Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up Try the site in https mode Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

« previous next »
Pages: [1]
  
Go Down

Author Topic: Is 7-volts too much for a 5-volt requirement?  (Read 1936 times)

0 Members and 1 Guest are viewing this topic.

postalp123

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 193
  • Last login:March 18, 2024, 09:07:50 pm
  • Retro-gamers don't just play, they reminisce.
Is 7-volts too much for a 5-volt requirement?
« on: December 12, 2006, 10:55:57 am »
As posted before, I was looking for a power source for my druin board (requires 5-volts).

I managed to find an old AC adapter running 7-volts AC, is this too much for the Druin to handle?

Thanks!
-PP
Logged

ChadTower

  • Chief Kicker - Nobody's perfect, including me. Fantastic body.
  • Trade Count: (+12)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 38212
  • Last login:July 30, 2025, 03:29:53 pm
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #1 on: December 12, 2006, 10:58:15 am »

Depends on the application, really.  No way to answer that without knowing what it's being fed into.  Lots of 5v things get 7-8v in and regulate it down inside.  Lots don't.
Logged

postalp123

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 193
  • Last login:March 18, 2024, 09:07:50 pm
  • Retro-gamers don't just play, they reminisce.
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #2 on: December 12, 2006, 11:02:29 am »
Quote from: ChadTower on December 12, 2006, 10:58:15 am

Depends on the application, really.  No way to answer that without knowing what it's being fed into.  Lots of 5v things get 7-8v in and regulate it down inside.  Lots don't.

For the record heres what I'm powering:
http://ca.geocities.com/druins22@rogers.com/ls30/


Logged

Ed_McCarron

  • Nothing worse than Picard issuing the self destruct order and the next thing you know it your apartment blows up.
  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 2404
  • Last login:June 20, 2022, 02:33:39 pm
  • Get your mind out of the gutter. THIS is a dongle.
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #3 on: December 12, 2006, 11:04:47 am »
Not really familiar with that board, but looking at it I'll make two assumptions:

That theres no regulator, unless theres one built into the chip.  Not likely.

It wants DC, not AC.  That reg won't work regardless of voltage.  Looks like DC in is on the top barrier terminal, and ties right to +5v and gnd.  The electrolytic cap is for filtering.  No regulation/rectification.
Logged
But wasn't it fun to think you won the lottery, just for a second there???

Ed_McCarron

  • Nothing worse than Picard issuing the self destruct order and the next thing you know it your apartment blows up.
  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 2404
  • Last login:June 20, 2022, 02:33:39 pm
  • Get your mind out of the gutter. THIS is a dongle.
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #4 on: December 12, 2006, 11:06:46 am »
Looked at the schematic.

5v DC only.

Can you pull it from a drive connector on the computer you have in there?  I assume this is a MAME app?
Logged
But wasn't it fun to think you won the lottery, just for a second there???

ChadTower

  • Chief Kicker - Nobody's perfect, including me. Fantastic body.
  • Trade Count: (+12)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 38212
  • Last login:July 30, 2025, 03:29:53 pm
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #5 on: December 12, 2006, 11:11:54 am »

If I recognize that chip properly, it's just an eeprom.  No voltage changing whatsoever.
Logged

Havok

  • Keeper of the __Blue_Stars___
  • Trade Count: (+17)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 4531
  • Last login:September 08, 2025, 10:54:14 am
  • Insufficient facts always invite danger.
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #6 on: December 12, 2006, 12:05:09 pm »
Why can't you pull 5v from the computer power supply? I would think that is the best solution. Both the Ipac and Keywiz\GPWiz have a 5v tap for just this thing. Worse case - buy a universal adapter for $10 and wire that up...
Logged

Ed_McCarron

  • Nothing worse than Picard issuing the self destruct order and the next thing you know it your apartment blows up.
  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 2404
  • Last login:June 20, 2022, 02:33:39 pm
  • Get your mind out of the gutter. THIS is a dongle.
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #7 on: December 12, 2006, 12:46:36 pm »
Quote from: ChadTower on December 12, 2006, 11:11:54 am

If I recognize that chip properly, it's just an eeprom.  No voltage changing whatsoever.

ATMEL is all about microcontrollers now... Judging by the fact that its the only chip there, thats what I'd assume it is.
Logged
But wasn't it fun to think you won the lottery, just for a second there???

rockin_rick

  • Trade Count: (+3)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 495
  • Last login:May 27, 2017, 09:20:20 am
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #8 on: December 16, 2006, 07:12:11 pm »
Quote from: Ed_McCarron on December 12, 2006, 12:46:36 pm
Quote from: ChadTower on December 12, 2006, 11:11:54 am

If I recognize that chip properly, it's just an eeprom.  No voltage changing whatsoever.

ATMEL is all about microcontrollers now... Judging by the fact that its the only chip there, thats what I'd assume it is.

Yes, it is a microcontroller.  Feeding it 7V will not work.

Rick
Logged
If I do not respond to your post in a timely manner, feel free to PM me.

Kevin Mullins

  • Trade Count: (+2)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 4504
  • Last login:February 01, 2021, 01:29:34 pm
    • Me on Myspace
Re: Is 7-volts too much for a 5-volt requirement?
« Reply #9 on: December 16, 2006, 09:23:58 pm »
Maximum DC voltage listed is 6.0v ......... DC
http://www.atmel.com/dyn/resources/prod_documents/doc1477.pdf

As already mentioned....
Use the 5.0v DC from a PC power supply if this is indeed for a MAME project or something similar that is using a PC.
Logged
Not a technician . . . . just a DIY'er.
Pages: [1]
  
Go Up
« previous next »