Dubuque, IA Free Moderated Classifieds Site > OLD ADS FROM PREVIOUS YEARS
> 2003
> April
> Adjustable power supply with transformer kit
Adjustable power supply with transformer kit
Adjustable Power Supply with Transformer Kit
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This Adjustable +Voltage Power Supply Project Kit with Transformer and PCB is designed around the TL431 Shunt Regulator and a high-current Pass Transistor. This kit is a linear, step-down DC-to-DC converter. This power supply will convert a DC input to a smaller DC output voltage of your desire. It can also be used as an AC-to-DC step down converter equally as well. The circuit consists of a Bridge Rectifier, a high capacitance ripple-filter Capacitor, a high-current Pass Transistor controlled by a TL431 Shunt Regulator, a +12 VDC Wall-Mount Power Source, and the necessary resistors and capacitors to make it work. It even includes an LED to let you know when power is available at the output. There are extra resistor values so you can experiment with the kit.
This kit consists of the PCB, Schematics, and parts required to build a 300mAmp, highly regulated Adjustable DC Power Supply. A heat sink (not supplied) may be needed for the Pass Transistor, 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 3.0 VDC to 11.0 VDC depending on the input voltage. The Application Note for the TL431 is available at so that you can design your own power supply. 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 2.1", double-sided, and has 4 mounting holes. This is an excellent chance to build your own Power Supply. We supply the parts, you supply the ingenuity. You get the following:
NightFire Adjustable Positive Voltage Power Supply
TL431C, Adjustable Shunt Regulator
2SD1213, NPN, Silicon, 12 Amp, TO-3P
W02G, Full-Wave Bridge, 1.5 Amp, 200V, Glass Passivated
100uF, 25V, 85° C, Aluminum, Radial
1000uF, 35V, 85° C, Aluminum, Radial
680 Ohm, 1/4 watt, 5%, Carbon Film
820 Ohm, 1/4 watt, 5%, Carbon Film
1.0K Ohm, 1/4 watt, 5%, Carbon Film
1.5K Ohm, 1/4 watt, 5%, Carbon Film
2.2K Ohm, 1/4 watt, 5%, Carbon Film
3.3K Ohm, 1/4 watt, 5%, Carbon Film
4.7K Ohm, 1/4 watt, 5%, Carbon Film
5.6K Ohm, 1/4 watt, 5%, Carbon Film
10K Ohm, 1/4 watt, 5%, Carbon Film
12K Ohm, 1/4 watt, 5%, Carbon Film
15K Ohm, 1/4 watt, 5%, Carbon Film
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