Electronic Load Resistor
An Out-of-the-Box Project

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Component list
Component List Control Circuitry
Resistors:
(all 1/4 W, unless otherwise specified)
R1…R4, R36…R38 = 10 k
R5…R12 = 0Ω150 / 5 W
R13, R14, R18, R19, R23…R26 = 18 k
R15, R16 = 3k3
R17 = 150 k
R20, R30, R39 = 1 k
R21 = 2k4
R22 = NTC 6k8 with screw mounting
R27 = 4k3
R28 = 39 k
R29 = 6k8
R31 = 22 k
R32 = 33 k
R33 = 470 k
R34, R41 = 82 k
R35 = 120 k
R40 = 1k2
P1 = pot 25 k
P2 = trimming pot 100 k
P3 = trimming pot 100 k
Shunt resistors for ammeter, depending on type
Capacitors:
C1…C3 = 100 nF
C4 = 47 µF/25 V
C5 = 100 µF/25 V
C6 = 15 nF
C7 = 47 nF
Semiconductors:
D1 = Z-Diode 15 V
D2 = 1N4148
D3 = 1N4001
LED1 = LED 5 mm yellow
LED2 = LED 5 mm green
LED3 = LED 5 mm red
T1…T4 = IRF740
T5 = BD677
IC1, IC2 = LM324
IC3 = LP2950-CZ3,3
Miscellaneous:
S1 = toggling switch 1×
F1 = fuse 10 A with holder for front panel
K1, K2, K6, K7 = 1×3-pin header with plug
K3 = 1×2-pin header with plug
K4 = 1×4-pin header with plug
K5 = 1×5-pin header with plug
Component List Voltage Inverter
Resistors:
R42 = 1 Ω
R43 = 4k7
R44 = 1 kΩ
R45 = 10 Ω
Capacitors:
C8 = 1000 µF/25 V
C9 = 1n5
C10, C11 = 1000 µF/16 V
Inductance:
L1 = 100 µH
Semiconductors:
D4 = 1N5819
IC4 = MC34063
Miscellaneous:
K8 = socket for coaxial power connector
Plug-in power supply 12 V with a minimum of 0.5 A load capacity
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