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Universal Power Supply Board
With three user-defined output voltages
For the DDS Function Generator in the November & December 2015 edition a separate power supply section was designed that provides three different output voltages. The PSU board was designed such that it is easily adapted to supply other voltages. Here we describe a number of the potential configurations.
Component list
Component List
Resistors
R1–R6 = refer to Table 1 or equation in text
R7 = 10kOhm, 5%, 0.25W
Capacitors
C1,C2,C3,C4,C15,C16 = 10nF 50V, Y5V, 5mm pitch
C5 = approx. 2000µF per ampère of output current, working voltage see Table 1, 5mm or 7.5mm pitch, 16mm diam. max.
C6 = approx. 2000µF per ampère of output current, working voltage see Table 1, 5mm or 7.5mm pitch, 16mm diam. max.
C7,C8,C13,C14,C18,C21 = 100nF 50V, X7R, 5mm pitch
C9,C10,C11,C12,C19,C20 = 10µF 50V, 2mm pitch, 6.3mm diam. max.
C17 = 47µF 50V, 2.5mm or 3.5mm pitch, 8mm diam. max. (else fit beside PCB)
Semiconductors
D1–D7 = 1N4002 (up to 1A) or STTH2R06 (up to 1.5A)
IC1,IC3 = LM317, TO-220 case
IC2 = LM337, TO-220 case
LED1 = LED, green, 3mm
Miscellaneous
K1 = 2-way PCB screw terminal block, 7.5mm pitch
K2 = 4-way (2x2) PCB screw terminal block, 5mm pitch
TR1 = power transformer 2x115V prim. / 2x5V – 2x24 V sec., 10–30 VA, e.g. Block FL 10/15
F1 = fuse, 100mAT (230 VAC) or 200mAT (115 VAC) for powers <18W, 200mAT or 400mAT for greater powers
F2,F3 = glass fuse (for value refer to print on transformer)
Fuseholder for F1, F2, F3, 20x5mm, with cap
JP1 = wire link for AC line voltage selection (1 for 230 V, 2 for 115 V)
PCB # 150210-2
Resistors
R1–R6 = refer to Table 1 or equation in text
R7 = 10kOhm, 5%, 0.25W
Capacitors
C1,C2,C3,C4,C15,C16 = 10nF 50V, Y5V, 5mm pitch
C5 = approx. 2000µF per ampère of output current, working voltage see Table 1, 5mm or 7.5mm pitch, 16mm diam. max.
C6 = approx. 2000µF per ampère of output current, working voltage see Table 1, 5mm or 7.5mm pitch, 16mm diam. max.
C7,C8,C13,C14,C18,C21 = 100nF 50V, X7R, 5mm pitch
C9,C10,C11,C12,C19,C20 = 10µF 50V, 2mm pitch, 6.3mm diam. max.
C17 = 47µF 50V, 2.5mm or 3.5mm pitch, 8mm diam. max. (else fit beside PCB)
Semiconductors
D1–D7 = 1N4002 (up to 1A) or STTH2R06 (up to 1.5A)
IC1,IC3 = LM317, TO-220 case
IC2 = LM337, TO-220 case
LED1 = LED, green, 3mm
Miscellaneous
K1 = 2-way PCB screw terminal block, 7.5mm pitch
K2 = 4-way (2x2) PCB screw terminal block, 5mm pitch
TR1 = power transformer 2x115V prim. / 2x5V – 2x24 V sec., 10–30 VA, e.g. Block FL 10/15
F1 = fuse, 100mAT (230 VAC) or 200mAT (115 VAC) for powers <18W, 200mAT or 400mAT for greater powers
F2,F3 = glass fuse (for value refer to print on transformer)
Fuseholder for F1, F2, F3, 20x5mm, with cap
JP1 = wire link for AC line voltage selection (1 for 230 V, 2 for 115 V)
PCB # 150210-2
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