The following videos will show you how to build a variety of simple musical circuits. I have found these circuits offer a good balance of relatively easy construction and practical usability in the studio.  
In these videos I use the OMSynth to build and perform with the circuits BUT all of the examples can be easily built using standard breadboards and electrical components. The OMSynth makes the process easier but is by no means necessary.
These videos were produced during the summer of 2015 in Slovenia at <a href="http://wiki.ljudmila.org/Naslovnica">Ljudmila</a>.

VIDEO 1: OSCILLATORS
VIDEO 2: SEQUENCERS (coming soon)
VIDEO 3: LO-FI SAMPLER & LOOPER (coming soon)