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Versatile Power Supply for Breadboards

Positive and Negative Voltages Out of 5 V from USB

Versatile Power Supply for Breadboards
Versatile Power Supply for Breadboards
Breadboard power supplies are useful when no desktop lab power supply is available. Most of the modules on the market are limited to positive output voltages, lower than the input voltage. The project we present here is different. With the help of two integrated circuits from Maxim, a 5-V micro-USB adapter at the input provides up to four adjustable output voltages, three positive ranging from 0.6 V to 20 V and one negative from -1.8 V to -11 V.
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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.

Elektor recommends the Elektor PCB Service service from its business partner Eurocircuits or AISLER as the best services for its own prototypes and volume production.

The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Components

The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
Want to learn more about our BOM list? Read the BOM list article for extra information.

Download the BOM list

Component list

Component list

Resistors (size 0603, unless otherwise stated)

R1 = 39 k

R2 = 27 k

R3 = 120 k

R4 = 33 k

R5,R6,R8 = 4k7

R7 = 68 k

P1,P3 = 500 k multi-turn trimmer (Vishay style 24 W)

P2 = 200 k multi-turn trimmer (Vishay style 24 W)

 

Inductors

L1,L2 = 10 µ, 1 A (Fastron 242408FPS)

 

Capacitors

C1,C2 = 10 µ, 16 V X5R size 0805

C3,C4 = 4µ7, 50 V X7R size 1206

C5,C6,C8 = 1 µ, 16 V X7R size 0603

C7 = 220 n, 16 V X7R size 0603

C9 = 4µ7, 25 V X5R size 0805

C10 = 100 n, 16 V X7R size 0603

C11,C12 = 100 n, 50 V X7R size 0805

 

Semiconductors

D1,D2 = Schottky diode 40 V/1 A PMEG4010, SOD-323

LED1 = low-current LED 3 mm, green

LED2,LED3 = low-current LED 3 mm, red

IC1 = Dual-Output (+ and -) DC-DC Converter MAX8614BETD+

IC2 = 1.7 –5.5 VIN, 1 A adjustable LDO MAX38903BATB+

 

Miscellaneous

J1,J2 = pin header 2 x 2 pins (pitch 100 mil)

JP1 = pin header 2 x 3 pins (pitch 100 mil, see text)

K1 = micro-USB connector,  Amtek MIUSB-F5M-AGB-U

S1 = slide switch SDPT, NKK Switches CS12ANW03

jumper cap for JP1

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