Reverse a handwheel, and it turns slightly before the mechanism starts moving in the opposite direction.

This lost motion during reversal can result from backlash. Gears are only one possible source.

⚙️ Gear meshes: Clearance between gear teeth must be taken up when the direction reverses.

🔩 Lead screws: Axial clearance in the lead screw assembly can produce a similar effect.

🔧 Connections: Clearance at mechanical interfaces can add to the total lost motion.

Before changing components, check where the relative movement occurs. Several small clearances can accumulate along the transmission.

For conventional gear pairs, some backlash is intentional. The appropriate amount depends on manufacturing variation, lubrication requirements, and thermal expansion.

💬 Where have you encountered the most noticeable backlash: gears, lead screws, or connections?

#MechanicalDesign# #Backlash# #Gears# #LeadScrew# #PowerTransmission#

You've probably seen this PCB layout guideline: place decoupling capacitors as close to the IC's power pins as possible.

But why does the distance matter?

When an IC draws a sudden burst of current, the decoupling capacitor helps supply that transient current locally. If the connection is too long, parasitic inductance can limit how quickly current flows, contributing to voltage fluctuations at the IC's power pins.

That's why placement isn't just about the distance between the capacitor and the power pin. The entire path matters — from the power pin through the capacitor and back to ground. Short connections, a small loop area, and a low-inductance ground connection all help improve decoupling performance.

In practice, a capacitor placed close to the IC isn't necessarily well placed if its ground connection takes a long route or adds unnecessary vias.

When routing a PCB, it's worth looking at the complete current loop, not just the distance between two components.

Curious how others approach decoupling capacitor placement in their layouts.

Hi makers!

This is a DC-DC module built around the well-known LM317 IC, it does not contain the diode bridge, so it cannot be used directly with a transformer. I also chose some usual connectors, you can tighten the wires with some screws and that's it.

This circuit is capable of reducing DC voltage, but keep in mind that the input voltage must be at least 3V higher than the output voltage. The LM317 circuit has various built-in protections, more details can be found at this link : https://www.ti.com/lit/ds/symlink/lm317.pdf .

There is enough space for an 11x36mm heat sink, because I can't know what parts each one has, I can't specify a specific model.

The supply of electronic circuits is made from sources of energy that must provide constant voltages. because In reality there are no ideal voltage sources, they are used voltage stabilization circuits. Initially they were made with discrete components (transistors and passive components), but after 1970 they also appeared the first linear integrated circuits with the role of stabilizing a voltage regulators, commonly called voltage regulators. There are currently two categories of stabilizers voltage: linear and switching. They are differentiated by the working of the active elements that contribute to stabilizing the output voltage. Thus the linear sources are characterized by an operation that avoids locked modes and saturated transistors with regulating role, while at switching sources - transistors or thyristors mains operate in switching mode at a frequency over 20kHz. The choice between linear and switching power supplies is it depends on the destination of the power supply realized, by the schemes in the vicinity and by the price of cost.

Integrated linear regulators were made in the versions in order to cover as many applications as possible, the possibility of adjusting the output voltage being one of the criteria the most important. Subsequently the typical voltages used at powering different families of analog integrated circuits or digital have also led to the emergence of the first regulators of fixed voltage with output voltages at values of 24V, 15V, 12V, 9V, 5V, of both polarities.

Before sending a PCB off for manufacturing, I prefer to experiment using either a breadboard or a test board. After that, an order is placed with JLCPCB.

Enjoy it! 🤓

This project is presented "as is" and is intended for personal use.

#PCB# #LM317#

Your CAD assembly shows no interference. But during assembly, a nearby panel blocks the hex key, or a socket fits over the nut with no room to operate the wrench.

The missing detail? Tool clearance.

📌 Before finalizing your design, check three things:

• Installation access: Can the screw and nut reach their positions along the actual assembly path?
• Tool access: Is there enough space around the fastener for a hex key, wrench, or socket?
• Working clearance: Once the tool is in place, can you turn it or reposition it to finish tightening?

💡 Assembly order matters, too.

Some fasteners need to be tightened before neighboring parts are installed. Also consider maintenance: will replacing one component require taking apart half the assembly?

Adding simplified tool models to your CAD assembly can help you spot access problems before parts are made.

Have you ever finished making all the parts, only to discover you couldn’t tighten the last screw? 👇

#MechanicalDesign# #DesignForAssembly# #Fasteners# #EngineeringTips#

A sheet metal part may have no geometric interference and a valid flat pattern—but that doesn’t guarantee it can be formed with the available press brake and tooling.

Three common limitations:

🔧 Tooling interference: On deep U-shaped parts or inward-facing flanges, previously formed sections may collide with the punch or machine during bending.

🔄 Bend sequence: An earlier bend may obstruct a later operation, making the part difficult to position, bend, or remove.

📏 Short flanges: In conventional V-die bending, a flange that is too short may not have enough support across the die opening for reliable forming.

Before releasing the design, check more than the finished shape: Can the tooling reach each bend? Is the bend sequence feasible? Can the finished part be removed?

Reviewing these points with your fabricator early can help reduce design revisions and rework.

💬 Have you encountered a part like this? Did you change the design—or the tooling and bending process?

#sheetmetal# #SheetMetalBending# #SheetMetalDesign# #dfm#

A USB-C power monitor? A tiny weather station? A programmable macro pad? Or a little robot that keeps you company while you work?

Small desk gadgets are great projects for experimenting with sensors, displays, microcontrollers, and custom PCBs.

Sometimes the best project is the one you build just because you can.

#DIYElectronics #DeskGadgets #EmbeddedSystems #MakerProjects

The power rail looks fine. The firmware compiles. But the hardware still doesn't behave as expected.

Maybe it's a wiring issue, a timing problem, or a small detail in the PCB layout.😅

Debugging isn't always the most exciting part of building electronics, but it's where a lot of learning happens.

What's a hardware bug that took you much longer to solve than expected?

#ElectronicsEngineering #HardwareDebugging #PCBDesign #Maker

Hi makers!

I managed to assemble one of my PCBs, the red one, I will use it as a thermal protection circuit to cool down the hot components like e.g. mosfet transistor from a power supply or audio amplifier.

You can find complete details about the project here: https://jlchub.com/posts/41608?from=send