#ElectricalEngineering#

Using XL = 2 pi f L
And then I = V / XL

current was calculated at 16.1 mA

Easy EDA is giving 0.021A. Why?

Hi, i requested the part C54777963 to be added via

https://easyeda.com/page/apply-new-part

almost a week ago but it has still not been added > i can't place it ("Request new part") instead of "Place".

I was wondering how long this is supposed to take, the claimed 3 working days are already over.

Is there another way of placing a part which says "Request new part" instead of "Place"?

I'm experiencing an issue with text clipping at end of labels introduced in 6.5.61, reproducible with Coolvetica font at heights below 1.9mm, works fine in 6.5.51.

I noticied this started happening during the summer on the web cilent version so switching to the standalone client fixed the issue, i guess that was using a different version of the text rendering engine. Now the standalone client recently upgraded to version 6.5.61 i am having the same issue again. i have tried to modify the font without success.

When selecting a mechanical gripper, first choose the opening-and-closing motion, then the contact structure. Parallel and centric describe how the fingers move; flexible describes how they deform to follow a contour. These features can be combined, with selection based on workpiece shape, positioning requirements and handling loads.

⚙️ How do parallel, centric and angular grippers differ?

A two-finger parallel gripper moves its fingers toward each other along straight paths, allowing gripping from opposite sides. Flat surfaces, V-grooves or custom finger profiles can accommodate both rectangular and round parts. Suitability depends on the finger contact design.

A three-finger centric gripper closes its fingers synchronously toward a common center, making it suitable for centering round or cylindrical workpieces. An angular gripper opens and closes by pivoting its fingers, which can provide clearance during approach and release. However, the gripping location changes with the finger angle.

🤏 How do you choose between rigid fingers, soft pads and flexible fingers?

Rigid fingers establish contact through defined gripping surfaces, allowing locating features to be designed around the workpiece. They suit tasks with consistent part geometry and clearly defined placement orientations.

Adding soft pads to rigid fingers provides cushioning through local compression and changes the frictional properties of the contact surface. Their effect depends on the material, thickness and surface condition.

Flexible fingers deform to follow a contour, making them suitable for objects with shape variations that require gentle contact. In a Fin Ray finger, flexible side bands and internal ribs deform together to accommodate the contour at the contact region.

🔧 Can a parallel gripper use flexible fingers?

Yes. The parallel mechanism transmits and guides motion, while the flexible fingers adapt to the contour after contact. “Parallel” and “flexible” can therefore describe the same gripper, serving different motion and contact functions.

Final selection also needs to account for workpiece mass, motion acceleration, finger length and allowable contact force. The opening determines whether the workpiece fits; the contact structure affects how it is held; and the positioning requirements determine whether more clearly defined geometric constraints are needed.

#GripperSelection# #ParallelGripper# #CentricGripper# #FlexibleGripper# #MechanicalDesign#

Bead blasting is a mechanical surface treatment that uses fine glass beads propelled at high speed to create a consistent, non-reflective surface texture.

Why choose bead blasting for CNC machined parts?

• Uniform Appearance: Helps create a consistent matte finish across the surface.
• Reduced Reflectivity: Minimizes unwanted glare and surface reflections.
• Surface Preparation: Can be used before anodizing to achieve a more uniform final appearance.
• Aesthetic Enhancement: Gives aluminum components a clean, refined look.

The process is particularly suitable for aluminum housings, enclosures, and precision components where surface consistency matters.

Have you used bead blasting on your CNC parts?

#CNCMachining# #BeadBlasting# #SurfaceFinishing# #AluminumParts# #Manufacturing# #Engineering#

Hi makers!

I would like to show you an expansion board, it is designed to be compatible with ESP32 boards. It is an expansion board with the help of which an ESP32-WROOM-32 module can be more easily connected, for example to a breadboard, sensors, others or to jumper wires. Through this board, a simple way of using the ESP32 has been reached and thanks to the 2.54mm pins headers, you can leave the ESP32 on this expansion board and mount it like that in a case, for example, because you have screw holes available.

The main supply voltage is 7-9V through the barrel jack. Through this voltage source, both the ESP32 board is powered, but other components or modules can also be powered because there are pins from the rail on the expansion board directly connected to this main source. The module also contains a jumper switch on the power supply (you can replace it with a simple strap if you don't need it) and LED indicator for its presence. There are also two rails for GPIO, two rails for GND, two rails for 3V3 and 3 for 5V. I tried to signal the presence of rails on the silkscreen board. You can mount female or male headers, it's your choice.

Attention! Locate the power supply pins properly and remember that the voltage regulators of 5V and 3.3V (ESP32 onboard) are SMD, they are not of high power and cannot supply a whole mass of circuits.

Check the electronic diagram before anything else.

And also 3D views:

I just designed the PCB for my own use. This project is presented ""as is"" and is intended for personal use.

#PCB #ESP32

Hi makers!

I would like to show you a circuit, 10-LED battery charge level indicator centered around the LM3914 (U1) linear display driver integrated circuit. It provides a visual representation of a battery's voltage using an LED bar graph.

Here is a detailed breakdown of how each section of the circuit functions:

1. Power Supply & Switching

• J1 (Battery Input): This header connects the battery to the circuit. Pin 1 is the positive terminal (VCC), and Pin 2 is the negative/ground terminal (GND).
• J3 (On/Off Switch): A single-pole, double-throw (SPDT) switch configuration. When closed (shorting pins 2 and 3), it delivers power from the battery to the main (VCC) rail of the circuit, which powers the LM3914 (Pin 3) and supplies the common anodes of the LED display.

1. Voltage Reference & Scaling (Calibration)

The LM3914 uses an internal 1.25V reference to establish the upper and lower thresholds of its internal resistor ladder:

• High Reference (V_RHi): Pin 7 (Out) and Pin 6 (Rhi) are tied together, setting the top of the measurement scale to the chip's internal 1.25V reference. Pin 8 (ADj) is tied to ground, keeping this reference stable against the ground rail.
• Low Reference (V_RLo): Pin 4 (Rlo) determines the voltage level at which the lowest LED (first indicator) turns on. It is connected to potentiometer RV1 (5K), which allows the user to adjust and calibrate the exact "low battery" threshold.

1. Input Signal Sensing

• Pin 5 (Sig): This is the analog input pin that samples the voltage to be measured.

• RV2 (50K) & R1 (3K):

  Because a battery’s voltage is typically much higher than the chip's internal 1.25V reference limit, RV2 and R1 form an adjustable voltage divider. This network scales down the full battery voltage so that it falls precisely within the V_RLO to V_RHI window. RV2 is adjusted during calibration to map the "full battery" voltage to the highest LED.

1. Display & Mode Selection

• BAR1 (HDSP-4830_2): A 10-segment LED bar graph display. The LM3914 features internal constant-current sinks on its output pins (Pins 1 and 10–18), meaning no current-limiting resistors are required in series with individual LEDs.
• J2 (Selector / Mode Switch): Controls how the LEDs display the information:
  • Bar Mode: When a jumper connects pins 2 and 3, Pin 9 (Mode) is tied to (VCC). In this mode, the display fills up like a solid bar (e.g., at 50% charge, LEDs 1 through 5 light up).
  • Dot Mode: When J2 is left open, Pin 9 is disconnected. In this mode, only a single LED lights up to represent the current voltage level, which significantly reduces power consumption.

This circuit description was created using AI tool.

Now, let me show you another interesting aspect: I built a circuit like this at home. It took quite a bit of work—I even made a double-layer PCB. Was it worth it? Well, for the time being, yes.

I just designed the PCB for my own use, I am not the original author. This project is presented ""as is"" and is intended for personal use.

Before sending a PCB off for manufacturing, I prefer to experiment using either a breadboard or a test board. In this case, however, experimenting on a breadboard is easy. After that, an order could be placed with JLCPCB.

#PCB #LM3914 #LM3915

Sometimes, the machining itself is the finish.

@tenpapa1988 chose Raw aluminum for his Bakeneko-60 case, keeping the characteristic surface of the CNC-machined part visible.

No additional finish — just the material and machining details doing the work. ⚙️

For CNC-machined aluminum parts, would you prefer a Raw surface or a finished look?

#CNCmachining# #CNC# #Manufacturing#

Creative electronics meet custom sheet metal fabrication. ⚙️

@Mjm_12f designed Anthracite, a fuzz pedal that combines classic fuzz tones with adjustable input impedance, variable bias, and MIDI control.

Its sheet metal enclosure highlights how custom metal components can support electronic product design, providing a functional housing for carefully arranged hardware.

A great example of engineering details coming together in a distinctive product.

#SheetMetalFabrication# #ElectronicsDesign# #Manufacturing# #Engineering#

A sheet metal part can look correct in CAD and still cause problems during assembly.

One common reason? Ambiguous engineering drawings.

For bent sheet metal parts, clearly define critical dimensions, tolerances, and datum references—especially for hole positions and features that must align after forming.

Not every dimension needs a tight tolerance. Focus on the features that affect fit, function, and assembly.

A clear drawing reduces manufacturing ambiguity and helps ensure the finished part meets design intent.

#SheetMetalDesign# #DesignForManufacturing# #GDandT# #MechanicalEngineering# #Manufacturing#