The great mystery volt caper

Dr.No

I'm trying to hook up a a/c to DC adapter to my BS1.
It is a 120v to 9V adapter and I want to hook it up using the
9v battery hookup and not the Vin.

But on testing it with a volt meter - it registers a constant
fluctuation of volts up to 16V.

I tested 3 adapters and all gave different readings - far higher
than the rated volts that is 9 - which I think could be dangerous
for the 9V port and the BS itself.

The reason I'm doing this is that I need the BS to be constantly
powered for my test. Using a 9V (8.77v) battery can fail at any time and
destroy the results of my test.

Thanks.

Franklin

I would get a REGULATED power supply or pre-regulate your power to 7-9 volts before using. Vin has a range of 5 to 15 VDC

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- Stephen

Dr.No

I'm going to have to try one of those adjustable power supply.

Thanks.

RDL2004

All you need is a regulated wall adapter. You don't need adjustable. Take a look at the bottom of this page at the "Slim Line" series:

http://www.jameco.com/Jameco/catalogs/c281/P159.pdf

The ones that are 9 volt work very well for this type of application. The plug is·exactly what you need for Parallax dev boards (2.1mm center positive).

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- Rick

Dr.No

Thanks. It's the first I've seen a regulated adapter.
I guess you learn something new everyday.