RadioShack® Adjustable-Voltage Regulator LM317T

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

an easy fix to save me batteries in my antique equioment

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

The pin configuration on the package does not match the pin configuration from the schematic on the package. NOT helpful.

Radio Shack and the manufacturer need to correct the information on the package.

Be careful when you put the voltage regulator into a circut. Go on the web and download a product data sheet which will show the PROPER pin configuration.

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

I needed a panel-mounted clean power supply for my giant 7-band audio spectrum analyzer. I've collected many wall-mounted DC adapters from discarded equipment and had been using one of those during the development phase. All but two of them produced stray signals in the 120V lamp display matrix when the source audio signal was paused, which made me concerned that I would run into this problem with a purchased panel-mount unit. I decided to first try building my own unit, so I bought a 12.6V 300mA transformer; a 1.4A, 100V full-wave bridge rectifier; a 1N4004 diode; and an LM317T regulator. When I assembled these components with resistors and capacitors that I already had, I was able to produce a 5VDC output that generated no stray signal output in the. Everything performed to my highest expectations. I am extremely satisfied.

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

This device, Voltage Regulator 276-1778 clearly should have a heatsink but none is associated with this product in the catalog nor do store employees have any idea what a heatsink is or what electronic components are for. Product worked well but sadly if you are not sure how to utilize it there will be no help from RadioShack. In other words product was great customer service not observed.

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

Used this to power a camera in a car. Works great. Definitely recommend using a heat sink(lesson learned). The diagram and pinout on the package is correct(contrary to what some are posting).

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

In case anybody needs the equation to figure out how to get the output voltage to be what they want, here it is. Vout = 1.25V( 1 + R2/R1)

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

Very glad Radio Shack was open at 730 on a sunday night and had this in stock. Was building a linear PSU and thought I had some 317's in my stock but they were not there....thought I would have to wait but didnt have to. Almost surreal that they were still open! Hope they do not slim down the components section of Radio Shack any more than they already have over the last 20 years.

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

I wrote another review further down describing how I fried some parts, well I'm back with new parts for my 110cc ATV voltage regulator. I had to substitute the (R1 240 ohm) with a 220 ohm & the (R2 5K ohm) with a 10K ohm "my Radio Shack didn't have them". I used the smallest ABS project enclosure I could find (270-1801) and cut a 1" square hole in the top so I could attach the LM317T heat sink to a 2" square aluminum heat-sink I stole from an old PC video card. After sanding enclosure to score the mating surfaces I attached & sealed the aluminum heat-sink to the ABS enclosure with a bead of JB-Weld. Drilled a 1/8" hole through my heat-sink and bolted the LM317T heat-sink to it. I used my 19v Black and Decker battery again to set the regulated output voltage at 13.2v. I got the circuit working again and made sure that all solder connections where solid and no plug wires from my ATV harness where loose. Sealed the whole thing up with some Black RTV and installed it on my ATV. It works great! I have been using it for a month now and the ATV regulator at idle puts out 12.5v, Full throttle puts out 13.23v (0.1amp-1.2amp). My home made regulator only gets warm (never hot), my 12v 4A battery stays charged. PS- one day I had to temporary substitute the ATV 10amp fuse with a 1amp (slow blow) It worked for about 10 minutes then blew. The regulator was putting out more than the fuse could handle, Awesome! PSS- The diagram on the back of the package does make sense if you reference data-sheets from the internet (recommended). The diagram just needs to be better illustrated. The parts and info is there, it just isn't obvious like it should be.

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

I completely agree with everyone else that the diagram on the package is completely useless. Unlike most of the other reviewers here, the one I got today is made by Fairchild Semiconductor. I Googled Fairchild LM317 and the first link was the data-sheet I needed to find out which pins are 1, 2, and 3. Mine is being used for a variable speed fan controller, which varies the voltage (to a 12V 600mA fan) from about 5V to about 10V. This fan will be used to blow solder smoke away from me while I am soldering at work.

Comments about RadioShack Adjustable-Voltage Regulator LM317T:

This is a great regulator and is easy to set the voltage with a 15 turn potentiometer however all settings will change depending on the voltage you apply to it.

When my old HP laptop failed I was stuck with a nearly new 19 volt power supply at close to 4 amps output. In order to make it useful for powering other items from time to time, I took the 19 volt output and applied it to a 7812 regulator, the output of the 12 volt regulator feeds the input of the LM317t regulator. By doing that no matter what voltage supply I use above 13.8 volts I get a constant 12 out of the 7812 and a constant 8 out this regulator.

Only bad thing I can say the pinout on the package I bought was backwards.