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:

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.

Let’s go shopping!

Old Book Teardown #20: Encyclopedia of Electronic Circuits Volume 7 (1999) | 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: Charge Changer. I am the Charge Changer!

In this video we take a look inside Encyclopedia of Electronic Circuits Volume 7 by Rudolf F. Graf and William Sheets.

Some circuits of interest included:

Page Circuit
385 DTMF Infrared Transmitter
524 FET Tester
916 Electronic Parrot
925 Voice-Effects Simulator Circuit

And some new terms that we learned were:

  • VFO: Variable-Frequency Oscillator
  • LM3914, LED Driver, similar to LM3915 and LM3916
  • MMIC: Monolithic Microwave Integrated Circuit
  • Balun: balanced to unbalanced; balancing unit
  • NE602: signal processing IC

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 29 In 1 Mini Precision Screwdriver SetThis is an image of the product.notes

Let’s go shopping!

Old Book Teardown #19: Encyclopedia of Electronic Circuits Volume 6 (1995) | 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: Technical Director. I am the Technical Director!

In this video we take a look inside Encyclopedia of Electronic Circuits Volume 6 by Rudolf F. Graf and William Sheets.

Some circuits of interest included:

Page Circuit
387 Heartbeat Transducer
531 Geiger Counter
663 FM Bug

And some new terms that we learned were:

  • AGC: Automatic Gain Control
  • ALC: Automatic Level Control
  • IF: Intermediate Frequency
  • He: Helium
  • Ne: Neon

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 TE-801 Third HandThis is an image of the product.notes

Let’s go shopping!

Mail Call #52: Maker Advent Calendar, Banana Cables, Test Probes, Brushes and More! | 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: Fixeruperer. I am the Fixeruperer!

In this video we take a look at what arrived in the mail from AliExpress, Amazon, and The Pi Hut:

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 PullerThis is an image of the product.

Let’s go shopping!

Learning the Art of Electronics: 1L.2.4.1 Measure Your DVM’s current output in diode test mode | 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: Wattage Warlock. I am the Wattage Warlock!

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 our DVM’s current output in diode test mode.

We use the Fluke 17B+ Digital Multimeter for voltage and current measurements.

We use the EEVblog BM2257 Digital Multimeter for voltage and current measurements.

We use the Carpenter Mechanical Pencil to take notes.

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 9 in 1 Air Quality MeterThis is an image of the product.

Let’s go shopping!

Old Book Teardown #18: Encyclopedia of Electronic Circuits Volume 5 (1994) | 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: Switch Switcher. I am the Switch Switcher!

In this video we take a look inside Encyclopedia of Electronic Circuits Volume 5 by Rudolf F. Graf and William Sheets.

Some circuits of interest included:

Page Circuit
150 Bug Detector
224 IR Pulse Audio
256 Simple Lie Detector
257 Chapter 49: Light Comms
326 Voice Disguiser
373 Chapter 61: Moisture and Fluid Detectors
554 Speech Scrambler
556 Chapter 93: Sound Effects

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!

Yizhan Digital MicroscopeThis is an image of the product.notes

Let’s go shopping!

Old Book Teardown #17: Encyclopedia of Electronic Circuits Volume 4 (1992) | 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: Capacitor Captain. I am the Capacitor Captain!

In this video we take a look inside Encyclopedia of Electronic Circuits Volume 4 by Rudolf F. Graf and William Sheets.

We noted while going through the book that πP is short for “microprocessor”, or, essentially what we’d just call a CPU these days.

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!

Learning the Art of Electronics: Fig-1N.33: Circuit A Drives Circuit B | In The Lab With Jay Jay

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: Component Wrangler. I am the Component Wrangler!

In this video we continue to work our way through Learning the Art of Electronics. We have nearly finished the 1N DC Circuits chapter. Today we learned a new rule of thumb: when circuit A drives circuit B the output impedance of circuit A should be equal to or less than 10% of the input impedance of circuit B.

There is no prac this week, only theory. Next week we will complete this chapter and then we’re ready to proceed into our first lab chapter.

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 13MP HD Webcam With Mic USB CameraThis is an image of the product.

Let’s go shopping!