Product Details
- Brand: NightFire Electronics
- Model: #1725
Features
- Uses the LM317T Voltage Regulator
- Converts AC to a variable DC Voltage
- Can supply up to 1 Amp of DC Current
- Clean output voltage
- Short-Circuit protection
Product Description
This Adjustable +Voltage Power Supply Project Kit is designed around the LM317T 3-Terminal Adjustable Voltage Regulator in the TO-220 package. It is capable of supplying in excess of 1.0 Amps over a range of 3 volts to 25 volts output. This kit consists of the PCB, Schematics, and parts required to build a 1-amp (or more), highly regulated Adjustable DC Power Supply. It requires an input AC or DC voltage source (3 V to 30V) from a transformer, such as a wall-mount type. A heat sink (not supplied) may be needed for the LM317T, depending on your application. You will need soldering tools and basic soldering skills. The output voltage is varied with a potentiometer and is very steady and accurate even while the input voltage varies. The output can be varied from around 1.2VDC up to 25 VDC depending on the input voltage and the choice of resistors. This circuit is perfect for those that want their own small but powerful power supply. It can be used on the bench or as part of your project. It is small enough to fit in robotic vehicles and such. The PCB is 1.1" x 2.0", double-sided, .062", FR-4, with Silk Screening on the Top Side. This is an excellent chance to build your own Power Supply.
Customer Reviews
Most helpful customer reviews
2 of 2 people found the following review helpful.
By DJ
Not just for beginners, though. This kit is inexpensive and easy to build. I have built three to be used with a solar panel to power my Ham radio hand-held. They are great for the money.
1 of 1 people found the following review helpful.
By Joseph N. Rotello Jr.
Actually, a well-done little kit. Well made, and by following procedure, careful assembly, and careful soldering, a very nice regulated and variable power supply results. Why a small, 20 cent ($US) little "U" shaped or "star" heat sink was not included is unusual, as these LM317T based circuits almost universally mount a heat-sink to the LM317. Without the heat-sink, the circuit can provide up to 1 amp current to the unit being powered, and with a heat-sink, up to about 1.5 to nearly 2 amps absolute maximum.Suggest using an accurate DVM (digital volt meter) to monitor and set the voltage. There is no one power transformer voltage rating that will supply the entire approximate 1.5V to 30V or so output range, rather, the transformer selected provides a range of DC output. So, for example, a 12V AC transformer at the input will usually provide about 5 to 8 V DC range of adjustment, a 15V transformer will provide about 8 to 13V DC output range, etc. This range will vary a bit depending on the choice of resistor values included with the kit.
1 of 3 people found the following review helpful.
By James Griggs
It is an adjustable PS however the included pot is rated at 10K Ohm's which means fine tuning is out. It has very course adjustments meaning a very slight turn changes the voltage by an entire volt. It is really difficult to get an exact voltage just down to the .1 variation like 3.5 or 4.5 are difficult to achieve. Also there is a 1.2 volt drop from source. This means if you want a 5Volt output than you need at least 6.2 volts coming in. I guess you get what you pay for!
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