Electronics lesson: electronic parts, electronic components, electronic projects, circuit diagram and more
Consider the circuit, HC908QY4 is the heart of all. It uses a pin PTB0, PTB1 and PTB2 to control and display the text on the LCD. This leads to (shift regiter – serial to parallel converter) CD4094 that we will provide the data bus to LCD display.
In the CD4094 data are synchronized on the rising edge and the LCD display will take on the falling edge shows us that this signal can be shared.
Triac is an active component that is increasingly being used in the circuit today. The direct use of EDF sector allows to switch a large load from circuit much smaller. Component symbols in Figure 1 operates in four modes theoretically, also called quadrants, which can be summarized by the table in Figure 2. These four quadrants in fact dependent on the polarity of the anode A2 from A1 and the triac gate.
For all the circuits that are powered by DC voltage, should always be considered the correct polarity! Whether it is positive or negative pole, or the circuit will be damaged.
A diode for reverse polarity protection
Of course, there is a polarized connector system such as the hollow plug. For many small self-built circuits, voltage circuits for testing, often taken from the power supply. And because it can happen that you accidentally turn on the power supply with the wrong polarity on the circuit, which makes your project vain. Even when soldering hollow connectors can happen the same.
