of the most popular drivers in the market. So we need intermediate circuits to connect the controller to the motor, called drivers. But as you know, the output of microcontrollers are 5V and 200mA and can not spin the motor. Therefore, we must control motors using controllers (logic circuits or microcontrollers or PCs or computers). One method is to connect it directly to a battery, then it spins at its maximum speed in a particular direction, but in practice, we need to control the motors (on and off, speed control, direction control, and position control). Depending on the model, the manufacturing method, price, etc., their current is about 100 mA to 5A. It is important to note that the direction of the arrow in the transistor symbol indicates the direction of current flow through the transistor, and not the direction of the voltage drop across the transistor.Motors used in academic robots normally operate at 5, 6, 9, 12 or 24 volts. The PMOS symbol is similar to that of an NMOS, but with the arrow pointing in the opposite direction.The arrow in the symbol points from the source to the drain, indicating the direction of current flow through the transistor. The NMOS symbol consists of a triangle representing the drain, a rectangle representing the gate, and a line representing the source.The JFET-P symbol is similar to that of a JFET-N, but with the arrow pointing in the opposite direction.JFET-P (Junction Field-Effect Transistor - P-channel) symbol:. ![]()
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