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Slow-Start Stabilizer

Slow-Start Stabilizer
Your everyday 7805 regulator is not the best choice for powering accurate measurement circuits and A/D converters, mainly because it generates too much noise and exhibits spurious behavior at power on. The circuit described here meets all conditions mentioned and can easily serve as a replacement for an ordinary 7805
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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.

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Resistors (SMD 1206)
R1 = 3.3kOhm
R2 = 3.09kOhm
R3 = 2.2kOhm
R4 = 1kOhm
C1,C4 = 100nF (SMD 1206)
C2 = 470nF (SMD 1210)
C3 = 10µF 16V (SMD 1210)
C5 = 22µF 10V (SMD 2312)
D1,D2 = LL4148
D3 = LED, low current, shape 1206
D4 = LL4150
IC1 = MIC2941AWU TR (TO-263)
EMI suppression filter type DSS6NE52A222Q55B (Murata)
PCB # 130173-1, see [1]

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