Various electronics DIY projects, mostly related to audio. Alembic F2B two channel tube preamp, based on a typical Fender preamp stage, for bass and guitar Pedal board for effects pedals 8 channel motorized fader DAW controller emulating Mackie Control protocol, based on midibox.org MidiBox LC Active transformer-coupled DI box (design by Bo Hansen) Green 4 channel microphone preamplifier