Needham EMP-20 Power supply?
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Needham EMP-20 Power supply?

 
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Joe
Guest
Posted: Sat Feb 19, 2005 6:10 am    Post subject: Needham EMP-20 Power supply? Reply with quote
Hi,

Ive got an emp-20 without a power supply. Anyone know what this thing
takes??

The power goes to a bridge rectifier on the board so I assume its AC, but
what voltage??

Thanks, Joe

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Sergey Kubushin
Guest
Posted: Sat Feb 19, 2005 1:20 pm    Post subject: Re: Needham EMP-20 Power supply? Reply with quote
Joe <no-one@gmail.com> wrote:
Quote:
Hi,

Ive got an emp-20 without a power supply. Anyone know what this thing
takes??

The power goes to a bridge rectifier on the board so I assume its AC, but
what voltage??

As I recall its 12 VAC. But I may be wrong... I do have EMP-20 on my desk in
the office and I do use it. So if you didn't find the information anywhere
else, please send me an email and I'll reply you Monday morning when I'm at
my desk.

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* Las Vegas NV, USA < > Miracles require 24-hour notice. *
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mike
Guest
Posted: Sun Feb 20, 2005 6:10 am    Post subject: Re: Needham EMP-20 Power supply? Reply with quote
Joe wrote:
Quote:
Hi,

Ive got an emp-20 without a power supply. Anyone know what this thing
takes??

The power goes to a bridge rectifier on the board so I assume its AC, but
what voltage??

Thanks, Joe



mine says 12VAC 25VA.
There's a product design flaw.
There's a sticker on the supply that says "fused secondary, do not
short." And they mean it.
If you are not careful the connector locking clamp can short the outer
shell of the power connector and blow the fuse. I bent the clamp so it
couldn't short. You have to bust the supply apart to fix the fuse.
If you use an unfused supply, you'll want to be sure you can't short it
with the locking clamp.
mike

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Joe
Guest
Posted: Sun Feb 20, 2005 6:10 am    Post subject: Re: Needham EMP-20 Power supply? Reply with quote
On Fri, 18 Feb 2005 17:32:32 -0800, Joe wrote:

Quote:
Hi,

Ive got an emp-20 without a power supply. Anyone know what this thing
takes??

The power goes to a bridge rectifier on the board so I assume its AC, but
what voltage??

Thanks, Joe


Thanks! 12vac it is.

Got it working now.

Thanks again...

/Joe
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Electric dabbler
Guest
Posted: Tue Feb 22, 2005 7:45 pm    Post subject: Re: Needham EMP-20 Power supply? Reply with quote
Hi Joe,

I've just dug out the manual for mine and they helpfully don't say!

I seem to remember it was 12- 16V AC or DC. I've always used mine with the
12V unregulated (really 14 - 15V) DC wall wart that came with a small
portable TV.

Philip
"Joe" <no-one@gmail.com> wrote in message
news:pan.2005.02.20.02.54.07.30886@gmail.com...
Quote:
On Fri, 18 Feb 2005 17:32:32 -0800, Joe wrote:

Hi,

Ive got an emp-20 without a power supply. Anyone know what this thing
takes??

The power goes to a bridge rectifier on the board so I assume its AC, but
what voltage??

Thanks, Joe


Thanks! 12vac it is.

Got it working now.

Thanks again...

/Joe
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Jeff Miller
Guest
Posted: Sat Mar 12, 2005 5:49 pm    Post subject: Re: Needham EMP-20 Power supply? Reply with quote
Electric dabbler wrote:

Quote:
Hi Joe,

I've just dug out the manual for mine and they helpfully don't say!

I seem to remember it was 12- 16V AC or DC. I've always used mine with the
12V unregulated (really 14 - 15V) DC wall wart that came with a small
portable TV.

Whew, that deosn't seem likely. I assumed it used AC to get a wide range
of + and - voltages to support different chips/programming algorithms,
some in excess of 12V. Don't some old EPROMs need 21V?

Perhaps your DC supply covers most modern chips, or perhaps I'm totally
wronng....

Quote:

Philip
"Joe" <no-one@gmail.com> wrote in message
news:pan.2005.02.20.02.54.07.30886@gmail.com...

On Fri, 18 Feb 2005 17:32:32 -0800, Joe wrote:


Hi,

Ive got an emp-20 without a power supply. Anyone know what this thing
takes??

The power goes to a bridge rectifier on the board so I assume its AC, but
what voltage??

Thanks, Joe


Thanks! 12vac it is.

Got it working now.

Thanks again...

/Joe



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