Ton  Giesberts
About the article

VariLab 402 (1/3)

VariLab 402 (1/3)
No electronics lab is complete without a solid power supply. It has to be reliable, and must do exactly what you want without causing any problems or being upset by sudden load changes. The lab power supply described here features two-stage regulation with switching and linear stages, along with a wide output voltage range from 0 to 40 V.
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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.

Components
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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.
Component List
Resistors
R1 = 1.54kOhm 1%, 125mW
R2 = 52.3kOhm 1%, 125mW
R3,R18,R19,R56 = 100Ohm 1%, 125mW
R4 = 51kOhm 1%, 125mW
R5,R29,R34,R46,R52 = 10kOhm 1%, 125mW
R6 = 1.2MOhm 1%, 125mW
R7,R8,R21,R32 = 10Ohm 1%, 125mW
R9 = 0.01Ohm 5%, 1 W (TE Connectivity/CGS CGSSL1R01J)
R10,R11 = 2.7Ohm 1%, 125mW
R12 = 3.9Ohm 5%, 125mW
R13 = 10Ohm 1%, 0.75W (Vishay Draloric CRCW201010R0FKEF, 2010)
R14 = 47kOhm 1%, 125mW
R15,R24,R36,R44,R45 = 1kOhm 1%, 125mW
R16 = 3.3kOhm 1%, 1W (Multicomp, RCL1218 3K3 1% 100 PPM/K E3, 1218)
R17 = 0.05Ohm 1%, 1W (Bourns, CRM2010-FZ-R050ELF, 2010)
R20,R23,R25,R26,R31,R47,R59 = 2.00kOhm 1%, 125mW
R22 = 44.2kOhm 1%, 125mW
R27 = 6.04kOhm 1%, 125mW
R28,R39 = 4.7kOhm 1%, 125mW
R30,R58 = 18.0kOhm 1%, 125mW
R33 = 1MOhm 1%, 125mW
R35,R43 = 3.3kOhm 5%, 125mW
R37 = 200Ohm 1%, 125mW
R38 = 470Ohm 1%, 125mW
R40,R41 = 1.5kOhm 5%, 125mW
R42 = 1.8kOhm 5%, 125mW
R48 = 16.9kOhm 1%, 125mW
R49 = 15kOhm 5%, 125mW
R50 = 47Ohm 5%, 125mW
R51 = 2.2kOhm 5%, 125mW
R53,R55 = 100kOhm 5%, 125mW
R54 = 820Ohm 5%, 125mW
R57 = 0.22Ohm 5%, 5 W (TE Connectivity/CGS, SMW5R22JT, SMW5R22JT)
P1 = 2kOhm 10%, 0.5 W, 25-turn trimpot, top adjustment (Bourns 3296Y-1-202LF)
P2,P4 = 500Ohm 10%, 0,5 W, 25-turn trimpot, top adjustment (Bourns, 3296Y-1-501LF)
P3 = 1kOhm 10%, 0.5 W, 25-turn trimpot, top adjustment (Bourns, 3296Y-1-102LF)
Capacitors
Default: SMD 0805
C1 = 2.2nF 50V, 5%, C0G/NP0
C2,C26 = 470µF 63V, 20%, ESR 0.027 Ohm, IAC 2A (Panasonic EEUFR1J471)
C3,C9 = 1µF 16V, 10%, X7R
C4,C10,C45 = 470nF 25V, 10%, X7R
C5 = 47nF 50V, 10%, X7R
C6 = 15nF 50V, 10%, C0G/NP0
C7,C8,C12,C20,C48 = 1nF 100V, 5%, C0G/NP0
C11 = 1µF 100V, 10%, X7R (Murata GRM32CR72A105KA35L, 1210)
C13 = 1000µF 63V, 20%, D 16mm, 7.5mm pitch, IAC 2.77 A (Panasonic EEUFC1J102)
C14,C15,C16,C18,C23,C24,C25,C27,C28,C29 = 2.2µF 100V, 10%, X7R (TDK C3225X7R2A225K, 1210)
C17 = 47µF 50V, 20%, D 10 mm, 5mm pitch, ESR 29mOhm (Nichicon PLX1H470MDL1TD)
C19,C30,C31,C49,C50 = 100nF 25V, 10%, X7R
C21,C22,C47 = 10nF 50V, 10%, X7R
C32,C33 = 47µF 35V, 20%, 2.5mm pitch
C34,C35,C38,C39 = 100nF 63V, 5%, 5/7.5mm pitch
C36,C44 = 1000µF 25V, 20%, D 10mm, 5mm pitch, ESR 0.02Ohm (Panasonic EEUFR1E102)
C37 = 220µF 25V, 20%, D 8mm, 3.5mm pitch, IAC 950 mA (Panasonic ECA1CM221)
C40–C43 = 10nF 100V, 10%, 5mm pitch
C46 = 470pF 100V, 10%, X7R
C51,C52,C54 = 100nF 100V, 10%, X7R
C53 = 10µF 63V, 20%, D 6.3mm, 2.5mm pitch (Rubycon 100YXF10MEFC6.3X11)
Inductors
L1 = 82µH, 7A, SMD, high-current, RDC 30.4mOhm (Würth Elektronik 74435588200)
L2 = 10µH, 7.2A, SMD, high-current, RDC 16.3mOhm (Würth Elektronik 7443251000)
L3 = 10µH, 950 mA, radial, 2mm pitch, RDC 0.14Ohm (Murata Power Solutions 11R103C)
L4 = 70Ohm @ 100MHz, 3.5 A, 0.022Ohm, 0603 (Murata BLM18KG700TN1D)
Semiconductors
D1 = PMEG6010CEH (SOD-123F)
D2,D3,D4 = BAT85W (SOT-123)
D5 = LED, red, 3mm, leaded
D6 = LED, green, 3mm, leaded
D7,D8,D11,D12,D13 = PMEG6030EP (SOD-128)
D9 = 4.7V 500mW zener diode (SOD-123F)
D10 = 10V 3W zener diode (SMB)
B1 = 50V 1.5A bridge rectifier (Multicomp AM150)
T1,T2 = PSMN5R5-60YS (LFPAK/SOT669)
T3 = BC817-25 (SOT-23)
T4 = AUIRF9540N (TO-220)
T5,T6 = BC807-40 (SOT-23)
T7 = PMBFJ110 (SOT-23)
IC1 = LM5117 (MXA20A)
IC2 = LM6134 (SO-14)
IC3 = LT6105 (MSOP-8)
IC4 = LM336Z-2.5 (TO-92)
IC5 = 7805 (TO-220)
IC6 = 7905 (TO-220)
IC7 = OPA552UA (SO-8)
Miscellaneous
K1,K2 = 2-way PCB screw terminal block, 5mm pitch
K3 = 14-pin boxheader, 0.1”pitch
K4,K5 = 2-way PCB screw terminal block, 7.5mm pitch
K6,JP1,JP3,JP6 = 2-pin pinheader, 0.1”pitch
JP2,JP4,JP5 = 3-pin pinheader, 0.1”pitch
JP1–JP6 = jumper 0.1”pitch
S1 = pushbutton 6x6mm SPST-NO (TE Connectivity/Alcoswitch FSM4JH)
F1 = 1AT (slow) fuse with PCB mount fuse holder and cap
TR1 = power transformer, PCB mount, prim. 2x115V, sec. 2x9V, 3.2VA (Block AVB3.2/2/9)
HS1 = heatsink, PCB mount, e.g. Fischer SK 129 38,1 STS, 6.5 K/W
Power Supply Module 48V 3A, e.g. Mean Well S-150-48
PCB # 120437-1

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