MC14528: CMOS Integrated Circuit Application

Crystal oscillator

Quartz Oscillator 3225 20M OSC

The MC14528 is a CMOS integrated circuit that can be used to create a monostable flip-flop. This means it can be triggered repeatedly and is ideal for applications like timing circuits, delay circuits, and multivibrator designs.

Figure 1 shows the pin diagram of the MC14528 integrated circuit:

The following figure presents the function table of the MC14528:

Here is the working principle diagram of the MC14528:

The next image demonstrates a timing control circuit using the MC14528 as the central component:

In the circuit shown in Figure 4, when switch SW1 is turned on, point a becomes high, which turns on transistor Trl. This activates the 2N2907A, sending a trigger signal to pin 5 of the MC14528. The VR1 resistor and the 1μF capacitor are connected to pin 2, forming a timing network. When this circuit is activated, a high-level signal is output from pin 6, which drives pin 11, and pin 7 also outputs a high level to turn on the BC547 transistor, lighting up LED1. Additionally, the 1kΩ resistor and 47μF capacitor connected to pin 14 form a delay circuit. Once the voltage at pin 14 reaches the trigger threshold, pin 10 outputs a high level, turning on the BC547 transistor again, which lights up LED2. The relay is used to control other external circuits or devices based on the timing sequence.