SparkFun Electronics - Breadboard Power Supply Stick 5V/3.3V

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Product Info

Breadboard Power Supply Stick 5V/3.3V

sku: PRT-09319

Description: This is a very simple board that takes a 6-12V input voltage and outputs a selectable 5V or 3.3V regulated voltage. All headers are 0.1" pitch for simple insertion into a breadboard.

Input power can be supplied to either the DC barrel jack or the two pin header labeled + and -. Output power is supplied to the pins labeled GND and VCC. Board has both an On/Off switch and a voltage select switch (3.3V/5V).

The two pairs of GND and VCC pins are spaced such that when connected to our Basic Breadboard both power busses will be powered.

Check out our Unregulated Power Supply Tutorial!

Features:

6-12V input voltage via barrel jack or 2-pin header
3.3V or 5V regulated output voltage
ON/OFF switch
Output voltage select switch
Power status LED
PTC fuse protected power

Documents: Schematic

Dimensions: 2.15x0.65"

Pricing

	3 in stock backorder allowed

$14.95	price
$13.45	10-99 (10% off)
$11.96	100+ (20% off)

	quantity

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Comments

6 comments

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	by Drone –3.3 \| August 21, 2009 at 0:04 AM 0
What we need is the same thing with fixed 5V and 3.3V regulators. These should be LDO regulators with SMT. The single regulator on this board looks to be the old LM317 adjustable in SMT package; this is likely not an LDO regulator. Plus I'm worried the parasitics with the SMT 10uF cap; might make this unstable.

	by SDavis +0.92 \| September 1, 2009 at 4:36 PM 0
It would be great if this was offered as a kit for learning SMD soldering.

	by blink4jona +2.8 \| October 15, 2009 at 0:59 AM 0
Small problem with this board. Notice in the picture the board is tilting off the side of the breadboard? Soldering in the VCC, GND breakaway pins on either side of the board prevents the board from laying flat, and the power cord usually pulls it down bending the pins. I call this a small problem because you can stick some rubber feet/bumpers on the back half of the board to even it out.

	by kewakl +2.9 \| December 27, 2009 at 4:36 PM 0
versions with AVR, PicAxe, arduino programming connectors would be nice.

	by ITPro +1.2 \| January 22, 2010 at 10:39 PM 0
I have this power supply and I have always used it with a 9V battery. I have a 9V 1Amp wall wart that I am tempted to plug into it... is that a bad idea? what is the max current that this power supply can take? thanks for any info you can give me.

russosv

+5.7

| February 2, 2010 at 1:40 PM

The 1 amp that your wall-wart is rated at should be the *max* amperage that it can potentially supply. What actually flows through the regulator will depend on what your circuit consumes.

Since the data sheet rates the LM317 as being able to supply a "guaranteed 1.5A of output current", the regulator should be able to handle 1A.

In any case, your average breadboarded digital circuit will probably consume a current on the order of milliamps... unless you're dealing with motors or incandescent lights it's not likely you'll draw that much current anyway... anything you're powering with a 9V battery already should be fine.

(Plus it looks like SF built a fuse into this too!)

My vote would be yes, go ahead and plug that bad boy in!

LM117/317 datasheet