#ElectronicsEngineering

Doreen XuDoreenXu
2026-03-05

⚡ When Static Electricity Meets Smart Logistics… Reliability Matters.
In today’s high-speed logistics environment, intelligent pick-up light bars are transforming how packages are located and retrieved. But behind every smooth pickup experience lies a hidden threat—Electrostatic Discharge (ESD).

medium.com/@yamy28508735/analy

🔗 𝗙𝗶𝗻𝗱 𝗼𝘂𝘁 𝗺𝗼𝗿𝗲:[en.leiditech.com]
𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝘂𝘀: sales16@leiditech.com

Søren Kjærsgaardoz1lqo@techhub.social
2026-02-22

Built a test setup for my PMT tube, allowing me to bias an LED at really low currents, hopefully catching single photons, or at least a very low count 🙂

Photo Multipliers are insane devices! 🤷🏼‍♂️🤯

This video is meant to explain the setup, stay tuned for my next video where I do actual measurements 🙂🙂

#stem #physics #electronicsengineering #testandmeasurement #quantum

Doreen XuDoreenXu
2026-02-19

Don’t let your protection circuit become a decorative component.

If your TVS isn’t placed right, specified right, and backed by proper system design, it’s not protection — it’s illusion.

Read the full deep dive and discover why real engineers design protection first, not last.
medium.com/@yamy28508735/dont-

🔗 𝗙𝗶𝗻𝗱 𝗼𝘂𝘁 𝗺𝗼𝗿𝗲:[en.leiditech.com]
𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝘂𝘀: sales16@leiditech.com

Søren Kjærsgaardoz1lqo@techhub.social
2026-01-24

For an upcoming experiment, I need to know how accurate my #Keithley 2400 is at nA outputs (God I absolutely love that box… 🥰), but I also wanted to see how well my 6.5digit GDM-9061 multimeter tagged along..

Enter the HP 3458A… 💪🏼😎

Connected them all in series and although the set point on the 2400 is a bit off from reality, it’s own current measurement is bang on. At 20nA 🤯😃 And the 9061 multimeter was in agreement as well, even at such low currents.

Ready for next step, stay tuned 😎😎

#electronics #testandmeasurement #rfengineer #electronicsengineering

Søren Kjærsgaardoz1lqo@techhub.social
2026-01-17

At the night of the legendary capacitor explosion we also hosted a BYOD Oscilloscope night, where ppl could bring their instruments and learn more about them, common pitfalls, how to do basic measurements, more advanced stuff, etc.

Surprisingly many electronics enthusiasts don’t have an oscilloscope, and even more surprising, many don’t really know how to use the instrument they have.

The evening opened many new doors to the participants - I think everyone were happy 😃

#hamradio #electronics #electronicsengineering #rfengineer #testandmeasurement

Oscilloscope theme night at OZ7SAC
Søren Kjærsgaardoz1lqo@techhub.social
2026-01-13

Suddenly a loud bang from the lab at the local #hamradio club ‼️ 💥🤯

Luckily nothing happened to the people in there, but I guess it’s safe to say that this vintage capacitor decided to quit its job 😂

Always wear safety glasses 🥽 when testing and troubleshooting #electronics, especially if it’s vintage gear where you have no knowledge of its state and health☝🏼

#electronicsengineering #vintageelectronics #vintagerepair

Terna Engineering Collageayeshayadav
2025-12-20

Thinking about a future in Electronics Engineering? ⚡📡
An Electronics Engineering course at Terna Engineering College opens doors to careers in core electronics, IT & software, embedded systems, IoT, automation, government sectors, and higher studies.





Explore the career prospects of an Electronics Engineering course at Terna Engineering College, Navi Mumbai. Discover jobs, higher studies, and future-ready opportunities.
WAGO PolskaWAGO_Polska
2025-12-12
Doreen XuDoreenXu
2025-12-09

Looking for ultra-low loss, high reliability, and compact design?
The MBR40H100CDM brings 40A performance, 450A surge capability, thin TO-263M packaging, and lower VF than Vishay—making it the perfect rectifier for high-density switching power supplies.

See why it’s becoming the new engineer favorite 👇
medium.com/@yamy28508735/ultra

🔗 𝗙𝗶𝗻𝗱 𝗼𝘂𝘁 𝗺𝗼𝗿𝗲:[en.leiditech.com]
𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝘂𝘀: sales16@leiditech.com

Søren Kjærsgaardoz1lqo@techhub.social
2025-11-27

I bought a #Hamamatsu H7828 photomultiplier module, a ‘photon counter’. They’re insanely sensitive 😳

Seller knows what they’re dealing with and sealed it nicely in aluminum tape.

I left the tape mounted and put it in a box to screen the ambient light in my lab (which was already dimmed), then powered it on. It shows a ‘dark count’, noise that produces a certain level of ‘background’ pulses. Then I opened the box, just a little. And it’s visible!! 😳😳

A few photons, not many, still makes it to the detector, despite the aluminum tape sealing, it’s insanely sensitive 🤯🤯

I need to find a way to count the pulses and do some statistics on it, stay tuned for future experiments 🤓

#electronicsengineering #engineer #physics #stem #photon #photoncounting

Photon counter moduleBackground noiseOpening the box a littleOutput pulse
Doreen XuDoreenXu
2025-11-26

Choosing the wrong ESD diode can silently destroy your high-speed signals—but the right ‘selection + layout’ strategy boosts protection by over 80%. ⚡
Learn the pro-level tips engineers use to keep USB, HDMI, and industrial interfaces safe.

👉Want to know more? Click here👉
medium.com/.../temperature-con...

medium.com/@yamy28508735/esd-p

🔗 𝗙𝗶𝗻𝗱 𝗼𝘂𝘁 𝗺𝗼𝗿𝗲:[en.leiditech.com]
𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝘂𝘀: sales16@leiditech.com

Søren Kjærsgaardoz1lqo@techhub.social
2025-10-26

The Pico Technology TC-08 is dated, but it’s still going strong 👍🏼 With the optional terminal board, the thermocouple channels can be used to log either voltages or 4-20mA (industrial current loop).

I’m logging the discharge curve of a 9V Alkaline battery, using an OP-AMP as a voltage divider/buffer, as the terminal board is limited to +/-5V.

The software is really easy to use and is supported on several OS 😃

There are many voltage loggers out there, but if you already have a TC-08, the small terminal board is a really nice addition and an easy way to quickly log long-term measurements 🙂

#testandmeasurement #electronicsengineering #engineer #picotech #oicotechnology

Søren Kjærsgaardoz1lqo@techhub.social
2025-10-20

The #Fnirsi battery tester has a calibration option, but how accurate is it out of the box?

Quite accurate, it would seem. Voltage measurement is precise into the mV range and my trusty old resistance standards are bang on 👌🏼😃

#electronicsengineering #testandmeasurement #electronicsengineer #battery #hamradio

Voltage testing1 Ohm test10 Ohm test100 Ohm test
Søren Kjærsgaardoz1lqo@techhub.social
2025-10-19

Finally got the #fnirsi battery tester 🙂
It measures inner resistance and voltage.

You can see how the resistance increases when the battery is depleted, that’s textbook material 👌🏼🙂

#electronicsengineering #testandmeasurement #rfengineer #electronicsengineer #batterytechnology

New 9V alkalineUsed 9V alkalineNiMH rechargeable
BLE VoiceJim8888
2025-10-15

Combating KT148A voice chip burnout in charging pile apps? Pins 7 & 8 (SPK outputs) can fry from surge/EMI. Design tip: Add an LC filter (33uH inductor + 102 cap) on the output and use twisted-pair wiring for the speaker. This simple combo filters noise and reduces common-mode interference, ensuring long-term chip stability in tough environments.

linkedin.com/pulse/kt148a-voic

Practical Solution for KT148A Voice Chip Burnout in Harsh Environments

Hello everyone,

In EV charging pile applications, we've observed a issue with the KT148A voice chip: physical burnout of pins 7 and 8 (speaker outputs). Analysis points to surge interference from large charging currents as the primary culprit.

Here's a proven two-step solution to enhance robustness in your designs:
Step 1: Integrate an LC filter (33uH/200mA inductor + 102/1nF capacitor) at the speaker output to filter surge noise.
Step 2: Utilize twisted-pair wires for speaker connections to mitigate common-mode interference.

These simple yet effective measures significantly improve EMI resistance and prevent chip damage, ensuring reliable operation in challenging environments. Have you encountered similar issues? What protection strategies have you implemented?

Let's discuss in the comments!
https://lnkd.in/gYPbASpF
#HardwareDesign #EmbeddedSystems #PCBDesign #EMI #Reliability #KT148A #EngineeringSolutionsKT148A voice chip burning out in EV chargers? Pins 7 & 8 susceptible to surges. Fix: Add LC filter (33uH+102 cap) & use twisted-pair speaker wires. Boost reliability! #HardwareDesign #EMC #EVCharging #KT148A #Engineering

https://www.linkedin.com/pulse/kt148a-voice-chip-charging-pile-applications-burnout-issue-tsui-rfpfcEnhancing KT148A Voice Chip Reliability in EV Charger Applications

In the demanding environment of electric vehicle (EV) charging piles, the KT148A voice chip can face significant challenges, particularly the burnout of pins 7 and 8 (speaker outputs) due to electrical surges and EMI from high charging currents.

To address this, we recommend two key design improvements:
1. Implement an LC Filter: Add a 33uH/200mA inductor and a 102 (1nF) capacitor in an 0805 package to the speaker output. This filter helps suppress surge noise and stabilizes the signal.
2. Use Twisted-Pair Wiring: For speaker connections, twisted-pair wires effectively reduce common-mode interference and enhance EMI immunity.

These protective measures are crucial for ensuring the long-term stability and durability of the KT148A in complex applications like EV chargers. Proactive design considerations can prevent physical damage and improve overall system robustness.

#KT148A #EVCharging #HardwareDesign #EmbeddedSystems #EMC #ReliabilityEngineering #SurgeProtection
Søren Kjærsgaardoz1lqo@techhub.social
2025-10-04

Forgot the high load test 🤷🏼‍♂️😂 Here you go 👌🏼
#electronicsengineering #testandmeasurement

Søren Kjærsgaardoz1lqo@techhub.social
2025-10-04

The LM73100 is almost a magical component: it functions as an ‘ideal diode’ with just 30-40mOhm series resistance. At 5A it shows a bit of a positive temperature coefficient, so the loss is higher when it heats up, but still, it only has about 200mV drop at that load 😳

It gets warm, about 90C, but it’s still impressive for such a small surface mounted device.

I’ll be using it to charge batteries at max 3A, at which it remains stable at a much lower 50C 🙂

#electronics #electronicsengineering #engineer #testandmeasurement #fnirsi #dps150 #adafruit

Testing the Adafruit LM73100 breakout board
Søren Kjærsgaardoz1lqo@techhub.social
2025-09-24

Decided to test the input bias current of some different OP-AMPS at 5V input. The 741 does quite well at 30nA, the 5532 is quite higher, 189nA, still within spec., and the LMC662 maxes out my Keithley 2400, last digit just wiggles all over the place… Need to power up the 3458A and make a decent setup on a small PCB.. That’s another night ☺️

#testandmeasurement #electronics #electronicsengineering #voltnut #rfengineer #hamradio #hamr

741 input bias5532 input biasLMC 662 input bias
Søren Kjærsgaardoz1lqo@techhub.social
2025-09-17

Occasionally it can be a good idea to add an in-line diode to protect a power supply used to charge a battery.

You want the resulting voltage drop as low as possible which calls for a high-power Schottky diode. The STM STPS5L60 is a 60V diode, rated at maximum 5A continuously. As I’ll be charging at maximum 3A, I decided to test the voltage drop and resulting case temperature at that load.

I measured a 0.38V drop, resulting in about 1.15W dissipated - not bad 😃

The outer case temperature rose to about 57C which is fully acceptable and way below the diodes limits. And it’s touchable as well, which is nice.

So, charging a LiFePO4 battery for my #hamradio #SOTA and #POTA operations, I’ll set the supply to 15V, limit the current to 3A, and the battery’s built in BMS controller will handle the rest, easy! 👌🏼🙂

For the record, I always keep an eye on it when charging and I usually reduce the current by the end of the charge cycle ☝🏼

#electronics #electronicsengineering #hamr #testandmeasurement #rfengineer

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