## Archive

• ### What determines frequency of a crystal oscillator?

We only know that crystal oscillator is a frequency component, and there may be very few people who divide crystal oscillator into a fundamental crystal oscillator and an overtone crystal oscillator. So, what is a fundamental freq...

2023-03-18Archive

View
• ### Hear how engineers talk about various "fantasies" about first power-up on PCB.

For a newly soldered board, after confirming board's circuit diagram is correct and checking it thoroughly before powering it up (mostly with a multimeter) - are you still worried about what awesome things are going to happen at m...

2023-03-18Archive

View

Input impedance Input resistance (input resistance) refers to equivalent circuit input resistance. Add a voltage source U to input terminal, measure current I at input terminal, then input resistance Rin will be U/I. You can think...

2023-03-18Archive

View
• ### Pay attention to PCB vias

Via vias are one of important components of multilayer printed circuit boards, and cost of drilling is usually between 30% and 40% of cost of manufacturing a printed circuit board. Simply put, every hole on a PCB can be called a v...

2023-03-18Archive

View
• ### Why is capacitance Y generally not more than 0.1uF?

Y Capacitor The Y capacitor is a kind of safety capacitor. In such cases, a safety capacitor is used: that is, after failure of capacitor, it will not cause an electric shock and will not endanger personal safety. This is because ...

2023-03-18Archive

View
• ### How many of these free and easy to use circuit design programs have you used?

Engineering software and online resources tend to be expensive, but can be very useful for professionals, students, and hobbyists. These resources are often needed when users are starting a project or just doing an engineering rev...

2023-03-18Archive

View
• ### Principal analysis of BUCK / BOOST circuit, a summary is also in place

Dollar Converter Also known as a buck converter, this is a single-tube non-isolated DC-DC converter whose output voltage is lower than input voltage. In figure, Q represents switching tube, and its control voltage is usually a...

2023-03-18Archive

View
• ### Why PCB design usually controls 50 ohm impedance

In PCB design process, we usually layer elements we want to design before wiring and calculate impedance based on thickness, base material, number of layers, and other information. After calculation, we can generally get following...

2023-03-18Archive

View
• ### Why is there no current limiting resistor in LED?

Introduction: When using LEDs, it is necessary to design a current limiting circuit (which can be a current limiting resistor or a DC circuit) in circuit to ensure that current flowing through LED does not exceed maximum operating...

2023-03-18Archive

View
• ### These 3 uses of capacitors cannot be understood

Capacitors are commonly used for following three purposes. Tantalum capacitors are also used for same purpose as capacitor type. Using Energy Storage Uses battery power. When load current increases due to a momentary power ou...

2023-03-18Archive

View