An eye diagram overlays repeated digital transitions to show voltage and timing margin at a selected measurement point. A wide, tall opening usually indicates a cleaner channel. Eye closure can
IPC J-STD-001 defines material, process, inspection, and acceptance requirements for soldered electrical and electronic assemblies. It helps OEMs, EMS providers, engineers, and quality teams specify how a PCBA will be
PCB solder mask materials are permanent polymer systems applied over copper to protect the board and control where solder can contact pads. Common options include liquid photoimageable solder mask, dry-film
Choose flying probe testing for prototypes, changing designs, and high-mix builds. Choose in-circuit testing (ICT) when the PCB and BOM are stable and recurring volume can justify a custom fixture.Make
Introduction As a first thought, one might think that the 0 Ohm resistor is unnecessary; after all, why would someone use a resistor with no resistance? This is one of
To read a resistor on a PCB, first identify the marking method. Through-hole resistors usually use color bands. SMD resistors usually use numbers, letters, or no visible marking.The marking can
An HDI PCB is a high-density interconnect printed circuit board. It uses finer traces, smaller vias, and denser routing than a standard board. Most designs use microvias, blind vias, buried
Choose a microcontroller when a product needs simple control, low power, lower cost, and fast firmware development. Choose an FPGA when the design needs parallel processing, deterministic timing, custom digital
VCC and VDD usually mean the positive power rail. VSS usually means the lower power reference. In many simple CMOS circuits, VSS connects to GND. Do not trust the label
A rigid flex PCB is a packaging and reliability choice, not only a smaller way to connect two boards. Use it when cables, connectors, vibration, folding, or a tight enclosure
Silkscreen PCB is the printed legend layer that helps people read a circuit board during assembly, testing, repair, and traceability work. It is not just decoration. A clear PCB legend
Resistor values affect current, voltage division, signal stability, heat, tolerance error, and long-term sourcing. A 10kΩ resistor may be a good GPIO pull-up, but the same value can be wrong
