Needham EMP-20 Power supply?

[Joe]

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

 

[Sergey Kubushin]

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.

 

[mike]

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]

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

 

[Electric dabbler]

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

 

[Jeff Miller]

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....