13
Now solder in the electrolytic capacitor C15 (100 µF). Observe
the mounting direction. The positive terminal is marked on the
board. The negative terminal – which is marked with a white
line – points towards the IC. Afterwards install the ceramic disk
capacitor C17 with 100 nF (print 104). The mounting direction
is not important.
The capacitors
Finally you have to build in the transistors. Take care not to mix
the types up. T1 is a PNP transistor BC557B, and T2 is an NPN
transistor BC547B.
The fully equipped PCB
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