Saturday, September 20, 2014
Simple 5V Regulated Power Supply Wiring diagram Schematic
5V Regulated Power Supply Circuit Diagram is a small +5V power supply, which is useful when experimenting with digital electronics. Small inexpensive wall tranformers with variable output voltage are available from any electronics shop and supermarket. Those transformers are easily available, but usually their voltage regulation is very poor, which makes then not very usable for digital schema experimenter unless a better regulation can be achieved in some way.
The following schema is the answer to the problem. This schema can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The schema has overload and thermal protection. The capacitors must have enough high voltage rating to safely handle the input voltage feed to schema. The schema is very easy to build for example into a piece of veroboard.
The following schema is the answer to the problem. This schema can give +5V output at about 150 mA current, but it can be increased to 1 A when good cooling is added to 7805 regulator chip. The schema has overload and thermal protection. The capacitors must have enough high voltage rating to safely handle the input voltage feed to schema. The schema is very easy to build for example into a piece of veroboard.
5V Regulated Power Supply Circuit Diagram
Parts:C1 = 100uF-25V electrolytic capacitor, at least 25V voltage rating
C2 = 10uF-25V electrolytic capacitor, at least 6-16V voltage rating
C3 = 100nF-63V ceramic or polyester capacitor
IC = 7805 regulator IC
ICs Pinout :
- Unregulated voltage in
- Ground (See Diagram)
- Regulated voltage out
Circuit features:
- Gives out well regulated +5V output, output current capability of 100 mA
- Built-in overheating protection shuts down output when regulator IC gets too hot
- Very simple and easy to build
- Very stable +5V output voltage, reliable operation
- Easy to get components, uses only very common basic components
- Based on datasheet example schema, I have used this schema succesfully as part of many electronics projects
- Part of electronics devices, small laboratory power supply
- Wide range of input unreglated DC 8-24V power supply
- Few dollars for the electronics components + the input transformer cost
Modification Iideas
More output current:
If you need more than 150 mA of output current, you can update the output current up to 1A doing the following modifications.
- Change the transformer from where you take the power to the schema to a model which can give as much current as you need from output
- Put a heatsink to the 7805 regulator (so big that it does not overheat because of the extra losses in the regulator)
More output voltages:
If you need other voltages than +5V, you can modify the schema by replacing the 7805 chips with another regulator with different output voltage from regulator 78xx chip family. The last numbers in the the chip code tells the output voltage. Remember that the input voltage muts be at least 3V greater than regulator output voltage ot otherwise the regulator does not work well.
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