A-188-9 High Speed VCO / Audio VCO

Doepfer A-188-9

The Doepfer A-188-9 High-Speed VCO provides rock-solid tracking of volt-per-octave control signals which remain precise even at very high frequencies, perfect for driving high speed inputs on other modules. With a two-position range switch, the A-188-9 can provide stable tracking from 12Hz to a soaring 450kHz, suitable for both traditional audio oscillator duties as well as clocking BBD modules, clock dividers, and other high-speed inputs. The circuit combines a precision VCO with a phased-locked loop to multiply the VCO frequency by a factor of thirty-two, with a slew limiter that adjusts the tracking speed of the PLL with a three-position switch.

Multiple waveform outputs provide flexibility in patching, with square, sawtooth, and triangle waveforms. At the bottom-right of the module, a dedicated high-speed output is provided, which can be used simultaneously with the audio VCO outputs in HSVCO mode. In addition to inputs for 1V/octave control and an attenuated CV input, a manual control for pulse width of the square output is available. If you're in need of a stable clocking source for high speed inputs that also offers flexible operation as a rock-solid analog VCO, the Doepfer A-188-9 High-Speed VCO will make a perfect addition to your system.

A-188-9 Features

• Precision VCO with stable V/Oct control at high frequencies
• Useful for clocking BBD modules and other high speed inputs
• Frequency range switch offers VCO and High-Speed VCO modes (HSVCO)
• Total frequency range without external CV: 12Hz - 450kHz
• Square, triangle, and sawtooth audio VCO outputs
• PWM control over square wave output
• High-speed VCO output useable in HSVCO mode
• Slew time switch adjusts speed of PLL tracking for high-speed output