PCB Global Design

02/09/2026

LM7805 Voltage Regulator: Max Input Voltage & Thermal Limits

how much input voltage the LM7805 IC can actually handle? 🔌 While its absolute maximum limit is 35V DC, feeding it too much voltage generates excessive heat! Watch to learn the ideal input range (7V–12V), dropout voltage rules, and why heat management is key to keeping your circuits running safely. 🔧⚡

​

27/08/2026

Happy rakshabandhan ❤️

24/08/2026

24/08/2026

Why PCB Pads Lift

Ever ruined a board because a copper pad peeled straight off the FR4? 🤦‍♂️
​Most people blame dwell time (leaving the iron on the pad too long), but pad lifting is often triggered by other critical factors:
​🔥 Excessive Iron Temperature: High heat degrades and vaporizes the resin adhesive holding the copper to the substrate.
🔌 Mechanical Stress: Pulling connectors, board flex, or rough handling literally rips the copper bond.
🏭 Fabrication Adhesion Defects: Poor copper-to-dielectric bonding or resin curing issues right from the fab house.
🌡️ Thermal Shock & Cycling: Repeated extreme heating and cooling expands and contracts materials at different rates, fatiguing the bond.
🔄 Repeated Rework: Multiple desoldering attempts exhaust the epoxy strength until it finally lets go.

​

20/08/2026

Why Blind Vias Matter in High-Density PCBs 👀

Through-hole vias pass through the entire PCB, wasting routing space and leaving unwanted via stubs. Blind vias connect only the layers you need—freeing space and improving high-speed signal integrity. ⚡️

17/08/2026

Stop Letting Screw Heads Ruin Your PCB Clearance!

When you use standard mounting holes, bulky screw heads sit directly on top of your board. This becomes a massive mechanical headache when you need to mount a flat heatsink, stack multiple boards, or fit everything into a tight enclosure.
​The DFM fix? Specify a Countersink or Counterbore hole! 🛠️

​🔹 Countersink: A V-shaped hole that lets a flat-head screw sit perfectly flush with the board.

🔹 Counterbore: A flat-bottomed hole that sinks a standard pan-head screw entirely below the surface.

​

15/08/2026

Happy Independence Day | India

❤️

12/08/2026

PCB Gold Fingers: Edge Bevel & Chamfer

why PCB gold fingers have specific cuts? It comes down to two completely different features: the Edge Bevel and the Corner Chamfer.

​🔪 The Edge Bevel: A sloped cut across the board's thickness. It creates a wedge so the board slides into slots smoothly without crushing the connector pins.

📐 The Corner Chamfer: A slice on the 2D outer corners of the board. This acts as a physical guide to align the card perfectly into hardware rails without snagging.

​

09/08/2026

Press-Fit Assembly: When Soldering Isn't the Best Option ⚡🔧

Why massive connectors on heavy-duty PCBs often aren't soldered? 🤔
​Soldering thick, copper-heavy boards requires intense heat, which can cause extreme thermal stress, warping, and even delamination. The solution? Press-Fit Assembly. 💡
​Instead of solder, this method uses specially designed compliant pins that flex and compress against the copper walls of the board, creating a highly reliable, gas-tight electrical connection. But it takes serious precision—from exact hole diameters to perfectly controlled insertion forces—to get it right without damaging the board.
​Watch the breakdown to see how it works! 👇