First time Cmoy wall power help

Assuming the Elpac WM080 is one of the power supplies you are referring to and assuming you are located in the United States I would say you can order it from Allied.

http://www.alliedelec.com/search/productdetail.aspx?SKU=8791080

I believe Jameco offers a lower cost alternative but.....

Not really. Linear regulated supplies at Jameco cost about the same. Shipping may make a difference - Allied has a $5 surcharge on orders under $25.

Switching supplies are cheaper at both stores, but you probably don't want those.

It certainly looks like a lower cost alternative to me.

http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_174879_-1

It's categorized as a switching supply, but the spec says linear. Your guess is as good as mine as to which database field was populated incorrectly. The datasheet doesn't have an entry in that field at all, although it does list a 5% tolerance.

If it is linear, it feels a bit dishonest...on the other hand, I'm sort of poor.

could just play it safe and give them a call *shrug*

Be safer if someone's bought it before and knows.

If it is a DB error, asking them might get it fixed.

I don't know if I like what you are suggesting.

 I never would have mentioned it in the context of this thread had I not already known if it was a linear regulated AC adapter or not.

Don't worry about the wall wart, just build a simple trickle charge circuit and a 9volt rechargeable battery and run it off that

then you won't care about the quality as long as it has enough umph to charge overnight

cheers

FRED

Quote:

Originally Posted by MisterX 

I don't know if I like what you are suggesting.

 I never would have mentioned it in the context of this thread had I not already known if it was a linear regulated AC adapter or not.

 

I think one of us is getting a little confused, because that seemed a bit non-sequitur from here. I take it though that you have prior experience with the unit in question and know that it's linear? Because Jameco lists it as both.

 

Quote:

Originally Posted by Fred_fred2004 

Don't worry about the wall wart, just build a simple trickle charge circuit and a 9volt rechargeable battery and run it off that

then you won't care about the quality as long as it has enough umph to charge overnight

 

cheers

FRED

You shouldn't really run a battery at trickle constantly.

This is also a bit of an unnecessary workaround. You're going to have to get a DC adapter to charge it anyway, right? Might as well buy a linear supply.

Seems like the datasheet is saying it is a linear by the simplified schematic.

And MisterX always seems to know his parts...

Quote:

Originally Posted by cobaltmute 

Seems like the datasheet is saying it is a linear by the simplified schematic.

 

And MisterX always seems to know his parts...

Ah, at the bottom of page two. Thanks, that would confirm it.

Not questioning whether he does...I just don't assume that everyone has used every part that they mention finding in a catalog unless they explicitly state that they have.

I'dn't say to keep it trickle charged constantly I said over night

cheers

FRED

Quote:

Originally Posted by Fred_fred2004 

I'dn't say to keep it trickle charged constantly I said over night

 

cheers

FRED

Ah. To be honest, I tend to stop reading run-on sentences once I've got a general grasp of where it's trying to go.

But "overnight" doesn't really make it any better for a desktop application. You either have to be constantly switching or connecting the power (and remembering to do so), or else you have to build a timing circuit to do it for you automatically (at which point you might as well just do on-demand charging).

This sort of thing is necessary for a portable device, but generally unacceptable when "I don't plan on using it as something mobile at all." And it's quite pointless when someone found a cheap linear regulated wall-wart to do the job.