This post covers New Systems Instruments Inertia in High range, i.e. for use as an oscillator or filter. For audio oscillation, mode is usually set to Skew, which allows frequency … Read More

The CubuSynth Engine is a dual analog VCO with wave shaping functions, internal modulations and a chaos generator. It is based around two CEM3340 VCO integrated circuits. This post is … Read More

After I built another Cell 90 case, I went a bit insane and spent days trying to fill it, balancing the tradeoffs of cost and functionality. Eventually the dust started … Read More

Peter Blasser put bounds modulation capability into many of his oscillators. But what is it? Consider an oscillator that bounces back and forth between an upper voltage and a lower … Read More

Features Four oscillators with independent controls and outputs Saw, Triangle, Ramp variable shape output Pulse output with variable width Rise rate pot and CV input Fall rate pot and CV … Read More

I built this nice through-zero VCO from Weston Precision Audio. Features:Thru-Zero Linear Frequency Modulation5 wave shapes: Sine, Triangle, Sawtooth, Square, & PulseExtremely good tuning linearity (<+/-5cents over 10 octaves)Built-in high … Read More

My recent build of a Befaco Rampage prompted me to revisit several variations of the Serge Dual Universal Slope Generator that I have in Eurorack: Befaco Rampage, Random*Source DUSG, Steady … Read More

The Dannysound EN129 Thru-Zero Oscillator is one of a pair of DIY only oscillator kits from Thonk.  See my post about the Cali Osc, too. The EN129 Oscillator is based … Read More

I had been experiencing pitch instability on my 258J VCOs. It seems that the frequency pots had become scratchy, because by rotating them a few times the instability would stop. … Read More

The Dannysound Cali Osc is one of two new, analog VCOs available from Thonk only as DIY kits. The Cali oscillator is a new and improved version of the classic … Read More