I have a new post on Hackaday: Germanium Semiconductor Made Superconductor By Gallium Doping.
Germanium Semiconductor Made Superconductor By Gallium Doping
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Category Archives: Writing
Maker Advent Calendar 2025 #3: Bashing Buttons! | 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: Earth Grounder. I am the Earth Grounder!
In this video we do the third project from The 12 Projects of Codemas.
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!
Allsome QR040 Clamp |
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Maker Advent Calendar 2025 #2: Let’s Get Blinky! | Learning Electronics In The Lab With Jay Jay
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 do the second project from The 12 Projects of Codemas.
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 Macropad 3-Key Mechanical Keyboard |
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Taking Electronics To A Different Level
I have a new post on Hackaday: Taking Electronics To A Different Level.
The Slow Motion Sunrise-Sunset Light | Project 8/30 | Maxitronix 30in1 | In The Lab With Jay Jay
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: 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.
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 8pcs Flexible Glue Remover Spudgers |
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Learning the Art of Electronics: 1L.4.2 10 V Voltmeter | In The Lab With Jay Jay
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: Bolt Boy. I am the Bolt Boy!
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 make an 10 V voltmeter with our meter movement.
We use the Riden RD6006 Bench Power Supply to provide test voltage and current.
We use the EEVblog BM2257 Digital Multimeter to measure voltage and current.
We use the Sharp EL-546L Scientific Calculator to do our calculations.
We use the Multicomp Pro MP701033 Resistor Decade Box as our resistor.
We use the WilliamKlein Music Stand to hold our textbook.
We use the Carpenter Mechanical Pencil to make our notes.
We use the Hakko CHP 3C-SA Precision Tweezers for tweezering.
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 6pcs Wire Brush notes |
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The Sunrise-Sunset Light | Project 7/30 | Maxitronix 30in1 | In The Lab With Jay Jay
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: 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 Tool |
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What Happens When You Pump 30,000 Watts Into A Tungsten Incandescent Light Bulb?
I have a new post on Hackaday: What Happens When You Pump 30,000 Watts Into A Tungsten Incandescent Light Bulb?
Interlude #18: Measuring Forward Voltage of LEDs of Various Colours | In The Lab With Jay Jay
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.
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 Meter |
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Learning the Art of Electronics: 1L.4.1 Internal resistance of the movement | In The Lab
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:
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 Multimeter |
Let’s go shopping!