[Matt]

Hello, all.

Is RatShack part no. 273-1690 good enough to act as a replacement for the OBH-2 ps upgrade for the OBH-8? I notice the mA rating is higher (good, I presume) and the output voltage is the same. The only difference, I guess, is that the RatShack is not "regulated," whatever that means.

Is it at least going to perform some sort of upgrade, or is it going to be just another rehash of the basic stock PS, even though that is 24v / 150mA?

Since the mA rating is twice that of the $149 OBH-2, does that make it sonically even better or give it more potential/whatever?

I guess my overall, generic question would be: is there a PS that is to the OBH-8 what the Stancor is to the Art DI/O?

Regards,
Matt

 

[Matt]

http://www.radioshack.com/product.as...Fid=273%2D1690

 

[TravelLite]

Matt, that RadioShack adapter is AC-to-AC. It looks like you need AC-to-DC instead.

TravelLite

 

[Matt]

...I see.

Hmmm...so does this mean I am absolutely going to have to pay Creek $149 for a blasted power supply?

- Matt

 

[puppyslugg]

Quote:

Originally posted by Matt ...I see. Hmmm...so does this mean I am absolutely going to have to pay Creek $149 for a blasted power supply? - Matt

Build one.

 

[Matt]

...where I could get plans? I have some nice protoboard...

- Matt

 

[puppyslugg]

Hi Matt,

I've emailed you the schematic.

 

[Matt]

...thanks for that! So this will work to the specifications I need (120VAC input/24V DC, 12 Watt, 500 mA output)?

Regards,
Matt

 

[Matt]

...well, I don't really understand much of that diagram...I suppose I'll have to read up on some of those symbols. What is a "zener", anyways?

Regards,
Matt

 

[puppyslugg]

The schematic is for a bipolar (+ and -) power supply. You need only focus on the positive supply(the upper half).

A zener is a diode. The zener is what sets the output voltage of the supply. In your case, you need about a 22-23v 5watt zener. 23v zener because you need to substract 1.2v from lt1085's reference voltage. And that's how you end up with 24v output.

If you don't want to mess with making one, look at a Elpac ps. It'll be cheaper than $150, I think...

 

[Matt]

...I found the following:

http://www.mouser.com/index.cfm?hand...e_pcodeid=6801


It's a 24V DC output at 12W and 0.5A. This looks about right, no? How about that barrel connector? How will I know if that will fit? The Creek specs say "The DC power cord is always fitted with a 2.1mm DC jack plug with the centre positive."

and the specs for this are "Barrel type (5.5 x 2.5 x 9.5mm)"

Will I have to snip and solder on a RatShack barrel jack plug?

- Matt

 

[puppyslugg]

What is the current output rating of the Creek ps?

The only real concern is the connector and polarity, and I don't think there are any options. So you just need to order it and see, when it arrives and prepare yourself for the possibly of having to change the connector.

 

[Matt]

...that would be the case.

Will my multimeter be able to tell me which is which, or is there some other way to distinguish hot from ground?

Regards,
Matt

 

[puppyslugg]

On the Creek, it should should show if the center pin or barrel is the hot. If the center connector is the 'hot', then the elapc should be ok. The only question then would be: does the connector fit.

You can use a multimeter to check the polarity.

 

[Matt]

Thanks a lot for all the help, puppyslug.

Regards,
Matt