New Book: The Art of Electronics 3rd Edition | In The Lab With Jay Jay

This post is part of my video blog: In The Lab With Jay Jay.

Silly Job Title: Charge Charmer

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This video is part of the New Book feature of my video blog.

In this video I review the venerable The Art of Electronics 3rd Edition. It’s a long video, because this is a long book!

While I was writing up these notes for the video I found a wealth of fun stuff. Here are a few links:

PHP shutdown handlers and exit codes

I was in bed trying to get to sleep but my brain wanted to know the answer to this question. So I was forced out of bed to write this experiment:

function main( $argv ) {

  register_shutdown_function( 'shutdown_1' );
  register_shutdown_function( 'shutdown_2' );

  exit( 0 );


function shutdown_1() {

  exit( 1 );


function shutdown_2() {

  exit( 2 );


main( $argv );

With this PHP code, what do you expect is the resultant error level?

The answer is ‘1’. After main() calls exit( 0 ) the shutdown function shutdown_1() is invoked. When shutdown_1() calls exit( 1 ) the process exists and shutdown_2() is never called.

I’m glad we cleared that up. Back to bed.

Diode Experiment | Project 3/10 | Maxitronix 10in1 | In The Lab With Jay Jay

This post is part of my video blog: In The Lab With Jay Jay.

In this video I do the third Maxitronix 10in1 Electronic Project Lab project: Diode Experiment.

When I looked at the resistor on the bottom I thought it was red – brown – black – gold which would have been 21Ω but I think I misread brown and that was actually purple which would be 27Ω which stacks better with the two measurements I made both of which said 27Ω.

In the video we examine the forward voltage of our germanium diode and get various readings. Typically a germanium diode should be around 0.3V versus silicon diodes which are usually around 0.7V.

The component testers we use are these:

On the FNIRSI component tester the Ir is the “reverse current”, also known as the “leakage current”. This is the small amount of current which flows through the diode when it is reverse biased (that is, basically, connected the wrong way around).

I asked ChatGPT a few questions about diodes and their specifications which you can read here: Germanium Diode Forward Voltage if you’re at all interested in such things. Of course you should be doubly suspicious of anything you read on the internet. :)

The really amazing learning for me in this experiment was how hot the germanium diode got versus the lamp, which was so surprising. Just goes to show how good an idea it is to actually do experiments and measure things! The thermal imager we used was the UNI-T UTi260B.

Also I think I’m coming around to the view that an oscilloscope is a pretty poor voltmeter. My oscilloscope is an MSO5074 70MHz 4 Channel MIXED SIGNAL OSCILLOSCOPE and I love it but I think in future I will limit my use of the oscilloscope to situations where I’m actually dealing with some sort of oscillator. I think simple digital multimeters would have been better test equipment to use for the kinds of readings I was trying to take in this experiment.

I hope you enjoy the video. Stay tuned for the upcoming projects. If you’re interested in seeing them don’t forget to subscribe!

Also, if you’re interested in getting any of these Maxitronix kits yourself the best place I know to look is on eBay. Let me know if you find them somewhere else!

Here is a table of products I use which may appear in my video with affiliate links to vendors if you would like to buy. The link given here won’t necessarily have the best price so please do shop around to see if you can find a better deal. If you have thoughts or questions please feel free to let me know. Let’s go shopping!

Equipment Affiliate Link Notes

Rigol MSO5074 Mixed Signal Oscilloscope

FILCO Majestouch 2SS 87-key mechanical keyboard
Tenkeyless 87-key: FILCO Majestouch 2SS Edition Tenkeyless English Layout Cherry MX Speed Silver Axis with 3 Red Key Locks, Black FKBN87MSS/ECSP2B-RKL notes

gku Underdesk Keyboard Drawer
gku™ Underdesk Keyboard Drawer under desk keyboard tray and storage AC1009 notes

UNI-T UTi260B Thermal Imager
UNI-T UTi260B Infrared Thermal Imager 256 x192 Industrial Handheld Testing Thermometer For Repair Floor Heating Thermal Camera notes

Leadstar 12″ LCD TV
Prechen 11.6 Inch Small HDMI Monitor 1366×768 Small PC Monitor TFT LCD Monitor Built-in Speaker with HDMI VGA AV BNC USB Input Mini HD Color Screen Display notes

UPERFECT Portable Monitor 15.6″ Computer Display (100% sRGB High Color Gamut) 1920×1080 USB C Monitor FHD Eye Care Gaming Screen IPS Mini HDMI Type C OTG Dual Speaker VESA, Included Smart Cover Stand notes

TOMLOV DM602 Pro Digital Microscope
TOMLOV DM602 Pro 10.1″ HDMI Digital Microscope 2000x, Pro Boom Arm Stand, LCD Soldering Microscope with 3 Lens, Adults Microscope for Electronics Repair, Coin Microscope Ring Light,PC Compatible, 64G notes

Riden RD6006 Bench Power Supply
RD6018 RD6018W USB WiFi Digital Control Power Supply DC to DC Voltage Step Down Module Buck Converter Voltmeter 60V 18A notes

OWON XDM1041 Bench Multimeter
Owon XDM1041/XDM1241 Digital Multimeter 55000 Counts High Accuracy Desktop Multimeters AC/DC Tester True RMS USB Multimeter notes

ANENG AN-999S Bench Multimeter
ANENG AN-999S Desktop Voice Multimeter Digital 19999 Counts Professional Bluetooth Tester True RMS AC/DC Voltmeter Current Tools notes

Hakko CHP 3C-SA Precision Tweezers
Hakko CHP 3C-SA Stainless Steel Non-Magnetic Precision Tweezers with Very Fine Point Tips for Microelectronics Applications, 4-1/4″ Length (5 Pack) notes

Miniware DT71 Digital Tweezers
Miniware DT71 Mini Digital Tweezers Smart SMD LCRDVF Tester Multimeter Signal Generator for Measuring Components notes

FNIRSI DSO-TC3 Component Tester
FNIRSI DSO-TC3 Digital Oscilloscope Transistor Tester 10MS/s Sampling Rate 500kHz Bandwidth Support Diode LCR Detect Signal Generator notes

Brother P-Touch D210 Label Maker
Brother P-Touch D210 Handheld Label Maker TZe 3.5mm 6mm 9mm 12mm with Free Tape notes

UNI-T UT116A Digital Tweezers
UNI-T UT116A Digital Tweezers Smart SMD Tester Electrical Multimeter Resistance Capacitance Continuity Diode Test Meter notes

nmsafety Gloves
24Pieces/12 Pairs Work Gloves For PU Palm Coating Safety Protective Glove Nitrile Professional Safety Suppliers

Color: PU1350NV -DMF


Kaisi Repair Mat
Kaisi Heat Insulation Silicone Repair Mat with Scale Ruler and Screw Position for Soldering Iron, Phone and Computer Repair Size:17.7 x 11.8 Inches notes

Kaisi Repair Mat
Kaisi Heat Insulation Silicone Repair Mat with Scale Ruler and Screw Position for Soldering Iron, Phone and Computer Repair Size: 13.7 x 9.8 Inches notes

MMOBIEL Helping Hands
LED Light Helping Hand Magnifier Station for Soldering, Assembly, Repair,Modeling, Hobbies and Crafts – 2.5X /4X LED Light – Hands-Free Magnifying Glass Stand – Incl. Clamp and Alligator Clips notes

QWORK Helping Hands
QWORK Glass Stand notes

Legion Tools Mini Screwdriver Set
Precision Mini Screwdriver Set 11pc Jeweller Laptop Phone Watch Repair Tool notes

Kaisi Soldering Tools w/ Desoldering Pump
Kaisi Professional Solder Auxiliary Tool 6 piece double-sided repair tool with Desoldering Wick & Desoldering Pump notes

Craft Knife Set
Precision Craft Knife Set 52pcs Professional Razor Sharp Knives for Art, Hobby notes

Sudake SDK07 test clips
10X Universal Chip clamp micro IC clamp SOP SOIC TSOP MSOP SSOP SMD IC Test Clip pin Socket Adpter Programmer for logic analyzer notes

Sudake SDK08 test clips
10pcs x Universal Chip IC clamp SOP SOIC TSOP MSOP SSOP SMD IC Test Clip Socket Adpter Programmer for logic analyzer notes

Magnetic/Claw Pickup Tool
Magnetic Pick Up Tool LED Light Magnet 4 Claw Flexible Telescopic Grabber 62cm notes

‎SWANLAKE Telescopic Magnetic Pick Up Tool
Telescopic Magnetic Pick Up & Swivel Inspection Mirror Set Round, Round Mirror Pen Style Magnet Auto Hand Tools notes

‎SWANLAKE Telescopic Swivel Inspection Mirror
Telescopic Magnetic Pick Up & Swivel Inspection Mirror Set Round, Round Mirror Pen Style Magnet Auto Hand Tools notes

Digital meter
Digital Voltmeter Ammeter DC 100V 10A Amp Voltage Current Meter Tester 0.28 Inch Dual LED Display Panel with Connect Wires

Telescopic magnet
1pc 8lb Orange Red Handle Magnetic Pickup Stainless Steel Antenna Retractable Suction Iron Rod Strong Magnetic Suction Rod Tools

Dismantling tools
22 In 1 Multifunctional Disassembly Tool Mobile Phone iPad Laptop Screwdriver Maintenance Kit Repair Tools Opening Set For Hand

Telescopic Magnetic Pickup w/ Light
Telescopic Pickup Magnetic Iron Rod Household Automotive Repair And Inspection Tool Strong Magnetic Metal Screw Suction Rod

Knife blades
100/50pcs Knife DIY Wood Carving Fruit Food Scalpel Craft Sculpture Cutting Tool Metal Engraving Blades Knifes Wood Carving Disc

Multifunction Hooks
4Pcs 160mm Car Auto Vehicle Oil Seal Screwdrivers Set O Ring Gasket Puller Remover Pick Hooks Multifunction Tools

Spudger set
5PCs Car Audio Trim Removal Tool Kit Anti-Scratch Pry Applicable Car Door Panel and Audio Dashboard

IC Chip Pickup Tool
IC Chip Pickup Tools Pen Extractor Electronic Parts Gripper Electronic Repair Tools

Metal spudgers
6PCS Metal Crowbar with Two Ends Universal Mobile Phone Digital Home Appliance Product Dismantling Stick Shell Opening Tool

Victorinox Swiss Champ Red Swiss Army Knife

Scotch Titanium Scissors
3M Scotch Precision Ultra Edge Titanium 8″ Scissors Stay Sharp Smooth Cutting notes

DT830B Digital Multimeter
DT830B AC/DC LCD Digital Multimeter 750/1000V Voltmeter Ammeter Ohm Tester High Safety Handheld Meter Digital Multimeter notes