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Universal Symmetric Power Supply

Universal Symmetric Power Supply
This power supply has been specially designed for the 20th-order filter described elsewhere in this issue, but it can also be used for a legion of other opamp circuits. The supply voltage is set to ±17.5 V, in light of the maximum output level of the filter. This benefits the signal to noise ratio. The specified absolute maximum supply voltage for most opamps is ±18 V, and we have intentionally kept a bit below this limit.
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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.

R1,R3 = 249? 1%
R2,R4 = 3k?24 1%
R5 = 8k?2
C1,C2,C7,C8 = 100nF ceramic
C3...C6 = 10µF 63V radial
C9,C10 = 220µF 40V radial
C11-C14 = 22nF ceramic
C15,C16 = 100nF 275VAC class X2
L1 = 2x27 mH (e.g., Siemens type B82721-K2401-N21) (Electrovalue)
D1 = high-efficiency LED
IC1 = LM317T (TO220 case)
IC2 = LM337T (TO220 case)
K1 = 2-way PCB terminal block, raster 7.5mm
B1 = B80C1500, rectangular case (80V piv, 1.5A peak)
F1 = fuse, 32mA slow, with PCB mount holder and cap
Tr1 = mains transformer, PCB mount, secondary 2x18 V/4VA (e.g., Hahn type BV UI 302 0156)
PCB, order code 004064-1
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