EEVblog

Old component bonanza Mailbag!

Forum HERE

SPOILERS:

TI-74 BASIC pocket computer teardown from 1985

OpenMYR WiFi Motor Kickstarter

Several 4-banger calculators

GEZE automatic roller door controller teardown

E-Book reader teardown and PCB bypassing techniques

Switch & Lever

It’s finally here! The first Solar Roadways installation happened in Sandpoint Idaho after $3.9M in funding and 6.5 years of development. Does it work? Is it practical?

Once again, Dave runs the numbers…

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Dave sketches up an idea for a more integrated Raspberry Pi supercomputer cluster with integrated ethernet and power.

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A viewer found an EMC issue with the Keysight U1272A multimeter

Dave confirms both conducted and coupled issues and finds some spooky action at a distance!

Comparisons with other meters confirm they don’t have the same issue.

Fluke 87 GSM Problem VIDEO

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How does a high voltage differential probe work?

How is it safe?

Is it isolated?

A teardown and some reverse engineering of the Lecroy AP031 25MHz HV Differential probe. a.k.a Sapphire Instruments SI-9001

Forum HERE

Dave takes a look at how to optimise the low burden voltage multimeter design from PART 2 to eliminate some parts.

And explains the µCurrent shunt circuit design and how that applies to this new optimised design.

It’s basically a practical tutorial in circuit design optimisation.

Then another design variation is presented using MOSFET switching that eliminates ones of the HRC fuses and the amplifier, and still lowers the burden voltage yet again!

PART 1 is HERE

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Dave looks at the current measurement front end of a typical multimeter and figures out how to redesign it for lower burden voltage.

It’s not quite as easy as you might think, there are comprimises and traps for your players.

And something you probably didn’t know about HRC fuses.

µCurrent ARTICLE

Multimeter fuse and diode protection VIDEO

Multimeter input protection tutorial VIDEO

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Inside the cheap arse Jaycar SL3467 “Rave” DMX controlled RGB LED disco party lights scored for $1 from the dumpster sale. Did Dave get ripped off?

The annual Jaycar warehouse sale, take it for a buck or it goes in the dumpster!

UPDATE: Yes, all the hard drives work.

Forum HERE

What is an oscilloscope?

What is it useful for?

How is it used?

What is the difference between an old school analog and a modern digital storage oscilloscope?

Rigol DS1054Z is a good basic digital scope

How not to blow up your oscilloscope VIDEO

Mysteries of X1 Oscilloscope Probes Revealed VIDEO

Vertical Confusion VIDEO

AC Trigger Coupling VIDEO

Forum HERE