Laboratory Power Supply
Laboratory Power Supply
Embedded Files
This is a useful power supply based on an ebay kit for the power supply circuit, and a custom made current/voltage meter + controller circuit. The design and build process is fully explained in an instructables article.
The output voltage is ~ 24V and the maximum current 3A, although the current regulation has a little bit of ripple, the power supply is sturdy and good for general purpose usage. Also, the meter circuit is relatively precise: 10mV/1mA.
The display shows the voltage and current as a number and also as a progress bar relative to the OV or OC setup.
The meter and controller circuit has a relay and is able to break the output circuit automatically under Over Voltage or Over Current conditions.
Wiring diagram:
Wiring diagram:
Parts
Parts
- 1: 4x20 I2C LCD Display "2004".
- 2: Two 10K, 270º, linear potentiometers: The ones that come with the power supply kit (8).
- 3: Push button Red: Digikey - EG2045-ND . Push button Black: Digikey-EG2041-ND .
- 4: Binding Posts
- 5A: Arduino R3
- 5B: Custom Meter Circuit
- 6: Power Jack with cable for Arduino
- 7: Two multiturn, linear, 10k pots.
- 8: Power supply kit
- 9: Transformer: Digikey - 595-1088-ND
- 10: IEC Panel Male Plug with fuse holder.
- 11 Main switch: Digikey - EG4397-ND
- 12: 2SD1047 power transistor from power supply kit (8).
- 13A: Heatsink
- 13B: Insulator
- 14: Aluminium Enclosure
- A: Thick 750V cable.
- B: Thin Cable.
- C: IEC power cord USA
- C: IEC power cord UK
- C: IEC power cord EU
- D: Potentiometer knobs 6mm hole
- D: Potentiometer knobs 6.35mm (¼”) hole
- D: Potentiometer knobs 6mm
- E: Tall nylon mounting spacers
- F: Dry transfer letters
- G: 3/16" Faston terminal
- H: Terminal lug
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