EEVblog

By David L. JonesTechnology Education

EEVblog episodes

June 24 EEVblog 1753 – Designing a 2000V Isolated Oscilloscope (Cleverscope)
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)/
27 min
June 05 EEVblog 1752 – Texas Instruments SCREWED UP the NE5532
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 NE5534
03:27 – Product Change Notifications (PCN’s)
06:43 – List of the changes
09:07 – Don’t worry abut that 600ohm load rubbish
10:45 – Let’s look at other manufacturers
12:50 – The OPA134 has a WILD change!
18:15 – They formally claim the changes have NO IMPACT! This could get them sued…
19:20 – Is the Single NE5534 impacted?
20:30 – This LMH6518 change might be killing oscilloscopes!
23:25 – Here is how it’s done: LM317
General forum related to this video: https://www.eevblog.com/forum/blog/eevblog-1752-wtf-texas-instruments-big-ne5532-changes/
28 min
May 29 EEVblog 1751 – Oscilloscope Phase Measurement Masterclass
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 to increase horizontal measurement resolution
17:55 – Lissajous figure (X-Y mode) measurement
22:14 – Measure phase angle using Voltage? Yes, it’s possible!
Forum: https://www.eevblog.com/forum/blog/eevblog-1751-oscilloscope-phase-measurement-masterclass/
24 min
May 29 EEVblog 1750 – Mailbag
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 Tool
https://vintagetek.org/curvebug/
Forum: https://www.eevblog.com/forum/blog/eevblog-1750-mailbag/
49 min
May 22 EEVblog 1749 – Werewolf VFLEX USB-C Power Supply Adapters
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/
16 min
May 13 EEVblog 1748 – Dumpster iMac BONANZA!
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/
13 min
May 09 EEVblog 1746 – Schottky vs PN Diodes & Measurement Traps
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 PN junction diode
04:21 – Schottky vs PN Junction diodes, they are NOT the same!
06:06 – What about a diode tester?
07:15 – Why doesn’t the Schottky diode work like a diode?
08:39 – It’s a multimeter measurement TRAP!
10:37 – A closer look at Schottky diodes
14:21 – Datasheet inspection, and advantages vs disadvantages of Schottky diodes
15:21 – Reverse leakage current, PN vs Schottky
17:16 – THREE orders of magnitude difference!
22:29 – Digital vs Analog multimeter, Analog WINS!
25 min
May 05 EEVblog 1746 – The 555 is 55 Years Old!
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 555 for 5% off on the EEVblog store
Hardware Store: https://eevblog.store/
https://spectrum.ieee.org/chip-hall-of-fame-signetics-ne555
https://www.righto.com/2016/02/555-timer-teardown-inside-worlds-most.html
http://www.historyofelectronics.com/Much-Ado-About-Almost-Nothing.pdf
Forum: https://www.eevblog.com/forum/blog/eevblog-1746-the-555-is-55-years-old!/
6 min
April 27 EEVblog 1745 – How LOUD is the Continuity Tester
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 dBA measurement
07:39 – dBA vs dBC vs dBZ weighting
08:51 – BM2257 Buzzer measurements
10:06 – Low frequency spectral analysis (How Low is Dave’s voice?)
11:00 – Designing and building a DIY acoustic test chamber
11:57 – BM2257 frequency spectrum analysis
14:04 – Different angle and distance repeat measurement
15:09 – Conclusion
17:26 – Bonus ventilation fan measurement
Forum: https://www.eevblog.com/forum/blog/eevblog-1745-how-loud-is-the-continuity-tester/
20 min
April 15 EEVblog 1744 – NEW Micsig DP700 High Voltage Differential Probe
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 gain and bandwidth check.
11:29 – Zero function
12:25 – Measuring the CMRR
16:30 – Trap for young players. RMS vs AC RMS, it’s all in the sigma
17:44 – Another trap for young players, double sigma
19:07 – CMRR at 100MHz
22:41 – Real world test on a 100V GaN MOSFET
25:28 – Teardown
29:44 – PCB inspection
Forum: https://www.eevblog.com/forum/blog/eevblog-1744-new-micsig-dp700-high-voltage-differential-probe/
Teardown photos:
37 min