Re: update

randomname wrote:
Today I purchased a wall transformer from the dollar store (liars -- it
was $3.59) that has 1.5, 3 4.5, 6, 9, and 12 volts, and works with 110
or 220 volt inputs, and provides 500mA of current.

So this replaces my 4 AA batteries, which would run weak after a couple
of hours. Strange thing is, when set to 6v it really makes my set-up
go crazy. The pump pumps way more liquid, and the strobe lights just
go crazy.. they flash brightly and irradically.

So I switched it to 3v and everything is fine. Pump runs very stable,
and the LEDs are steady and bright. It's been running for over an hour
completely stable (except for the normal hiccups and jitter caused by
my crappy pump). The wall transformer is just warm (about 115 F), so I
figure it's happy.

I wonder why I need to set it to 3v. If i switch it to 220v mode, I
need to crank it up to 12v for it to run about the same. If anyone can
explain this I'm all ears.

Oh well, it works!

-sam

See the post from John Popelish. Then add this circuit:

-----
+9 ---+----Vin|LM317|Vout---+----+---> +6
| ----- | |+
[C1] Adj [R1] [C2]
| | | |
| +----------+ |
| | |
| [R2] |
| | |
Gnd ----+----------+---------------+---> Gnd

C1 = .1uF, C2 = 10uF 25V
R1 = 240, R2 = 910

Mount the LM317 on a small heat sink.

The circuit regulates the 9V (nominal) coming
from your adapter to provide a steady 5.99 volts.
The adapter will put out more than 9 volts with no
load. You could set the adapter to 12 volts,
but that would be of no benefit, and would heat
up the LM317 more that it needs to be.

Ed
.

Relevant Pages

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