Category Archives: Design

Learning the Art of Electronics: 1W.1 Designing an Ammeter | In The Lab With Jay Jay

Posted on by
Reply

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: Electronics Guy. I am the Electronics Guy!

In this video we continue working our way through Learning the Art of Electronics and begin working through 1W Worked Examples: DC circuits. Particularly we design and implement the 1A ammeter. Next week we will do the voltmeter.

I measure the internal resistances of my various analog meters, which comes out like this:

Meter Resistance (Ω)
100 µA 2,271
1 mA 239
10 mA 27
100 mA 7
1 A 2
5 V 4,916
10 V 9,150
15 V 13,010

We use the METCAL PS-900 Soldering Station to solder our 222 mΩ resistor.

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

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

We use the Riden RD6006 Bench Power Supply to provide test voltages and currents.

We use the EEVblog BM2257 Digital Multimeter to measure various things, particularly resistance.

We use the Sharp EL-546L Scientific Calculator to crunch a few numbers.

We use the Carpenter Mechanical Pencil to make notes.

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

We use the Plato Model 170 Wire Cutter to trim 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! :)

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!

MECHANIC UV Curing LightThis is an image of the product.notes

Let’s go shopping!

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

Posted on by
Reply

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: 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.

Let’s go shopping!

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

Posted on by
Reply

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.

Let’s go shopping!

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

Posted on by
Reply

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

Let’s go shopping!

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

Posted on by
Reply

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

Let’s go shopping!