#722 Mailbag Monday 8th June 2020

0:00 - Intro
3:30 - 33uF 40V Electrolytic Capacitors (no link).
5:50 - 6N136 Opto Coupler (no link).
14:45 - Out takes.
14:56 - An idiot in their natural habitat trying to figure out how something works.

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==========================================
Some Of My Electronics Tools (video and purchase links)
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Boonton
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4220.

Fluke
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8842A:
5450A.
893A.
A90.

HP/Agilent/Keysight
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5005A.

Marconi
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2022D.

Rohde & Schwarz
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Siglent
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SPL-1008.

Other Equipment
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Heathkit IT-12 Signal Tracer.

Handheld Equipment
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[goglu]

Just trying to help the push button monkey :D
1. Connect work voltage DC 5V~12V from white XH2.54-2P socket or install a 18650 battery at left battery socket.
2. Install a measured 18650 battery at right battery socket.
3. Turn on power supply switch. Then the screen will display current battery voltage.
4. Set discharge stop voltage.Press button + and - to set discharge stop voltage.Parameters can be saved automatically.It is recommended that the 18650 battery stop discharge voltage be set to 3.5V.
5. Short press the first(left) button to start measuring.Then the LED indicator D3 will turn ON.
6. Short press the second button to switch dispaly capacity(mAh), energy(mWh) and voltage.
7. Long press first(left) button to clear dispaly capacity(mAh) and energy(mWh).
8. The battery is tested and shows the battery test value when D3 LED indicator start blinking.

[GadgetReboot]

I also saw those mini grabbers somewhere and wanted to order them but I can’t remember where I saw it either, maybe pile of stuff.

[davidv]

Thanks for the video, Scott. You could de-solder the resistor, move it to the back of the PCB and stick on a heat sink. Then you'd probably have to 3D print a holder! Maybe more work than it's worth.

[daveodessa]

Great video as usual Scott. The 18650 Battery Capacity Tester looks interesting. Thank god it had no more than four buttons :)

[douro]

The other optocouplers were from Toshiba.

[allthegearnoidea]

Oh I like those small grabber probes. those would have been useful when I was going through my logic analyser fetish. Stay safe regards Chris

[Microwave_Dave]

A bit of red electrical tape over the LED display of your battery tester will help greatly with readability.

[IanScottJohnston]

The 18650 battery tester intrigued me, I could use I saw it in operation, what a rubbish user interface. Some English on the buttons, better use of the 7-seg display and maybe a few status LED's wouldn't go amiss. Oh dear!!!

[deankqadj]

Also check out Simple Electronics and Learn Electronics, all are fantastic channels.

[deankqadj]

Pile of Stuff and Gadget Reboot are both fantastic channels, check them out if you haven't yet.