Author Archives: Jay Jay

About Jay Jay

Hi there. My name is John Elliot V. My friends call me Jay Jay. I talk about technology on my blog at blog.jj5.net and make videos about electronics on my YouTube channel @InTheLabWithJayJay.

The Sunrise-Sunset Light | Project 7/30 | Maxitronix 30in1 | 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: Systems Architect. I am the Systems Architect!

In this video we continue to work through our Maxitronix 30in1, today doing project #7: The Sunrise-Sunset Light. In this project we see how an electrolytic capacitor can control and NPN transistor. By varying the resistor and capacitor we can change the timings of the circuit.

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

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 IC Extractor Claw IC Chip Pickup ToolThis is an image of the product.

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Interlude #18: Measuring Forward Voltage of LEDs of Various Colours | 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: …

In this video we use our Peak Electronic Design Atlas DCA75 Pro Semiconductor Analyzer to measure the forward voltage of ten different LEDs which I keep in stock.

In the following table the values are computed for VS = 5V and I = 20mA.

Size Colour VF VR RS
10mm RED 1.890 3.110 156
10mm GREEN 2.030 2.970 149
10mm BLUE 2.643 2.357 118
10mm YELLOW 1.939 3.061 153
10mm WHITE 2.615 2.385 119
5mm RED 1.889 3.111 156
5mm GREEN 1.995 3.005 150
5mm BLUE 2.710 2.290 115
5mm YELLOW 2.019 2.981 149
5mm WHITE 2.775 2.225 111
VS
Supply voltage, e.g. 5 V.
I
Desired LED current in milliamps, e.g. 20 mA.
VF
Forward voltage, as measured; e.g. 1.8 V.
VR
Voltage across resistor = VS – VF.
RS
Series resistance to use, in Ohms = VR / I.

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 13-in-1 Multi-function Digital Display USB Voltage Current Power MeterThis is an image of the product.

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Learning the Art of Electronics: 1L.4.1 Internal resistance of the movement | In The Lab

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

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

Silly Job Title: Tech Lead. I am the Tech Lead!

In this video we continue to work our way through Learning the Art of Electronics. In this video we continue with 1L Lab: DC Circuits and measure the internal resistance of our meter movement.

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

We use the Pro’sKit SS-331H Desoldering Pump to desolder (unsuccessfully).

We use the Riden RD6006 Bench Power Supply to provide 1V power for testing.

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

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

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

We use the Sharp EL-546L Scientific Calculator to calculate our values.

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

We use the Multicomp Pro MP701033 Resistor Decade Box to provide test resistances.

We use the WilliamKlein Music Stand to hold our textbook.

We use the Carpenter Mechanical Pencil to take notes.

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

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

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

The circuit I make in this video for interfacing the meter movement is JJ001:

Photo of circuit JJ001

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!

Fluke 17B+ Digital MultimeterThis is an image of the product.

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Module Monday #9: HW-103 Water Level Sensor Module | 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.

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

Silly Job Title: Wire Whisperer. I am the Wire Whisperer!

Today is Module Monday.

In this video we take a look at the Smart Electronics Soil Moisture Hygrometer Detection Humidity Sensor Module For arduino Development Board DIY Robot Smart Car.

The code for this Arduino sketch is here: 2025-12-01-HW-103-Water-Level.ino.

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

We use the Yizhan Digital Microscope to take a close look at our module.

We use the ElectroCookie PCB Prototype Solderable Breadboard to make our LED traffic lights circuit.

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

We use the Plato Model 170 Wire Cutter as a wire cutter.

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

Errata: at t=22:58 I say I need smaller “capacitors” but what I meant is smaller “resistors”.

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 16MP USB CameraThis is an image of the product.

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Cheatsheet #2: Elementary Algebra QuickStudy | 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.

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

Silly Job Title: Tome Pumper. I am the Tome Pumper!

In this video we work through our next QuickStudy cheatsheet: Elementary Algebra.

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 Probe TweezersThis is an image of the product.notes

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Electronics Project #23: Banana Plug Into Hook-Clips | 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.

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

Silly Job Title: Watt Wizard. I am the Watt Wizard!

In this video we make six cables: connecting banana plugs to hook clips. In order to do this we cut three banana plug cables in half and solder on hook clips to each half, leaving us with six cables.

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

We use the EEVblog BM2257 Digital Multimeter for continuity testing.

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

We use the Plato Model 170 Wire Cutter to 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!

Maxitronix 500in1 Electronics Project Lab KitThis is an image of the product.notes

Let’s go shopping!