Buffered 3340 Based VCO you can buy or build
https://aisynthesis.com/product/ai011-voltage-controlled-oscillator
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This VCO has been modified with a toggle switch on the back panel to allow for switching between audio oscillator and LFO modesI've been using it strictly as an LFO, without need to switch back-and-forth, but there's room at the top of the faceplate to mount the toggle, if the next owner wants to make it easier to toggle between modes on the flyLFO mode had all of the features and functionality of the VCO mode, just with slower oscillationsCompatible with the AI012 Wave Animator - (Not tested in LFO mode...)Manufacturer's description follows:The AI011 Analog VCO is a robust and stable analog Eurorack VCO. Using the legendary curtis 3340 IC, the Oscillator provides buffered Triangle, Square, and Ramp waveforms, as well as a triangle to sine wave shaper to provide a sine wave output.The Eurorack VCO features both Coarse and Fine tune knobs for easy tuning.Pulse Width Modulation is normalled to the PWM input jack, so PWM is controlled with the PWM knob, and when a jack is inserted, the knob serves as an attenuator.Volt per octave and FM input jacks are present, with an attenuator for FM modulation.The VCO is capable of both hard and soft sync.
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