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PETH-317.php 5682 Bytes 14-06-2015 12:26:37
A small power supply for universal use.
This project describes a little power supply, based on a LM317, adjusteable from 1.25 to 30 V, delivering approx. 1 Amp.
Yet another nice to have building block :-)
The PETH-317 power supply - small but useful ...
The circuit consists of a bridge rectifier, build with 4 diodes (1N5062), then a storage capacitor 3300 µF, 35V (farnell
and finally the good old 'LM317'. The circuit is not that new or stupendous, but it is a handy circuit which should be in every library of building blocks.
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.
Step Response when current is increased from 100 mA to 1100 mA. When dissipating a lot of power, a heatsink mayst be adviseable.
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