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Here's the video about the mechanics version of a logic probe.

It can indicate polarity of 12V circuits, and forcibly change their state with internal short circuit protection and warning.

But do NOT use on lower voltage sensor circuits not operating at 12V.

Let me know if you think the components I mentioned could be omitted.

https://www.youtube.com/watch?v=sa06Y7HYzoc

Files

Inside a mechanic's test probe - with schematic

A very simple, but extremely useful 6-24V test probe that can detect polarity and force energise circuitry in either polarity with the press of a button. It's basically a logic probe for cars and trucks. The circuitry is refreshingly simple, with just one oddity. This test probe is widely available on eBay. Target price is around 20. If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- http://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators

Comments

Raven Luni

Nice. I've been interested in these devices since watching people using them in arcade repair videos - currently working on designing my own with some 'custom features'.

George Cohn

Interesting that you can use it on positive or negative ground. My 64 Jaguar e-type was positive ground as were many Brit cars of the era. I believe they switched to negative ground in 1965. My 70 Jaguar e-type is definitely negative ground or "earth" as you folks say. Can't remember when they went from 6 volts to 12 volts though.

bigclive

The ones in many arcade repair videos are classic logic probes for operating at 5V. Some arcade PCBs even had them built onto the board.