Elektor 150189-1, Инструкция по сборке

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Mount the bipolar transistors T1 ... T4, T8
(MPSA42) and T9 (BC557B). For esthetical
reasons and to facilitate mounting, the top of
the transistors should be flush with the top of
the pin and socket headers.
Mount the terminal block K2 and electrolytic
capacitor C18 (220 μF 16 V). Watch the polarity!
Mount the electrolytic capacitors C11, C12 (100
μF 25 V) and C13 (10 μF 25 V). Watch the
polarity.
Mount the red LED LED1. Watch the polarity!
The longest lead should go in the hole closest to
R12. Keep the soldering time as short as
possible as some LEDs are easily damaged by
excessive heat.
Mount the power inductor L1 (100 μH). It is
highly recommended to mount the inductor so
the start of the windings marked by a white dot
is connected to the switching node (D1 and T5).
As such, the outer windings on the ferrite core are connected to the power supply rail and act as
an EMI shield.