Unpotted unit. Let's reverse engineer it
Added 2021-05-15 19:13:08 +0000 UTCThis smaller vehicle-version of a recent item I explored, has an unpotted high voltage section.
Perfect for further exploration.
Comments
I really don't like the crowd that is anti Potter. Harry is just a nice guy that likes to save the world.
Jason Greene
2021-05-19 15:34:41 +0000 UTCLOL guys...I meant making the noise with your mouth...for fun! I'm very sorry! I have trouble making myself clear these days sometimes.
Michael Thompson
2021-05-18 07:10:19 +0000 UTCThe BOING noise was an issue for a while with the current recording device being a bit zealous in its automatic gain control. It disappeared with an update.
Big Clive
2021-05-18 01:47:32 +0000 UTCMade in China, but seems to be linked to a couple of UK brands as Puremate and Heaven Fresh.
Big Clive
2021-05-18 01:46:23 +0000 UTCThe resistor that turned green looks like a carbon film resistor if heated too much they have the tendency to turn green well the tolerance band does.
Jonathan Hughes
2021-05-17 22:56:26 +0000 UTCThe microphone vibrating or the device vibrate motor running as the screen is tapped? Also Clive, where does one get one of these units, or are they a local sols product (to UK)
Anton
2021-05-17 11:58:50 +0000 UTCKeep in mind that at higher currents the diodes do run quite hot. There is a MOSFET trick for reverse polarity protection.
Big Clive
2021-05-17 04:38:27 +0000 UTCOr finding the final stage just wasn't needed.
Big Clive
2021-05-17 04:37:33 +0000 UTCHigh-end insulation testers feature a Guard terminal. Its purpose is to collect leakage that's not of interest to the measurement being made. It's maintained at the same potential as the negative terminal (more or less, it can matter how good this is). Say you wanted to measure the resistance between two cores of an armoured cable. You might connect the guard to the armour. It collects current leaking from the positive to the sheath, but does not include the current in the resistance calculation. Which is all strictly for the birds when you're talking about a £20 tester that doesn't even claim 61557 or have PI/DAR, and is apparently poorly designed. The presence of a Guard terminal is just showmanship.
Mike Page
2021-05-16 18:34:05 +0000 UTC1N5401 is rated at 3 amps
2021-05-16 15:54:50 +0000 UTCDoes any else make a "boi-oi-oing" noises on the jump cuts? Maybe that's a generation thing. (54)
Michael Thompson
2021-05-16 09:26:19 +0000 UTCI meant to specify a what would be a good reverse polarity protection diode?
Louboxington
2021-05-16 08:56:42 +0000 UTCWhat would beva good diode to use for an 18v 1 - 2 amp circuit?
Louboxington
2021-05-16 08:55:56 +0000 UTCI've got one of those here, but stalled on making a video about it because I couldn't work out the purpose of the middle terminal either.
Big Clive
2021-05-16 03:08:31 +0000 UTCOh, just doubting their own design? Or, perhaps, which components they could get?
nowt
2021-05-16 02:56:33 +0000 UTCI think it's just a backup option in case the voltage was too low.
Big Clive
2021-05-16 02:54:16 +0000 UTCEven the silver 0.1 multiplier has turned green.
Big Clive
2021-05-16 02:53:49 +0000 UTCCould the extra capacitor and diode stage be for a USB powered version?
nowt
2021-05-15 22:03:39 +0000 UTCGreen tolerance band is ±0.5%, but I'm not sure why they'd go with that here (and you'd expect more digits in that case...).
2021-05-15 20:15:44 +0000 UTCSpeaking of high voltage fun did you see the lastest "TheHWCave"? He looks a slighly sketchy mega ohm meter; there a few fun ways you can zap yourself. https://www.youtube.com/watch?v=rE7tlQvZQqY
Peter Stevens
2021-05-15 19:44:13 +0000 UTCBut that means no x-ray hammer :(
adrian
2021-05-15 19:32:53 +0000 UTCFantastic! Press onward Clive!
Michael Thompson
2021-05-15 19:16:49 +0000 UTC
