Author Topic: [YouTube] 8-bit Guy epic fail  (Read 8731 times)

0 Members and 1 Guest are viewing this topic.

Offline metrologist

  • Super Contributor
  • ***
  • Posts: 1802
  • Country: 00
Re: [YouTube] 8-bit Guy epic fail
« Reply #25 on: May 08, 2017, 07:43:59 pm »
You guys fooled me, I thought you were talking about this guy, and was ready to straighten you out that the 8-bit guy is someone different... Yeah, he's wen't a bit off his normal content paradigm, like taking his Chevy Volt to the drag strip...LoL


[youtube]F9IVtKa8C7Q[/youtube]
 

Offline tooki

  • Super Contributor
  • ***
  • Posts: 4260
  • Country: ch
Re: [YouTube] 8-bit Guy epic fail
« Reply #26 on: May 09, 2017, 01:40:49 pm »
You guys fooled me, I thought you were talking about this guy, and was ready to straighten you out that the 8-bit guy is someone different... Yeah, he's wen't a bit off his normal content paradigm, like taking his Chevy Volt to the drag strip...LoL


[youtube]F9IVtKa8C7Q[/youtube]


 

Offline P90

  • Frequent Contributor
  • **
  • Posts: 646
Re: [YouTube] 8-bit Guy epic fail
« Reply #27 on: May 18, 2017, 02:48:24 pm »
You guys fooled me, I thought you were talking about this guy, and was ready to straighten you out that the 8-bit guy is someone different... Yeah, he's wen't a bit off his normal content paradigm, like taking his Chevy Volt to the drag strip...LoL


[youtube]F9IVtKa8C7Q[/youtube]


he's wen't ?

what the hell does that mean? LOL
 

Offline metrologist

  • Super Contributor
  • ***
  • Posts: 1802
  • Country: 00
Re: [YouTube] 8-bit Guy epic fail
« Reply #28 on: May 18, 2017, 05:12:07 pm »
he's wen't ?

what the hell does that mean? LOL

It means I was thinking of typing he's gone... and ended up not completing the transition to he went; and I think I had a few more ideas that got mixed into the editing.
 

Offline janoc

  • Super Contributor
  • ***
  • Posts: 2955
  • Country: fr
Re: [YouTube] 8-bit Guy epic fail
« Reply #29 on: May 18, 2017, 10:26:53 pm »
1.Oh my god, it's not 5V either end, a floating power supply could have tens or over a hundred volts floating upon contact with another power supply if the two power supply are isolated for some time.


:palm:

You do realize that when those two (isolated, floating) supplies are connected by only a single wire, then regardless of any hypothetical potential difference no current could flow and thus no damage to occur?

Or rather the only current would be due to leakage through the Y capacitor in the Apple supply, which would be very tiny (otherwise you would could get electrocuted). The C64 supply is linear, fully isolated with a transformer and no suppression caps, so unless the trafo is defective, no leakage current across it. So such current would have nowhere to go.

And once he reconnected the grounds, there was no more chance for hundreds of volts anywhere, because the two supplies stopped floating relative to each other.

The only thing that Apple charger could have potentially caused, depending on the C64 power supply design, is that the 7805 regulator in it could die because it has been back powered (he turned on the display power before powering up the computer).

However, that was unlikely the issue because he had problems even before he was playing with the displays and chargers (you didn't watch the entire video, did you?).

And yes, voltage regulators do die. I had that happen in a power supply for my ZX Spectrum clone - also a 7805. Those 8bit computers took quite a bit of current and it was common that these regulators ran hot (in my case regulating from 12V down to 5V, so some 6W power loss) and were dying from time to time.

Also Dave has a repair video or two where he is replacing blown regulators.

2.He used a newer model on the second try, it may have some bleed mechanism to deal with the floating voltage, or he connected the LCD before connecting the Apple charger, which could also solve the floating problem.

That "floating problem" is a complete red herring.
« Last Edit: May 18, 2017, 10:35:39 pm by janoc »
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf