Benchtop Power Supply

Difficulty

Power

Summary

What better way to get back in to work with your own personal benchtop power supply. Uses a LM317 for power output and provides a separate 5V rail.

You will need a power supply higher than 7V to power this unit, and it will only be able to power up to 2V less than the power you give it.

Example

If you want to have an adjustable 2-28V supply, you will have to use a 30V power supply.
If you give it a 17V power supply, it will be adjustable between 2V and 15V.

Materials Required

1	Jiffy Box - Black - 158 x 95 x 53mm	HB6011
1	LM317T +1.2 - 37V 1.5A Adjustable Voltage Regulator	ZV1615
1	7805 +5V 1A Voltage Regulator TO-220 case	ZV1505
2	TO-220 Heatsink 15.8mm	HH8516
1	Universal Pre-Punched Experimenters Boards - Medium	HP9552
1	Zinc Oxide Heatsink Compound - 10g Tube	NM2010
1	LED 3.5 Digit Panel Meter - Low Cost	QP5580
1	SPDT Miniature Toggle Switch - Solder Tag	ST0335
1	Add On Board For QP-5570/80 Panel Meters	QP5575
1	5k Ohm Linear (B) Single Gang 16mm Potentiometer	RP7508
1	240 Ohm 0.5 Watt Metal Film Resistors - Pack of 8	RR0557
1	10uF 25VDC Electrolytic RB Capacitor	RE6070

Table of Contents

Considerations
Connections
Assembly
Case
Use

Considerations

● In this project we have allowed you to select your own power sockets and knob for the adjust. You could use the same PS042X series that we have, or use something like the PT045X series. The choice is really up to you.

● You will also need some wires to connect different components together, if you don't have it already, the WH3009 8 Colour pack is a good choice to have in your workshop.

● WT5320 Banana lead to Alligator clips is a great addition for this project as you can start using it right away once you've finished.

● Good Power supply design includes fuses (SF2160) and fuse holders (SZ2028), however this is simply more as a guide to get your feet wet; If you want to include fuses, wire them inline right between the switch and DC socket.

Connections

In this project we have allowed you to select your own power sockets and knob for the adjust. You could use the same PS042X series that we have, or use something like the PT045X series. The choice is really up to you.

You will also need some wires to connect different components together, if you don't have it already, the WH3009 8 Colour pack is a good choice to have in your workshop.

WT5320 Banana lead to Alligator clips is a great addition for this project as you can start using it right away once you've finished.

Good Power supply design includes fuses (SF2160) and fuse holders (SZ2028), however this is simply more as a guide to get your feet wet; If you want to include fuses, wire them inline right between the switch and DC socket.