The DC motor uses a thyristor rectifier to rectify the alternating current into an adjustable direct current and introduces voltage negative feedback, current cut-off negative feedback, etc. (12) The input terminal has an electrostatic protection function (10) Common mode range extended to the negative power supply (9) Has the function of internal compensation (8) Each package contains four operational amplifiers (3) High gain frequency compensation calculation (2) Built-in phase correction circuit, few external components (1) Wide operating voltage range of single power supply or dual power supply single power supply 3V~32V, dual power supply ☑.5V~☑5V Figure 2 shows the pin layout of LM324, and Table 1 shows the main parameters of LM324. It has 5 lead pins, among which "+" and "-" are two signal input terminals, and "V+" and "V-" are positive and negative power terminals. ![]() The LM324 circuit symbol is shown in Figure 1. It's input voltage can be as low as ground potential, and the output voltage range is 0~VCC. ![]() ![]() There are 4 operational amplifiers inside LM324, it has phase compensation circuit, working voltage range is wide, it can work with positive power supply 3~30 V, or positive and negative dual power supply ☑.5~☑5 V. ![]() LM324 Integrated Operational Amplifier 2.1 LM324 Pin Functions Principles of DC Speed Regulation System Circuit By calculating and analyzing the working principle of these unit circuits, their roles in the system and the key point voltages, the core role of the LM324 integrated four-ops in the regulating circuit is explained. This article describes the application circuits of different functions formed by LM324 in the regulation circuit of the DC speed regulation system: zero blockade circuit, given integrator circuit, adder and limiter circuit. The LM324 integrated quad operational amplifier has the characteristics of wide power supply voltage range and low static power consumption, so it is widely used in various circuits.
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