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I made a binary seven-segment wristwatch. Each segment represents a binary multiplier: segment B is 1, C is 2, D is 4, and so on. Project info submitted by /u/olxu [link] [comments]

Yep, I’ve used 1970’s to 1980’s era parts from Japan and Taiwan only. The whole thing is built around a mitsubishi jungle IC. The controller is external though. I have no way of testing it because analog TV was shut down a long time ago here in Czech Republic. Just built it out of love and compassion for RF circuits. Fun fact: I’ve spent 6 hours just soldering all the components into their respective holes. There isn’t a single hole unused on that perfboard. submitted by /u/A55H0L3_WindowsXP [link] [comments]

Hey everyone! I’d like to share a fun and useful project I recently built: a PI-controlled soldering iron system based on a Hakko handle, designed specifically for heat insert pressing into 3D prints. You can enjoy this project from a few different angles: A DIY Tool That Actually Works I originally bought a so-called "digital soldering iron" to make a heat press, but it turned out to be fake—it just used open-loop power control with a 7-segment display. No temperature sensor, no feedback, no reliability. So I decided to build my own closed-loop system using proper RTD feedback, MOSFET switching, and a real PI controller running on an STM32. Now it gives stable heat control, perfect for insert work. A Showcase for My Snapboard Platform This project is also a working demo of Snapboard, my modular prototyping platform for embedded hardware. It’s like a LEGO base for breakout boards—strong and swappable, yet reusable across multiple projects. The potentiometer, OLED display, and power modules all snap into place cleanly with perfboard support. It’s been rock solid for building functional prototypes. A Control-Theory Driven Design Instead of trial-and-error tuning or just using bang-bang control like most DIY temp controllers, I took a full control engineering approach: Collected step response data Fitted it to a first-order model Designed the PI gains using pole placement, not guesswork Analyzed performance metrics like settling time, overshoot, etc. You can get a ready-to-go PI controller without hand-tuning. I even wrote a short doc on the theory and design [Notion link here]. What You See: OLED display shows SP, PV, and OP Potentiometer sets the temperature Serial data logging for step response capture Clean 12 V/24 V DC input with a switching regulator RTD temperature sensing and MOSFET power control submitted by /u/menginventor [link] [comments]

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Credit goes to @i509VCB on the KiCAD Discord submitted by /u/cyao12 [link] [comments]

Images floating around. Heard this is unconfirmed. submitted by /u/RineMetal [link] [comments]

The family brings 18-channel monitoring and SPI-to-TPL bridge to electric vehicle and energy storage applications.

Hello everyone This is my first PCB design from scratch, made in KiCad 9.0 It will serve as a mainboard for my bluetooth remote controlled car Based around an Arduino Nano, it handles Driving motors (with L293D IC) An ultrasonic sensor A servo Rear status LEDs such as REVerse, BRaKe, Left turn signal, Right turn signal (like seen on real cars) Blinking the LEDs (with a 555 IC in the monostable configuration and a 74HC00 AND gate IC) An HC-05 Audio (a horn and an alarm (triggered by the ultrasonic sensor after a certain distance)) It is a 4-layered PCB with In1.Cu being a power plane for +5V, and B.Cu being a power plane for GND, F.Cu and In2.Cu being signal layers Has 4 2.00mm corner mounting holes Here are the KiCad project files in my GitHub repo' if anyone would like to take a closer look: https://github.com/darsh-agrawal71/bt-rc-car-pcb-kicad-prj Image #1: PCB screenshot (Red trace = F.Cu, Orange trace = In2.Cu) Image #2: Schematic Image #3: 3D View screenshot submitted by /u/Practical-Friend-960 [link] [comments]

Micron’s 256-Gb radiation-tolerant SLC NAND meets tight aerospace reliability benchmarks.

MACOM Technology Solutions Inc of Lowell, MA, USA (which designs and makes RF, microwave, analog and mixed-signal and optical semiconductor technologies) has assumed full operational control of the wafer fabrication facility in Research Triangle Park, NC, that it purchased from Wolfspeed Inc of Durham, NC, USA in December 2023...

Luminus Devices Inc of Sunnyvale, CA, USA — which designs and makes LEDs and solid-state technology (SST) light sources for illumination markets — has added to its MP-5050 Series of high-power LEDs with the new MP-5050-240P and MP-5050-810P models, which deliver what is claimed to be industry-leading efficiency and reliability, designed specifically for demanding outdoor and commercial lighting applications...

I've always thought that electronics where expensive and hard but after investing some time learning the basics I made this lil 555 timer PCB and I know there are some things that could be better but I'm really proud of my work submitted by /u/Inside-Ad8295 [link] [comments]

There have been numerous circuits published in EDN as design ideas (DI) for the past few months, centering around the “Flip ON Flop OFF” circuit originally published by Stephen Woodward. These are all designed for DC voltages less than 15 V, since this is the maximum power supply voltage of the CMOS ICs that were used in their design.

Wow the engineering world with your unique design: Design Ideas Submission Guide

There are several applications that use 48 VDC as the supply voltage, such as telecom equipment, solar panel controllers, and EV controllers. In general, DC on/off switches are bulky, as there is no current zero-breaking concept as in the case of AC circuits. A DC on/off switch will break the full load current, leading to arcing and contact erosion. Because of this, bulk-sized switches with higher current capacity are employed.

Figure 1’s circuit can flip on and flop off 48 VDC with a tiny push button. D1 is a 5.6-V Zener diode. It is connected to the base of the Q2 transistor. Its emitter voltage becomes around 5 VDC (Vz-Vbe).

ICs U1 and U2 operate with this 5 VDC voltage. When the pushbutton (PB) is pushed once momentarily, a small pulse is generated, which is counted by U1. Its LSB pin becomes HIGH, which is applied to the gate of Q1. Hence, it conducts, and the output gets 48 VDC. For the next push of PB, the LSB pin of U1 goes LOW, and the gate of Q1 becomes LOW, and Q1 stops conducting. This makes the output voltage go to zero. This action repeats for every push.

Figure 1 The flip on, flop off circuit for 48 V. The output gets 48V DC when you push PB once momentarily. For the next push, output becomes 0 V. U1 and U2 operate at 5VDC only. Connect the Vcc pins of U1 and U2 to VDD and the ground pins to VSS, as shown in the above circuit. Use heat sink for Q1 for higher currents.

Since PB encounters current around a milliamp, the low current, sleek PB is sufficient to switch ON or OFF the 48-V supply with high current. With a proper heatsink on Q1, this circuit can switch ON or OFF DC currents up to several amps as per the data sheet of Q1.

Both R1 and C1 are for PB switch debounce. Both R2 and C2 are for the power-on reset of U1.

If galvanic isolation is needed (this may not always be the case), you may connect an ON/OFF switch prior to the input. In this topology, on-load switching is taken care of by the PB-operated circuit, and the ON/OFF switch switches zero current only, so it does not need to be bulky. You can select a switch that passes the required load current. While switching ON, first close the ON/OFF switch and then operate PB to connect. While switching OFF, first push PB to disconnect and operate the ON/OFF switch.

Jayapal Ramalingam has over three decades of experience in designing electronics systems for power & process industries and is presently a freelance automation consultant.

Related Content

• Flip ON flop OFF
• Latching D-type CMOS power switch: A “Flip ON Flop OFF” alternative
• Flip ON flop OFF without a flip/flop
• Another simple flip ON flop OFF circuit
• Elaborations of yet another Flip-On Flop-Off circuit

The post Flip ON Flop OFF for 48-VDC systems appeared first on EDN.

The Keysight N9048B PXE EMI test receiver, paired with a standalone stream processing unit (SPU), delivers real-time, gapless 1-GHz time domain scan (TDS) bandwidth. With the SPU upgrade, the receiver covers 30 MHz to 1 GHz in a single step—down from three in the previous version—tripling EMI test speed. Together, the units enable faster, more accurate EMI testing.

With 1-GHz FFT bandwidth, the system accelerates EMI scans by covering the CISPR C and D bands in a single pass and supports user-selectable resolution bandwidths of 9 kHz, 120 kHz, and 1 MHz. Real-time, gapless capture ensures no transient events are missed, while high sensitivity and wide dynamic range reveal signals close to the noise floor.

The test setup shortens troubleshooting time from hours to minutes and fully complies with CISPR 16-1-1:2019 requirements. Additionally, the standalone SPU provides a path for future upgrades, offering long-term flexibility.

The Keysight N9048B PXE EMI receiver will be showcased at Techno-Frontier 2025 in Tokyo at the TOYO booth. Learn more about the N9048BSPU stream processing unit by viewing the flyer here.

N9048B PXE product page

Keysight Technologies 

The post 1-GHz TDS upgrade triples EMI test speed appeared first on EDN.

Quectel’s KCMA32S Zigbee/BLE module combines a compact design with versatile connectivity for a wide range of IoT devices. It is built on Silicon Labs’ ultra-low-power EFR32MG21 wireless SoC, which integrates an Arm Cortex-M33 processor running at up to 80 MHz and supports Zigbee 3.0 and BLE 5.3 for concurrent protocol operation.

The KCMA32S enables mesh networking over Zigbee and BLE, supporting scalable, many-to-many communication for smart lighting, building automation, and home networks. An optional Secure Vault feature adds advanced security, while flexible memory configurations—up to 96 KB of SRAM and 1024 KB of flash—offer ample headroom for application development.

With its small-scale 20×12×2.2-mm LCC+LGA form factor, the KCMA32S helps reduce both size and cost in end products. It offers up to 20 GPIOs, multiplexable via the QuecOpen SDK for interfaces such as I²C, UART, SPI, and I²S. The module delivers a receive sensitivity of –104 dBm and transmit power up to +20 dBm, with optional PCB antenna, RF coaxial connector, or pin antenna interfaces.

A timeline for availability of the KCMA32S Zigbee/BLE module was not provided at the time of this announcement.

KCMA32S product page

Quectel Wireless Solutions 

The post Zigbee/BLE module enables scalable IoT networking appeared first on EDN.

Sequans’ Iris SQN9506 wideband RF transceiver covers 220 MHz to 7.125 GHz with up to 200 MHz of instantaneous bandwidth. Designed for software-defined radio (SDR) in defense, aerospace, drones, V2X, routers, and other 5G systems, it provides 20 receive and 4 transmit paths, supporting up to 4×4 MIMO in both Tx and Rx modes.

The SQN9506’s integrated RF architecture includes 10 RF synthesizers for concurrent scanning and observation. Unlimited frequency hopping with fast switching enables robust anti-jamming performance, allowing real-time hopping across channels during transmission and reception. The transceiver also supports digital interfaces such as DigRFv4 and JESD204C for both data and control.

Easily integrated with any FPGA processor, the single-die device offers low power consumption—drawing just 0.2 mA in sleep mode, 3 mA in standby, and 8 mA when idle. It is housed in a 178-pin BGA package with dimensions of 8.4×4.8×1 mm.

A timeline for availability of the Iris SQN9506 RF transceiver was not provided at the time of this announcement.

Iris SQN9506 product page 

Sequans Communications 

The post RF transceiver enables wideband SDR systems appeared first on EDN.

Two diode controllers, the AP74502Q and AP74502HQ from Diodes, provide 80-V reverse battery polarity protection for automotive systems. They also offer load disconnect to guard against overvoltage and undervoltage conditions. Compatible with 12-V, 24-V, and emerging 48-V battery systems—including those in hybrid and electric vehicles—the devices are well-suited for ADAS, body control modules, infotainment, and exterior lighting.

The AEC-Q100 qualified controllers differ in peak gate source current. The AP74502Q handles 60 µA (typical), enabling smooth startup with inherent inrush current control—useful in applications where limiting surge current is critical. By comparison, the AP74502HQ withstands a higher 11-mA peak, allowing quicker MOSFET turn-on with a 1-µs typical response.

Both controllers support input voltages as low as 3.2 V for reliable operation during cold crank conditions and provide a peak gate turn-off sink current of 2.3 A for fast MOSFET switching during voltage events. With the charge pump enabled, their quiescent current is 62 µA, dropping to 1 µA when disabled, minimizing power consumption and battery drain.

Housed in SOT28 packages, the AP74502Q and AP74502HQ cost $0.27 each in 1000-unit quantities.

AP74502Q product page   

AP74502HQ product page  

Diodes

The post ICs guard automotive systems from reverse power appeared first on EDN.

Raising the bar for enterprise NVMe SSDs, Kioxia’s LC9 drive delivers 245.76 TB in both U.2 (2.5-inch) and E3.L form factors. It joins the previously announced 122.88-TB model in the U.2 (2.5-inch) and E3.S form factors, expanding the LC9 series to meet the performance and efficiency demands of generative AI—while helping replace multiple power-hungry HDDs.

LC9 drives feature a PCIe 5.0 interface, offering up to 128 GT/s via a Gen5 single x4 or dual x2 configuration. They are compliant with NVMe 2.0 and NVMe-MI 1.2c specifications and meet many of the requirements in the Open Compute Project (OCP) Datacenter NVMe SSD specification v2.5.

These high-capacity SSDs integrate multiple 8-TB devices, each built from 32 stacked dies of 2-Tb BiCS8 3D QLC NAND in a compact 154-ball package. The drives also incorporate a controller and firmware, along with features such as die failure recovery, parity protection, and power loss protection. Dual-port operation enables high availability, and data security options include SIE, SED, and planned FIPS 140-3 compliance.

The LC9 series of SSDs is now sampling to select customers.

Kioxia

The post Kioxia adds 245-TB SSD to enterprise lineup appeared first on EDN.

Couple of years ago I designed the STM32 Nucleo F303 based control boxes, for students to learn C coding on. Multiple of my designs replaced very old, outdated designs, originally made in 2001-2002. I was looking for the ways to improve it, and also, my colleague is not that willing to learn of its assembly, so I looked how to simplify it and came up with custom shield PCB for Nucleo, routing around the pins I will need only. Once fully assembled I think it will look better than current version. submitted by /u/Peekabrrrrrr34 [link] [comments]

Choosing the right mouse can truly transform one’s working, gaming, or creative process. Be it accurate gaming or simple productivity, a dependable mouse increases lure editing speed, comfort, and efficiency. Here is a detailed look at the top ten mouse brands in the U.S, including their salient features, flagship models, and unique technology.

1. Logitech

Logitech, headquartered in Newark, California, can probably be considered the industry leader in both productivity and gaming mice. The company focuses on ergonomic office designs and high-performance gaming equipment. Popularly, the MX Master 3S is used by professionals, while gamers prefer the ultra-light G Pro X Superlight. Technologies present in Logitech include the HERO sensor, the Logi Bolt wireless connection, and the MagSpeed scroll wheel, all of which ensure pinpoint accuracy and speed, with an easy transition from work to play.

2. Razer

Razer is a household name among the laymen in the games. The company has set up shop in designing outright high-DPI, ultra-responsive competitive gaming mice for esports and competitive use. With features like Focus Pro 30K Optical Sensor and HyperSpeed Wireless technology, popular models like the DeathAdder V3 Pro and Basilisk V3 provide professional-level gaming with lightning-fast performance and haptic accuracy.

3. Corsair

Located in Fremont, California, Corsair is the very first company in this space to manufacture gaming mice that combine pure performance with extreme levels of customization. Its best-sellers include the Dark Core RGB Pro and M65 RGB Ultra, both incorporating Slipstream Wireless technology and optical switches. Corsair also provides its customers with the iCUE software with which they can alter DPI, lighting, and macros for a truly immersive gaming experience.

4. SteelSeries

SteelSeries has set up shop in Chicago, Illinois, to make its mark in the e-sports and competitive gaming world. The company usually designs the ultralight and fast mice such as the Aerox 3 Wireless and Rival 5 that feature TrueMove sensor technology and Quantum 2.0 Wireless, respectively. These provide near-zero latency and waterproof designs for situations in which games are being played at breakneck speeds.

5. HP

Based in Palo Alto, California, HP produces a vast stock of budget-class, workhorse-type mice. These are great for productivity and basic office work. Popular models, such as the HP 930 Creator Wireless Mouse and HP X3000, feature multi-device Bluetooth connectivity and silent click design, making them well-suited for every day use and professional environments.

6. Microsoft

Based out of Redmond in Washington, Microsoft concentrates on business-grade and ergonomic mice running seamlessly in the Windows ecosystem. The company’s best models such as the Microsoft Arc Mouse and Surface Precision Mouse work best with their BlueTrack sensor and for a hassle-free working experience with Surface devices and Windows-based PCs.

7. Glorious

Born and raised in Dallas, Texas, Glorious is the new rising star in high-performance gaming mice. Famous for their ultra-light honeycomb designs, the brand offers the best models on the market like the Model O and Model D Wireless. Powered with the BAMF sensor and Ascended Cord to reduce drag and maximize responsiveness, they are favorites among FPS gamers.

8. ASUS ROG

Located in Fremont, California, the ROG division of ASUS will offer you high-end gaming mice where style meets its cutting-edge hardware. ROG AimPoint sensor powers several recognized ROG models, like the ROG Gladius III and Chakram X, with push-fit switch sockets to enable customizable click resistance, thus appealing to gamers who demand precision and flexibility.

9. Cooler Master

Cooler Master, based up in Chino, California, makes gaming and everyday-use mice with a focus on price-to-performance ratio. Bestsellers like the MM731 and MM720 are equipped with Ultraweave cables, PTFE feet, and RGB lighting customizable to gamers who like the idea of having something lightweight and really nice-looking for a reasonable price.

10. Dell

Dell, headquartered in Round Rock, Texas, makes reasonably durable and efficient mice for office use and home use. Because these mice, including the Dell MS7421W and Dell WM126, are known for their long battery life, multi-OS support, and plug-and-play experience, these are the ideal companions of any business amateur as well as students.

Brand Comparison:

Brand	Use Case	Key Model	Sensor Type	DPI Range	Connectivity
Logitech	Productivity & Gaming	MX Master 3S / G Pro X	HERO Sensor	Up to 25,600	Wireless/Bluetooth
Razer	Esports Gaming	DeathAdder V3 Pro	Focus Pro 30K	Up to 30,000	HyperSpeed Wireless
Corsair	Custom Gaming	M65 RGB Ultra	PixArt PAW3393	Up to 26,000	Wireless
SteelSeries	Competitive FPS	Aerox 3 Wireless	TrueMove Core	Up to 18,000	Wireless/USB-C
HP	General Office	HP 930 Creator	Optical Sensor	Up to 4,000	Bluetooth/USB
Microsoft	Business Use	Surface Precision	BlueTrack	Up to 3,200	Bluetooth/USB
Glorious	Lightweight Gaming	Model O Wireless	BAMF Sensor	Up to 19,000	Wireless/USB-C
ASUS ROG	High-End Gaming	Chakram X	ROG AimPoint	Up to 36,000	Wireless/USB
Cooler Master	Budget Gaming	MM731	PixArt PAW3370	Up to 19,000	Wireless/USB
Dell	Office Use	MS7421W	Optical Sensor	Up to 3,000	Wireless

Conclusion:

The top 10 mouse brands that U.S. can provide comprises a diverse selection for every need, be it gaming, office, or hybrid. Brands like Logitech and Razer are in the forefront with innovative, feature-laden models, while the likes of HP, Microsoft, and Dell provide tried and tested solutions for productivity.

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