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

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

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

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.

#ElectronicsEngineering
#TernaEngineeringCollege
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#ElectronicsEngineer
#CareerProspects #NaviMumbaiEngineering

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 👇
https://medium.com/@yamy28508735/ultra-low-voltage-drop-schottky-for-switching-power-supplies-mbr40h100cdm-0319e7fca001

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

#ElectronicsEngineering #PowerSemiconductor #Rectifier #TMBS #Schottky #LowVF

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

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👉
https://medium.com/.../temperature-controlled-bimetallic...

https://medium.com/@yamy28508735/esd-protection-practice-3-selection-guide-and-layout-optimization-tips-for-leiditech-esd-diodes-53904da4fb5f

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𝗖𝗼𝗻𝘁𝗮𝗰𝘁 𝘂𝘀: sales16@leiditech.com

#ESDProtection #EMCDesign #Leiditech #HighSpeedDesign #PCBLayout #ElectronicsEngineering

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

Understanding Boot Modes in Microcontrollers

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#EmbeddedSystems #PiEmbSysTech #BootMode #Microcontroller #STM32 #AUTOSAR #Bootloader #Firmware #Innovation #EmbeddedLearning #ElectronicsEngineering #IoT

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

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

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. #KT148A #HardwareDesign #EmbeddedSystems #EMC #SurgeProtection #EVCharging #ElectronicsEngineering #Reliability

https://www.linkedin.com/pulse/kt148a-voice-chip-charging-pile-applications-burnout-issue-tsui-rfpfc

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

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

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

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

🔊 Audio file update instructions for JieLi (JL) Bluetooth Test Box

Update via:
Method 1: Re-upgrade slave code (master doesn’t need upgrade).
Method 2: Run AC690x_1T2 Test Box_Slave V1.0.4.exe to generate jl_690x.bin, then update using Method 2 of firmware upgrade.

https://www.linkedin.com/pulse/jieli-jl-bluetooth-test-box-audio-file-update-junluan-tsui-7houc

Ideal for embedded developers and hardware engineers! #Bluetooth #EmbeddedSystems #HardwareDesign #JieLi #AC690x #FirmwareUpdate #ElectronicsEngineering

Electronics people, I had this absolutely cursed idea of using both the body diode and the gate capacitance of a MOSFET to drive many LEDs via charlieplexing. Would this work? The idea is that I have one LED_VCC, many Q4 MOSFESTs, and multiple LEDs per MOSFET. It avoids sharing one MCU pin with many LEDs, instead using the MOSFET that is rated for a much higher current than a GPIO pin.

Specific steps in reply.

#electronics #ElectronicsEngineering

So many have tried and tested this little box, with all kinds of varying results, I thought I’d have a go myself .. 🙂

It’s really not too bad on the noise side and I won’t be using it at high loads for sensitive circuits anyway. PSU noise measurements have a lot of pitfalls, I’ve seen people being disturbed by their overhead (LED) bench light strips, wondering what was going on 😂🤷🏼‍♂️

Correct probe attachment and measurement bandwidth (most new scopes have a 20MHz option) is essential for tests like these.

A nice little addition to the lab, much more portable and quick-to-use than my bulky, linear, GW bench supply 🙂
#electronics #electronicsengineering #hamradio #hamr #testandmeasurement