SparkFun Electronics - Breadboard Power Supply USB

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Product Info

Breadboard Power Supply USB - 5V/3.3V

sku: PRT-08376

Description: A very simple breadboard power supply kit that takes power from any USB port and outputs a fuse protected and regulated 3.3V. The .1" headers are mounted on the bottom of the PCB for simple insertion into a breadboard. Pins labeled 5V/GND 3.3V/GND plug directly into the power lines.

When you plug this board into a breadboard you must be aware that the unused power and ground pins will short if they are inserted into a bread board row. To avoid this problem, orient the board so that the unused power pins are left off the side of the breadboard. You can also orient the board sideways and utilize both 5V and 3.3V at the same time.

USB v2.0 specifies a max of 500mA at 5V. The on-board fuse limits the current to 500mA. Board has a handy On/Off switch.

Comes as a bag of parts kit and is easily assembled if you can follow the silkscreen indicators and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes.

Check out our Unregulated Power Supply Tutorial!

Kit Contains:

USB type B connector
TO-220 Voltage Regulator (LM317 1.5A max current)
PTC Resettable Fuse
100uF 35V Capacitor
10uF 25V Capacitor
0.1uF 50V Capacitor
Power LED
SPDT Slide Switch
4pcs 0.1" Header Pins
330 Resistor 1/6W
390 Resistor 1/6W
240 Resistor 1/6W
Bare PCB with Silkscreen Indicators

Documents: Schematic
Dimensions: 1.25x1.25"

Pricing

	52 in stock backorder allowed

$9.95	price
$8.96	10-99 (10% off)
$7.96	100+ (20% off)

	quantity

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Comments

9 comments

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	by galaviel@yahoo.com +1.3 \| May 27, 2009 at 0:22 AM 0
Just wondering how to get 5V supply from the usb ... What kind of conditioning the VBUS needs ... should I take this kit but remove the voltage regularot + resistors R1 and R2? i.e. create a short between the positive of C1 and C2 and remove anything in between ( reg + 2 resistors) ? OR maybe there is a kit available for this purpose already? seems awfully useful but can't find it...

	by cwilson +3 \| May 27, 2009 at 11:13 AM 0
Check out 6.1 in this datasheet: http://www.ftdichip.com/Documents/DataSheets/DS_FT232R_V202.pdf

	by hakuna +1.5 \| June 5, 2009 at 4:42 PM 0
I was wondering about the Gnds on this PCB. How are they connected? Or are they?

	by Surya Sharma +1.1 \| October 12, 2009 at 0:27 AM 0
You do know that its a Double Sided PCB, I hope.

ISR

+1.1

| January 16, 2010 at 3:35 PM

I ordered one of these. The kit came without the power LED. The GND holes for the 0.1" header pins are at a diagonal to the 5V and 3.3V header pin holes; so it's basically impossible to connect the two pairs of 0.1" headers to the board. Even if I broke them into 4 separate 0.1" headers and soldered them to the board individually, the breadboard would not accept the pins because they aren't spaced correctly. Not sure who dropped the ball on this one - well done.

tlied2

+6.2

| January 16, 2010 at 8:21 PM

SFE is usually good about replacing missing parts, so feel free to contact support via email about that. As for the pin locations, as the name of the item indicates, it is intended for use with a breadboard. The staggered pins allow easy use with breadboards in that you can power the long horizontal bus at one voltage, and the other pins could be on the shorter vertical span (and jumpered over to you other bus if you like). It can also work with only vertical spans (like on the tiny breadboard), but the board will likely cover the pins on one side, so its easiest on a board that small if you only need one voltage (but its easy to get at both voltages with any of the boards with the horizontal power busses).

ISR

+1.1

| January 19, 2010 at 8:09 AM

Thanks for clearing that up. I just used a red LED I had lying around. No use getting a $0.25 part shipped from SFE. I soldered the headers up and it does fit in the breadboard. It is just awkward looking at it before soldering it, but it makes sense I suppose so that nothing is shorted when the supply is plugged in. One thing that worries me a little bit is that the 5V out is giving 5.14V on my multimeter. Looking at the schematic I can see that the 5V is straight from the USB cable. I guess I'll just have to be careful.

Earlz

+1.1

| January 23, 2010 at 10:54 AM

I'm very new to soldering and such... and yes as @ISR said, I was also missing a power LED. I have plenty LEDs laying around though, so I'm not worried about it..

I'm a bit confused as to how the header pins are to go on this PCB though. Are you suppose to put the pin through the bottom so that the plastic sits on the bottom and you solder it from the top of the PCB(where all of the components are)?

	by Earlz +1.1 \| February 1, 2010 at 10:07 PM 0
Yea, after googling for similar PCB kits, you do solder the pins in from the top incase anyone else is wondering. It might not seem right, but it is...