This regulated power supply shows the use of integrated circuits LM317T. A source in the form of a module can be used wherever required voltage in the range from 1 to 37 V and current up to 1.5 A.
Using it, you can also construct a stationary power source with good parameters. The source structure is simple and the circuit tested and reliable - requires no adjustment and start-up. Works immediately after it is turned on under the condition proper installation. Mains transformer used in the source should to have a maximum output voltage 28 V and an amperage of at least equal the required force of the power source.
- US1.....LM317;
- R1.....220 ohms;
- D1-D4.....Part no 1n4001;
- P1.....4.7 Ohm;
- C1....1000 µf/40V;
- C2.....of 0.47 to 1 μf/63 In
Transformers, a commercially available, meet such requirements TS40/81, TS50/47, TS60/12, TS70/17. The transformer should be connected with the Board short wires of large diameter. In the case of powered device or scheme located quite far from the source, it is recommended to lock the findings additional power capacitor a minimum capacity of 100 nF (best ceramic) as close as possible to nourish the scheme. The LM317T regulator is protected from short circuit, but also has limitations on the maximum lose power.
You should equip it with an aluminum radiator surface area of at least 1 dm2. The full potential of the LM317T circuit occurs only when using a mains transformer with a split secondary winding, so that he supplied the highest input voltage (for example, 28 In) at the output voltages above 15 V.
The voltage difference should be kept as low (below 3), you may use the rated output current.
Author: D. A. Movchan