Category Archives: Design

Electronics Project #28: Space Drop Power Subsystem | Learning Electronics In The Lab With Jay Jay

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This post is part of my video blog and you can find more information about this video.

Silly Job Title: Electron Ambassador. I am the Electron Ambassador!

In this video we figure out how the power subsystem from the Space Drop circuit works. I’m a little confused in the beginning but by the end I understand how it works. The documentation for the circuit we build is here: JJ005.

We use the METCAL PS-900 Soldering Station for soldering.

We use the AiXun H314 Hot Air Gun for heat shrinking.

We use the MUIN Solder Fume Extractor to clear the air.

We use the EEVblog BM2257 Digital Multimeter for continuity testing.

We use the Brother P-Touch D210 Label Maker to label our JJ005 circuit.

We use the Bysameyee Head-Mounted Magnifier for magnification while soldering.

We use the ElectroCookie PCB Prototype Solderable Breadboard to build our circuit on.

We use the Hakko CHP 3C-SA Precision Tweezers for tweezering.

We use the Plato Model 170 Wire Cutter to trim component leads and cut wire.

We use the Kaisi S-160 45x30cm Repair Mat as our workspace.

Thanks very much for watching! And please remember to hit like and subscribe! :)

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Yum Cha 15 Pcs SandpaperThis is an image of the product.

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Electronics Project #27: Space Drop Handheld Game | Learning Electronics In The Lab With Jay Jay

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You can support this channel on Patreon: patreon.com/JohnElliotV

This post is part of my video blog and you can find more information about this video.

Silly Job Title: Current Curator. I am the Current Curator!

In this video we follow the instructions to build the Space Drop handheld computer game which you can buy in kit form from here: Space Drop Solder Kit.

The kit comes with the software preinstalled on the D1 Mini microcontroller, but in this video we replace the code with our own version of the code just to see if we could. And we could! Our code is here: Space_Drop.ino.

We use the METCAL PS-900 Soldering Station for soldering.

We use the Pro’sKit SS-331H Desoldering Pump to remove the OLED screen which I accidentally installed without the spacer.

We use the MUIN Solder Fume Extractor to clear the air.

We use the Bysameyee Head-Mounted Magnifier for magnification.

We use the Scotch Titanium Scissors to chop up the packaging for scrap-booking.

We use the Hakko CHP 3C-SA Precision Tweezers for holding solder off cuts.

We use the Plato Model 170 Wire Cutter to snip off component leads.

We use the Kaisi S-160 45x30cm Repair Mat as our workspace.

Thanks very much for watching! And please remember to hit like and subscribe! :)

p.s. today I added OLED to my spell check.

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

DUTRIEUX 14pcs Hexagonal Socket SetThis is an image of the product.

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Module Monday #10: HW-390 Soil Moisture Sensor Module | In The Lab With Jay Jay

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You can support this channel on Patreon: patreon.com/JohnElliotV

This post is part of my video blog and you can find more information about this video.

Silly Job Title: Sparky. I am Sparky!

Today is Module Monday and the module we’re looking at today is the HW-390 Soil Moisture Sensor Module. This is a capacitive sensor which is different to the two previous moisture sensors which were resistive.

The code for today’s demo is here: 2026-04-20-HW-390-Capacitive-Soil-Moisture.ino.

We use the Rigol MSO5074 Mixed Signal Oscilloscope to look for a waveform (there was none).

We use the EEVblog BM2257 Digital Multimeter to measure voltage and resistance.

We use the Kaisi S-160 45x30cm Repair Mat as our workspace.

Thanks very much for watching! And please remember to hit like and subscribe! :)

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Yum Cha 4pcs 30mm Deep Hole PenThis is an image of the product.notes

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Music from a Pencil | Project 12/30 | Maxitronix 30in1 | In The Lab With Jay Jay

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You can support this channel on Patreon: patreon.com/JohnElliotV

This post is part of my video blog and you can find more information about this video.

Silly Job Title: Energy Maestro. I am the Energy Maestro!

In this video we do the 12th project from the Maxitronix 30in1 Electronics Project Lab Kit: Music from a Pencil.

We use the Rigol MSO5074 Mixed Signal Oscilloscope to investigate our oscillator’s waveform.

We use the METCAL PS-900 Soldering Station to solder our cables to the alligator clips.

We use the MUIN Solder Fume Extractor to clear the air.

We use the EEVblog BM2257 Digital Multimeter to measure resistance.

We use the Multicomp Pro MP701033 Resistor Decade Box as a variable resistor.

We use the Carpenter Mechanical Pencil to draw our pencil resistor.

We use the Plato Model 170 Wire Cutter to cut our cables.

We use the Kaisi S-160 45x30cm Repair Mat as our workspace.

Thanks very much for watching! And please remember to hit like and subscribe! :)

p.s. today I added MUIN to my spell check.

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Yum Cha 6pcs Wire BrushThis is an image of the product.notes

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Learning the Art of Electronics: 1S Supplementary Notes: Investigating Thevenin equivalent of voltage divider | In The Lab

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You can support this channel on Patreon: patreon.com/JohnElliotV

This post is part of my video blog and you can find more information about this video.

Silly Job Title: Luminary Luminar. I am the Luminary Luminar!

In this video we continue to work our way through Learning the Art of Electronics. In this video we finish 1S Supplementary Notes: Resistors, Voltage, Current and do Exercise 1.10 from The Art of Electronics which has us investigating a voltage divider.

In this video I recommend to you the book Schaum’s Outline of Basic Circuit Analysis, 2nd Edition and Gary Tuttle’s website gtuttle.net where you can find Thevenin & Norton practice problems.

We use the METCAL PS-900 Soldering Station for soldering.

We use the AiXun H314 Hot Air Gun for heat shrinking.

We use the Pro’sKit SS-331H Desoldering Pump to fix up some of our mistakes.

We use the Tenma 72-10505 Bench Power Supply to provide 15 and 30 V DC to our circuits.

We use the EEVblog BM2257 Digital Multimeter to measure voltage.

We use the Fluke 17B+ Digital Multimeter to measure current.

We use eight of the cheapo Yum Cha DT830B Digital Multimeters as ammeters and voltmeters.

We use the Brother P-Touch D210 Label Maker to label our circuit.

We use the Sharp EL-546L Scientific Calculator to do some basic calculations.

We use the Bysameyee Head-Mounted Magnifier to light up our life.

We use the nmsafety Nitrile Gloves to protect our fingers.

We use the ElectroCookie PCB Prototype Solderable Breadboard to make our circuit on.

We use the WilliamKlein Music Stand to hold our tome.

We use the Scotch Titanium Scissors to snip, snip, snip.

We use the Hakko CHP 3C-SA Precision Tweezers for tweezering.

We use the Plato Model 170 Wire Cutter to cut, cut, cut.

We use the Kaisi S-160 45x30cm Repair Mat as our workspace.

Thanks very much for watching! And please remember to hit like and subscribe! :)

p.s. today I added Luminar, Pro’sKit, Desoldering, Tenma, Yum Cha, Multimeters, Bysameyee, nmsafety, ElectroCookie, Solderable, WilliamKlein, and Hakko to my spell check.

Following is a product I use picked at random from my collection which may appear in my videos. Clicking through on this to find and click on the green affiliate links before purchasing from eBay or AliExpress is a great way to support the channel at no cost to you. Thanks!

Yum Cha 10pcs Glue Removal Razor BladesThis is an image of the product.

Let’s go shopping!

The Bang Preventer – aka DIY Current Limiter with isolation transformer

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I asked Tony359 about his current limiter and he referred me to the video below in which he explains his home made contraption. Very cool. I think I should make one of these.

Update: I also found a video covering a similar topic:

The voltmeter used in the second design is this one: Digital AC Voltmeter.

Oh, and here’s another one!