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PETH-1074.php   5585 Bytes    21-10-2015 08:38:27


A small power supply for universal use.

This project describes a little power supply, based on a LT1074, adjusteable from 2.5 to 50 V, delivering much more than 1 Amp. Yet another nice to have building block :-)

PETH-1074, LT1074

The PETH-1074 power supply - small and educational

   Output 2.5 to 50 VDC @ 3 A regulated low ripple DC voltage
   Onboard potentiometer for output voltage adjust
   Onboard bridge rectifier for AC voltage input
   Screw Terminal connectors for input and output
   Four mounting holes of 3.2 mm each
   PCB dimensions 52 mm x 45 mm

✈ Circuit

The circuit consists of a bridge rectifier, build with 4 diodes (1N5062), then a storage capacitor 2200 µF, 35V (may be changed), an LT1074 and a 47 µH inductor. An SB560 schottky diode was used. The circuit is not that new or stupendous, but it is a handy circuit which should be in every library of building blocks. Designed for educational purposes.

✈ Downloads

✈ Performance

In order to test the performance, we built some of those circuits. We used the following equipment : LD-300 DC ELECTRONIC LOAD BY TTI, FLUKE 8846 A to do the measurements. One voltage which is very often used is +5 V. The diagramm below shows the measured characteristic.

PETH-1074 Kennlinie

PETH-1074 Step Response

Step Response when current is increased from 500 mA to 3000 mA. When dissipating a lot of power, a heatsink mayst be adviseable. The region with the higher ripple corresponds to the higher current.

✈ Share your thoughts

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t1 = 6585 d

t2 = 222 ms

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