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The failed PedalCell CadenceX Bike Generator from the previous mailbag video is tested, torn down, analysed, hilrariously laughed at, and dodgily repaired.
https://pedalcell.com/

00:00 - Failed Pedalcell generator - getting the pinout
02:00 - The PCB
02:40 - Oscilloscope rotation test
03:45 - Dremel speed Captain!
04:22 - Generator teardown
05:32 - Hmm, what's going on with these stator coils
06:00 - Hall effect sensors
06:58 - A-HA Gotcha. These magnets make no sense at all!
08:47 - Someone skimped at the glue factory
11:27 - It's just a BLDC Brusshless DC motor being used as a generator
12:48 - Nothing that can't be fixed with some epoxy
14:00 - Vrooooom!

Forum: https://www.eevblog.com/forum/blog/eevblog-1485-pedalcell-cadencex-bike-generator-lol-fail!/

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#ElectronicsCreators #FAIL #Pedalcell

Extended version of the Mailbag 1483 teardown of the Kaba Mas X-09 High Security Electronic Lock Teardown

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#ElectronicsCreators #Teardown #lock

Bumper Mailbag!

Forum: https://www.eevblog.com/forum/blog/eevblog-1483-holy-mailbag-bomb-batman/

SPOILERS:
00:00 - Contact Harald Covid Bluetooth Tracing
04:24 - Kaba Mas X09 High Security Electronic Tumbler Lock Teardown
Extended teardown video here: https://www.youtube.com/watch?v=3WSIfHOv3fc
16:53 - Failed PedalCell CadenceX Bike USB Power Generator
18:00 - Odysee vs Patreon for supporting creators
19:06 - PedalCell CadenceX Teardown
26:54 - TikStation Breadboard USB power supply
https://www.tikstation.com/
38:54 - CircuitMess JAY-D education DIY kit
https://circuitmess.com/
45:26 - Call the BOMB SQUAD!
47:33 - Audio-Technica BONANZA!
52:22 - Teardown Audio-Technica ATR6550x vs Rode NTG-1 Shotgun Microphone
https://www.tag.com.au/

Doug Ford Microphone design series: https://www.youtube.com/playlist?list=PLvOlSehNtuHv98KUcud260yJBRQngBKiw

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#ElectronicsCreators #Mailbag

A follow up to the previous video on repairing the heater.
A viewer asked how the capacitor diode rectifier gave a 24V output. The key is in the zener regulator, so this vidoe looks at how mains powered zener voltage regulators work, and their limitations.
X class capacitor and self healing.
Zener diode tutorial video: https://www.youtube.com/watch?v=O0ifJ4oVdG4

Forum: https://www.eevblog.com/forum/blog/eevblog-1482-mains-capacitor-zener-regulator-circuit/

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#ElectronicsCreators #Tutorial #Zener

A heater that doesn't heat up should be an easy and quick repair, right? RIGHT?
This Arlec space heater also has a rather dodgy and product recall worthy dangerous construction!

00:00 - Arlec space heater
05:12 - Heater element measurement
07:31 - PCB inspection
11:31 - Verifying the fault
12:50 - Relay bypass
13:21 - Thou shall measure voltages
15:00 - Diode bridge
15:48 - Gotcha!
17:34 - Parts salvage time
18:48 - Jaycar visit
20:49 - Mains capacitive divider
23:02 - X and Y class capacitors

Forum: https://www.eevblog.com/forum/blog/eevblog-1481-dodgy-dangerous-heater-repair/

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#ElectronicsCreators #Repair #Arlec

Are solar powered electric cars viable? Let's look at the Lightyear Zero solar powered electric car and examine the claims. Can you get a useless extended range by adding solar panels to an electric car?
Dave just so happens to drive a solar powered electric car, so let's find out!

Zappi solar car charger video: https://www.youtube.com/watch?v=EYx46kRv2Bw

Forum: https://www.eevblog.com/forum/blog/eevblog-1480-lightyear-zero-solar-powered-electric-car/

00:00 - Lightyear Zero the world's first solar powered production electric car
01:45 - Under certain conditions...
03:10 - Dave drives a solar powered electric car!
06:06 - Is a fully solar powered electric car possible?
07:34 - Let's order one! It's only EUR$250,000...
08:46 - How big is the solar panel and what is the output power?
10:28 - It's a helpful gimmick. Let's do the winter & summer calculations
13:22 - Nope, it's not going to meet the 70km/day extra range claim
13:50 - But in theory, could you do it...
14:46 - Solar power output varies a lot, let me show you...
16:22 - No they aren't going to power themselves and they aren't revolutionary.
18:40 - The Aptera solar power electric car still doesn't do it

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#debunking #Lightyear #Solar

Is your calculator WRONG? It could be!
Looking at the issue of implied multiplication and how it can affect your calculations. Why do some Casio and TI calculators give a different result to others? And why do they differ from your phone calculator, google calculator, or Wolfram Alpha?
How Order of Operations matters.

TI explains the differences in models and why: https://education.ti.com/en/customer-support/knowledge-base/ti-83-84-plus-family/product-usage/11773

The How and Why of Mathematics video on the issue: https://www.youtube.com/watch?v=4x-BcYCiKCk

Forum: https://www.eevblog.com/forum/blog/eevblog-1479-is-your-calculator-wrong/

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#ElectronicsCreators #Calculator #maths

Testing the new Tektronix 2 series waveform update rate vs older Keysight, Siglent, and Rigol scopes, and a glitch signal demonstration on how it matters in the real world.
And also how to measure the waveform update rate on your scope.
This is not a review, and was going to be a 2nd channel video, but people voted to have it on the main channel so here it is.

00:00 - How to measure oscilloscope waveform update rate
04:00 - An annoying feature? Setting the memory depth...
06:03 - It actually tells you on the screen!
11:11 - Comparison with the Keysight 1000X series
15:37 - Real world glitch testing
18:08 - Comparison with the Siglent SDS1104X-E
18:54 - Comparison with the Rigol DS2202

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#ElectronicsCreators #oscilloscope #Tektronix

A world exclusive teardown of the new generation Tektronix 2 Series MSO bench/portable oscilloscope!
An innovative new design form factor you're either going to love or hate!
This is the upgrade to the 15yo MSO/DPO 2000B series to give a low end on the next generation 2/3/4/5/6 series.
https://www.tek.com/en/products/oscilloscopes/2-series-mso

Unboxing and first reaction video: https://www.youtube.com/watch?v=nO09bc5ozng
Talk with Andy Tedd from Tektronix about the design of the new 2 Series: https://www.youtube.com/watch?v=PcxEO3fA_Ls
Hi res teardown photos: https://www.eevblog.com/2022/06/07/eevblog-1477-world-exclusive-teardown-tektronix-2-series-oscilloscope/

00:00 - World Exclusive Teardown of the new Tektronix 2 Series Oscilloscope
00:39 - The stand is a thing of beauty and a joy forever
01:13 - The tablet-like form factor and VESA mount & design decisions
02:55 - Teardown - PCB design driving the case design
05:03 - Was there room for real buttons?
06:12 - The power and grounding interface and why is it on the side?
07:51 - Was there room for an internal battery pack?
08:35 - The VESA mount
09:28 - Back side of the analog front end
13:12 - True single PCB design
15:07 - Don't forget your knobs!
15:40 - Internal fans
16:37 - BNC interface
18:32 - One-piece metal chassis and heatsink design
18:59 - The PCB
21:59 - The Tek026 analog front end revealed
23:49 - DaveHead commentary and closer look at the bottom side PCB
26:26 - Top side PCB commentary
26:42 - Custom Tek Arg Gen ASIC ADG395C
27:23 - FPGA BGA thermal expansion glue
28:06 - Xilinx ZYNQ UltraScale+ FPGA
29:02 - The Lexington architecture block diagram
31:18 - Why so much sample memory?
32:38 - Product positioning and crippling
34:47 - The ADC - It's NOT the Tek049
37:29 - Trigger input, PLL, and Battery input switching
38:24 - Digital Inputs
39:24 - External battery pack teardown
43:00 - Playing with the funky stand

Forum: https://www.eevblog.com/forum/testgear/new-next-gen-tektronix-scope/

Su..

Teardown of the Keithley 515A Megohm Wheatstone bridge, plus a tutorial on how Wheatsone bridges work and their applications.
Manual & Schematic: https://download.tek.com/manual/515A(Model515A).pdf
1960's Daven precision resistor and attenuator catalog: http://www.technicalaudio.com/pdf/Daven/Daven_attenuator_switch_lab_Catalog.pdf
Keithley electrometer teardown: https://www.youtube.com/watch?v=LI_5ANmkVqo

00:00 Keithley 515A Megohm Wheatstone bridge
03:50 - The Magic smoke test
04:00 - Zero check test
04:40 - Standardise calibration step
05:30 - Range calibration
06:21 - Measuring a 200M resistor
09:41 - Confirmation with a Keithley DMM7510 7 1/2 digit multimeter
10:37 - Weatstrong Bridge Tutorial
14:55 - Gaurd traces for high impedance measurement
16:22 - Teardown
28:25 - OUCH!

Forum: https://www.eevblog.com/forum/blog/eevblog-1476-keithley-515a-wheatstone-bridge-teardown-tutorial/

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#ElectronicsCreators #Teardown #Keithley

The constant pressure Youtubers are under to produce content that out-views their previous videos.
The Algorithm will recommend your latest video more only if it does better than your previous videos.

Twitter discussion, check out Marcus House's response:
https://twitter.com/eevblog/status/1531085643383971840
How to demotivate a Youtube: https://www.youtube.com/watch?v=djGhrpxbnFU

Forum: https://www.eevblog.com/forum/blog/eevblab-98-the-pressure-youtubers-are-under/

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#Youtube #Youtuber

Answering another viewer question. Can we identify or find an alternative for this SMD part?
https://twitter.com/PoiSolutionsLLC/status/1529065036433571840

Forum: https://www.eevblog.com/forum/blog/eevblog-1475-smd-part-indentification-substitution-search/

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#ElectronicsCreators #SMD #Components

The Verge just took Apple to task over their new authorised repair tools, manuals and parts as part of Right to Repair. Are they giving Apple a fair suck of the sav?

https://www.theverge.com/2022/5/21/23079058/apple-self-service-iphone-repair-kit-hands-on
Apple press release on self service: https://www.apple.com/newsroom/2022/04/apples-self-service-repair-now-available/
Apple service manuals: https://support.apple.com/self-service-repair
Apple repair parts store: https://selfservicerepair.com/
Paul Daniels FlexBV board view software: http://pldaniels.com/
Louis Rossmann: https://www.youtube.com/user/rossmanngroup

Forum: https://www.eevblog.com/forum/blog/eevblab-97-is-apple-serious-about-right-to-repair-(the-verge)/

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#ElectronicsCreators #Apple #Right2Repair

Can you measure capacitors in-circuit with an LCR meter?

Part 1 video: How an LCR meter Works: https://www.youtube.com/watch?v=D9J-AmCcf4U

Forum: https://www.eevblog.com/forum/blog/eevblog-1473-how-your-lcr-meter-works/

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#ElectronicsCreators #Measurement #Capacitors

How an LCR meter works.
Part 2: In-circuit bench testing video: https://www.youtube.com/watch?v=Uds-wLoaZmA

Forum: https://www.eevblog.com/forum/blog/eevblog-1473-how-your-lcr-meter-works/

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#ElectronicsCreators #LCR #Tutorial

How to solve the resistor cube problem using equipotential nodes, short and open techniques, and circuit simplification.
Gausian resitors: https://www.youtube.com/watch?v=1WAhTdWErrU
Kirchhoff's Laws: https://www.youtube.com/watch?v=WBfAEeEzDlg
Forum: https://www.eevblog.com/forum/blog/eevblog-1472-resistor-cube-problem-solved/

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#ElectronicsCreators #Tutorial

What's in the Mailbag?

SPOILER:
00:00 - Mailbag
00:41 - Laser etched Delorean Time Machine
https://momentsetchedintime.com.au/
03:29 - Encryption Class C wall mount rack cabinet
05:30 - Russian multimeter with a most UNUSUAL range switch!
08:44 - Smell'o'vision
11:51 - Bob Widlar PCB plaque
15:16 - How to get 5 different colours on a PCB
19:26 - Mr A.C Coupling TENS unit teardown
29:55 - Shannon Tweezers LCR Tweezers
https://www.eevblog.com/forum/testgear/design-a-new-precision-lcr-tweezers/
http://shannontweezers.top/
36:48 - MYSTERY processor!

Forum: https://www.eevblog.com/forum/blog/eevblog-1471-mailbag/

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#ElectronicsCreators #Mailbag

If you think the Australian Standards should be FREE then please sign this petition. Currently you have to pay many hundred of dollars to a foreign company to buy these standards if you are working on project that requires them.
https://www.aph.gov.au/e-petitions/petition/EN4101
https://en.wikipedia.org/wiki/Standards_Australia
Aircon wiring: https://www.youtube.com/watch?v=XD5Emhqd5Ks

Forum: https://www.eevblog.com/forum/chat/petition-to-openreform-australian-standards-availability/

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#ElectronicsCreators #petition #australia

Complex numbers are NOT complex!
How complex numbers are used in AC circuit analysis.

00:00 - Complex Numbers
00:44 - Phasor graphical addition
01:22 - Why do calculators have the R-P and P-R buttons?
02:44 - Phasor diagram
03:59 - The AC voltage equation
04:47 - The complex plane and j vs i imaginary axis
06:21 - The Rectangular and Polar forms
07:36 - The j operator
10:38 - Polar and Rectangular format conversion
11:50 - Plotting points on the complex plane

Forum: https://www.eevblog.com/forum/blog/eevblog-1470-ac-basics-tutorial-part-3-complex-numbers/

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#ElectronicsCreators #tutorial

Part 2 of the AC Basics tutorial series. What are phasors and doing phasor addition. In-phase, out of phase, and leading and lagging waveforms.
Phi vs Theta phase angle.
Leading into complex numbers in Part 3.

00:00 - AC Basics Theory
00:40 - Hop an AC waveform is produced
01:37 - Degrees, Radiand and Gradians
02:30 - The ugly equation for AC voltage
03:08 - Theta vs Phi
03:51 - AC Ohms Laws, vectors, and impedance
04:42 - Phasors
05:24 - Two AC waveforms and phasor analysis
07:20 - Out of phase signals
08:50 - Phase shift
09:48 - Two sine waves always make another sine wave
10:22 - Angular frequency
11:45 - Phasor diagram
13:04 - How to add two phasors graphically
16:56 - CIVIL: Capacitors and Inductors with current Leading and Lagging
18:19 - Leading into Complex Numbers

Part 1: https://www.youtube.com/watch?v=rrPtvYYJ2-g

Forum: https://www.eevblog.com/forum/blog/eevblog-1469-ac-basics-tutorial-part-2-phasors/

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#ElectronicsCreators #Tutorial #AC

A walk around the 2022 Electronex show in Sydney.

00:00 - Electronex 2022
01:13 - Phoenix Contact
01:38 - Tektronix
03:14 - Siglent
04:37 - John South at Emona + New Rigol StationMax Oscilloscope
07:38 - Harbuch Electronix isolation transformers
09:38 - Mantis remote 3D viewing microscope
12:05 - SMCBA talks
15:04 - Wago
16:33 - More Mantis microscopes
17:26 - Wurth Electronics fan encounter
17:49 - Microchip
19:03 - Nano Dimension 3D PCB Printer
22:14- Chemtronics soldering robot
24:50 -Wire stripping and crimping machines
25:22- Rohde & Schwarz
29:53 - Yamaha Pick & Place machine
33:03 - Ask Iispex 3 3D microscope
33:44 - JBC Micro cordless soldering station and micro hot air pencil
39:16 - Neoden Pick & Place
40:52 - Selective soldering machine
42:20 - Keysight
44:00 - More Rigol

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Stanford University researchers have made a solar panel that works at nighttime!
It will reduce or eliminate the need for battery storage! TAKE THAT Big Oil!
You can probably guess how it works... Let's BUST this impractical boondoggle wide open.

The research paper: https://aip.scitation.org/doi/pdf/10.1063/5.0085205

Forum: https://www.eevblog.com/forum/blog/eevblog-1466-stanford-solar-power-at-nightime-busted/

00:00 - Pulitzer prize winning twitter Blue Checkmark time
00:35 - If Stanford University did the research, it has to be true!
02:35 - Take that Big Oil!
03:35 - The Thermoelectric Generator AGAIN...
04:10 - It generates HOW MUCH power at night time?
06:02 - Let's run the numbers on Dave's LG panel system
08:04 - It's not much better than ONE 18650 cell. LOL
09:37 - Tech journalists should be able to multiply and divide.
10:09 - Reading the paper
11:50 - Photos of the prototype

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#ElectronicsCreators #Solar #Debunking

It's been a while since the dumpster has delivered a computer. Today we get a HP Proliant ML350p Gen8 xeon server. Does it work?

Forum: https://www.eevblog.com/forum/blog/eevblog-1466-dumpster-dive-xeon-server/

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How you can use your multimeters capacitance range to measure inductors, using the reciprocal method.

Forum: https://www.eevblog.com/forum/blog/eevblog-1465-measure-inductors-using-a-multimeter/

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The TOP 5 Jellybean comparators, plus a bonus and special snowflake choice.

00:00 - Jellybean Comparators
01:20 - Traps for young players using Opamps as comparators
04:43 - Is the old School LM311 still THE jellybean?
https://www.ti.com/lit/ds/symlink/lm311-n.pdf
11:17 - TS391 Small single comparator
https://www.mouser.com/datasheet/2/389/cd00001660-1795546.pdf
16:33 - LM393/LM2903 Dual comparator
https://www.ti.com/lit/ds/symlink/lm393a.pdf
21:27 - LM339/LM2901 Quad comparator
https://www.ti.com/lit/ds/symlink/lm139-n.pdf
22:52 - LMV331/LMV393/LMV339 Low voltage jellybean comparator
https://www.ti.com/lit/ds/symlink/lmv331-n.pdf
31:50 - TS3021 Fast precision rail-rail comparator
https://www.mouser.com/datasheet/2/389/cd00118313-1796660.pdf
34:45 - TSM102 Special snowflake kitchen sink Opamp/Comparator/Reference
https://www.ti.com/lit/ds/symlink/tsm102.pdf

Jellybean Opamps: https://www.youtube.com/watch?v=uq1DMWtjL2U
Jellybean Regulator & References: https://www.youtube.com/watch?v=YHRxvUqy3Uw

Forum: https://www.eevblog.com/forum/blog/eevblog-1464-top-5-jellybean-comparators/

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Created 4 years, 8 months ago.

597 videos

Category Science & Technology

NO SCRIPT, NO FEAR, ALL OPINION
An off-the-cuff Video Blog about Electronics Engineering, for engineers, hobbyists, enthusiasts, hackers and Makers
Hosted by Dave Jones from Sydney Australia

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