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Platino-based Experimenter’s Power Supply

A handy supply for the embedded electronics worker

Platino-based Experimenter’s Power Supply
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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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor 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 its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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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