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Platino-based Experimenter’s Power Supply

A handy supply for the embedded electronics worker

Platino-based Experimenter’s Power Supply
Platino-based Experimenter’s Power Supply
Labs Project
Based on a Labs project | December 2013 | Find it here
Although many benchtop power supplies boast a microcontroller of some sort, the MCU’s function is usually limited to controlling the V/A readout. Not so in this project, which employs Elektor’s versatile ‘Platino’ ATmega powered board to do all of the PSU’s control functions, including its internal V and A regulation and fan control.
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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.

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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

Component list

Component List
Resistors
Default tolerance, wattage: 5%, 0.25 W
R1 = 240Ohm
R2, R15, R20 = 1kOhm
R3,R7,R12,R14,R19,R24,R25 = 10kOhm
R4 = 100kOhm
R5, R16 = 50mOhm shunt precision resistor, 1% 2W
R6 = 22kOhm
R8, R18 = 10kOhm 1%
R9, R23 = 100Ohm 1%
R10, R22 = 30kOhm 1%
R11, R17, R21 = 2kOhm 1 %
R13 = 4.7kOhm
P1 = 10kOhm trimpot
P2 = 50Ohm trimpot
Capacitors
C1,C3,C4,C9,C10,C12-C16,C18,C19,C20,C22-C27 = 100nF
C2 = 100µF 50V, radial
C5-C8 = 10µF 25V, radial
C11 = 1000µF 35V, radial
C17 = 100µF 25V, radial
C21 = 330µF 35V, radial
Inductors
L1 = 100µH, 1.4A (2062790)
L2 = 100µH, 2.6A (2215967)
Semiconductors
D1 = 1N5408
D2 = 1N5822
D3,D4,D6,D7 = 5.1V zener diode, 0.4W
D5 = 1N5819
D8 = 3.9V zener diode, 0.4W
T1,T2,T4-T6 = BS170
T3 = IRL540NPBF
IC1, IC2 = LM2576T-ADJ (Texas Instruments) (9488146)
IC3 = LM7805
IC4 = LM7812
IC5 = MAX660CPA+
IC6 = LM337LZ
IC7 = LM335
IC8 = MCP42010-E/P (Microchip) (1332110)
IC9, IC10 = LM358N
IC11 = LM336BZ-5.0
Miscellaneous
K1 = 2-way PCB terminal block
K5,K6,K8 = 2-pin pinheader
K2 = 8-pin pinheader
K3 = 12-pin pinheader
K4 = 6-pin (3x2) pinheader
K7 = 5-pin pinheader
Miniature fan, 12V, 40x40x15mm
2 pcs. banana socket, 1 red, 1 black, panel mounting (1176431) (1176430)
USB-A Socket, panel mounting (1667928)
Enclosure, 75x133x110mm, Bopla ref. 26160000 (1217479)
Switch, on/off, rocker, panel mount, e.g. Schurter ref. 1301.9205 (1162728)
PCB, Elektor Store # 130406
Platino board, Elektor Store # 110645
(numbers in round brackets are Farnell/Newark order codes)

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