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Demo, teardown and reverse engineering of the Tolicore 3720 Femtoammeter and voltage source. https://tolicore.com/products/3720-femtoammeter-voltage-source/ https://tolicore.com/product-documents/3720-Datasheet.pdf Keithley low current measurement handbook: https://www.tek.com/en/documents/product-article/keithley-low-level-measurements-handbook—7th-edition Counting LED photons video: https://www.youtube.com/watch?v=TJcMgoJ4DOE 00:00 – Femtoammeter measurement 01:16 – Tolicore 3720 Femtoammeter unboxing 03:39 – Power on and UI 05:18 – 20pA full scale range 10:13 – …

2026 Electronex Show Walkaround Forum: https://www.eevblog.com/forum/blog/eevblog-1754-2026-electronex-show-walkaround/ Podcast: Download

Bart from Cleverscope returns to discuss and show off designing a 2000V isolated oscilloscope, and demonstrates measuring high voltage GaN transistors and Solid State Transformers. https://cleverscope.com/products/CS548 Forum: https://www.eevblog.com/forum/blog/eevblog-1753-designing-a-2000v-isolated-oscilloscope-(cleverscope)/ Podcast: Download

WTF were Texas Instruments thinking changing the design and major specs of the 45+ year old jellybean NE5532 audio opamp WITHOUT changing the part number?! New datasheet: https://www.ti.com/lit/ds/symlink/ne5532.pdf Old datasheet: https://www.mouser.com/datasheet/2/405/ne5532a-556776.pdf Change Notification: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/5726/PCN20231114002.1.pdf Onsemi datasheet: https://www.onsemi.com/pdf/datasheet/ne5534-d.pdf Forum thread: https://www.eevblog.com/forum/chat/ti-ne5532-audio-opamp-changes/ OPI134: https://www.ti.com/lit/ds/symlink/opa4134.pdf 00:00 – TI have changed the classic jellybean …

5 different ways to measure phase angle on your oscilloscope. 00:00 – What is phase angle measurement? 01:48 – Automated measurement 06:38 – Cursor Measurement 12:24 – Graticule measurement 13:55 – Positive or Negztive? A trap for young players 14:50 – Another graticule method using horizontal shift 16:00 – How …

More Mailbag! 00:00 – Linus Tech Tips Screwdrivers! https://www.lttstore.com/collections/ratcheting-screwdrivers https://www.lttstore.com/collections/precision-multi-bit-screwdriver 15:30 – Closer look at the screwdrivers 18:52 – Red Light Skin Therapy device 22:31 – Spectrum measurements 27:19 – EZABoard Arduino Learning Kit https://ezaboard.com/ Videos shot on 16mm film! https://odysee.com/@MatthewMulder:d 35:40 – Vintage Tek Museum CurveBug Curve Tracer Debugging …

Review of the Werewolf VFLEX USB-C power supply cable system. https://werewolf.us/collections/werewolf-products/products/vflex-3-pack-starter-kit Forum: https://www.eevblog.com/forum/blog/eevblog-1749-werewolf-vflex-usb-c-power-supply-adapters/ Podcast: Download

The dumpster really delivered today, with no less than FOUR 4K Retina display iMac’s! Plus a Nikon DSLR camera! Forum: https://www.eevblog.com/forum/blog/eevblog-1748-dumpster-imac-bonanza/ Podcast: Download

Demonstrating the difference between Schottky diodes and PN junction silicon diodes, and how your multimeter can influence your measurement when troubleshooting. Answering an interesting Twitter question. https://x.com/blind_via/status/2052223991839170919 https://www.tti.com/content/ttiinc/en/resources/blog/infographics/schottky-diodes.html https://engineering.purdue.edu/~ee606/downloads/ECE606_f12_Lecture17.pdf Forum: https://www.eevblog.com/forum/blog/eevblog-1746-schottky-vs-pn-diodes-measurement-traps/ 00:00 – Twitter question 01:21 – Recreating the problem 03:08 – Why doesn’t it read zero volts? Let’s try …

A tribute to the 555 timer and Hans Caminzind, which turns 55 years old this year. Released on May the 5th, International 555 Timer Day at 5:55pm with a length of 5:55 And Dave demonstrates blowing out the birthday candle with his 555 Killer One Shot circuit. Use coupon code …

Walk time rant. The NBN Internet in the Norwest Business Park has been down for 6 days now since April 24th, and was supposed to be fixed today. But the latest update is now 8th May! This impacts thousands of businesses in the business park, and Telstra mobile is on …

Testing the loudness of a new version of the BM2257 multimeter firmware using the CRY2851 Class 1 sound level meter. https://www.crysound.com/product/cry2851-sound-level-meter/ COUPON CODE: LOUD for 10% off the BM2257 Hardware Store: https://eevblog.store/ 00:00 – BM2257 Firmware changes 01:58 – Crysound CRY2851 Class 1 Sound Level Analyser 06:26 – Lab baseline …

The DP700 is Micsig’s third suck of the sav on a high voltage differential probe. Not to be confused with the MDP700 which this replaces. https://www.micsig.com/DPA/ 00:00 – Comparison to the DP10007 and MDP700 03:58 – Unboxing of the DP700 05:52 – CMRR measurement hardware setup 09:52 – Sanity check …

Dave shows you how to use your oscilloscope probe to detect mechanical vibrational modes on your PCB. And shows off the Crysound Acoustic Imaging Camera! https://www.kickstarter.com/projects/pocket-acoustic-cam/crysound-pocket-acoustic-imaging-camera/ Forum: https://www.eevblog.com/forum/blog/eevblog-1743-mechanical-vibration-detection-with-your-oscilloscope-probe/ Podcast: Download

More Dumpster Diving. What did we score today? Forum: https://www.eevblog.com/forum/blog/eevblog-1742-today-in-the-dumpster-room/ Podcast: Download