Category Archives: Science

Maker Advent Calendar 2025 #11: OMG OLED! | Learning Electronics In The Lab With Jay Jay

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Silly Job Title: Operation Manager. I am the Operation Manager!

In this video we do the eleventh project from The 12 Projects of Codemas.

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Yum Cha Corner CutterThis is an image of the product.

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Maker Advent Calendar 2025 #4: Amazing Analog! | Learning Electronics In The Lab With Jay Jay

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Silly Job Title: Maker of Videos. I am the Maker of Videos!

In this video we do the fourth project from The 12 Projects of Codemas.

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FNIRSI DC580 Power ModuleThis is an image of the product.

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Maker Advent Calendar 2025 #2: Let’s Get Blinky! | Learning Electronics In The Lab With Jay Jay

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

In this video we do the second project from The 12 Projects of Codemas.

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Yum Cha Macropad 3-Key Mechanical KeyboardThis is an image of the product.

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New Book Teardown #8: Electricity and Magnetism 3rd Edition (2013) | In The Lab With Jay Jay

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Silly Job Title: Ohm Oracle. I am the Ohm Oracle!

In this video we take a look inside Electricity and Magnetism 3ed.

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The Slow Motion Sunrise-Sunset Light | Project 8/30 | Maxitronix 30in1 | In The Lab With Jay Jay

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Silly Job Title: Grounding Genius. I am the Grounding Genius!

In this video we continue to work through our Maxitronix 30in1, today doing project #8: The Slow Motion Sunrise-Sunset Light. In this project we see how an electrolytic capacitor can control a Darlington pair.

We use the UNI-T UTi260B Thermal Imager to examine the thermal properties of the circuit (there’s not much to see).

We use the OWON XDM1041 Bench Multimeter for voltage and current measurements.

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

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Yum Cha 8pcs Flexible Glue Remover SpudgersThis 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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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.

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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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