Optical auto-Volume with dual FX-Loop mode
"Little FET Booster" Amplifier Driver JCM(c)2007 Ĩx opto-cell (2x4) op-amp Stereo Vibe-Phasor with accurate replication of Univibe Range and AC-Response
Linear Dynamic-Locked-Loop - A Brief Description. but that's easy to fix if you don't want it, simply stick capacitance from each op-amp supply pin to gnd - I recommend using a 10uF to 1000uF electro at 25v and 0.1uF ceramic in parallel for good decoupling. Note: a little bit of RF can creep into the circuit if not decoupling the supply rails - to me it's more interesting this way (it's a hobby, why not ?). off-setting toward higher gain levels allows for more dirty (clipped) waveforms with more "gripping" quality, and better lock-in - ie., little to no glitching with FREQ sweep. Tuning the Shape control gives a more constant output signal amplitude to FREQ pot sweep and a cleaner sine wave-shape, though seemingly at the expense of lock-in times as the oscillator becomes glitchy when sweeping the FREQ pot. if you're gonna box this thing up you may want to replace the Shape/Gain trimmer by a pot. the circuit uses common parts: Radio Shack 272-1139 (1.5v 25mA) or 272-1140 (6v 25mA) bulb, a 1k trimmer (for setting circuit gain and distortion levels), most any standard op-amp, two 0.22uF Ceramic caps, a dual 50k LIN pot, two 9volt batteries a 5k to 100k output volume pot. Simple Audio Range Sine-wave Oscillator with Shape Control JCM(c)2008Īs far as a quick and dirty audio rate oscillators go it's my favorite, great for testing audio equipment or as an interesting live instrument (great for exploring the chromatic continuum). "Super-MOJO II" Linear Dynamic Booster // Tube Amp Feedback Sustainer JCM(c)2008 "MOJO" class-A Exaggerator Dynamic Booster-Compressor // Thermionic Transfer Replicator JCM(c)2008 "Opto-Vibe" Super Wide-Range Univibe re-Design JCM(c)2009 the circuit was designed for a buddy who's in the studio this summer doing strange and wonderful things with his Bass. the youtube video below features the second prototype leading to the final version and shows this clearly. This "clock-less" output translates visually on a scope as a disappearance of sharp glitches usually seen at the boundary between sampled voltages. Linear Clock Nulling in Action (clip) JCM(c)2010 ok, perfect clock fundamental nulling with very slight feedthgrough of clock harmonics. a recent conceptual discovery has lead me to a circuit which gives near-total clock nulling. the interesting thing about the Nyquist Aliaser is that this switchign noise could be minimized by varying the channel DC voltage - but unfortunately not cancel it out by a long shot. this typically introduces a "pulse noise" on the channel voltage whenever the sampler takes a snapshot. My original Aliaser circuit centered around the typical "switched-gate jFET pass-transistor into a cap" idea, where a sharp pulse drives the gate voltage well above and well below the mean Drain-Source channel voltage.
"Bleeding Aliaser" Updated Sampler with Effective Clock Nulling JCM(c)2010 "360 Stand-Alone" Stereo Guitar/Bass Fuzz with Presence and Blend JCM(c)2010 "Octave Amp" High Precision Rectifying Octaver JCM(c)2010 \\\ Original Analog Bass/Guitar Effects and DIY /// \\\ Analog Bass/Guitar Effects and DIY /// Custom/Original Designs