A-143-4 is a fourfold voltage controlled low frequency oscillator (LFO). As the frequency range includes moderate audio frequencies it can be used as a four-fold VCO too.
- Four independent VCLFOs/VCOs with triangle core
- Frequency range switches: low (bottom position) = LFO mode, high (top position) = VCO mode
- Two frequency control CV inputs for each unit
- CV1 without attenuator (~ 1V/oct)
- CV2 with attenuator
- Manual frequency control
- Internal jumpers for the frequency range of the manual frequency controls:
- Jumper not installed: ~ +/- 1 octave range (mainly for VCO applications)
- Jumper installed: ~ +/- 5 octaves range (mainly for VCLFO applications)
- Combined Reset/Direction inputs for unit #1 – #3
- Separate Reset and Direction inputs for unit #4 (normalled sockets, i.e. Reset is connected to Direction if the Direction socket is unused)
- Up/both/down direction switch for unit #4, for technical details concerning the Reset and Direction function please refer to the sketch below
- Triangle and rectangle outputs for each unit
- Typ. output voltage range -5V … +5V for both outputs (i.e. about 10 Vpp, symmetrical with reference to 0 V)
- Red/yellow LED displays for the triangle outputs (red = negative output voltage, yellow = positive output voltage)
- Common control section with two CV inputs and manual control (these inputs and controls affect the frequency of all four units)
- sum outputs for triangle and rectangle with red/yellow LED displays
- optional ultra-low frequency mode: for this a negative voltage can be applied via a jumper internally to the CV2 input of each unit and the common section (i.e. a negative voltage is normalled to the socket CV2 in question). Then the CV2 attenuator control works as a negative frequeny control (i.e. turning up this control lowers the frequency). Herewith LFO periodes up to about one hour (or even more) are possible.
- typ. frequency range: < 0.001 Hz (~ one hour, LFO mode with ultra-low option) … 15 kHz (VCO mode with installed frequency range jumpers for the manual frequency controls)
- heat-up time: ~ 15 minutes (required to heat-up the main circuit by the affixed oven)
Specifications
- Width: 22hp
- Depth: 60mm
- Power: +25mA / -29mA
