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Module A-111-3 is an extremely space-saving precision VCO/LFO with a 4HP panel only. Essentially it's the same basic circuit as the A-111-2 but with reduced features: triangle core fully analog design min. 15 octaves pitch range in each mode (VCO/LFO): VCO mode: typ. 0.5 Hz - 20 kHz (with appropriate external CV) LFO mode: typ. 0.001 Hz - 40 Hz (with appropriate external CV) range switch so that the module can be used as VCO or LFO (in LFO mode all frequencies about 1/500 compared to VCO mode) about 24 octaves total in both modes (typ. 0.001 Hz - 20kHz) perfect 1V/octave tracking over min. 10 octaves (typ. 16Hz - 16kHz in VCO mode) exponential frequency section: Tune control selectable tune control range by means of an internal jumper: about 0.5 / 2 / 10 octaves manual VCO tune range (with jumper pos. 1, without external CV): about 16 Hz- 20kHz manual VCO tune range (with jumper pos. 2, without external CV): about 16 Hz- 70Hz manual VCO tune range (without jumper, without external CV): about 16 Hz- 22Hz if desired the min. frequency can be adjusted by the user (frequency offset trimming potentiometer, see note below) the corresponding frequencies in LFO mode are about 1/500 lower, the max. frequency in LFO mode is about 40Hz 1V/octave CV input "1V" exponential frequency modulation XM input with attenuator the XM input socket is normalled to a small positive voltage so that the XM control works as fine tune control when exponential FM is not in use. As a logarithmic potentiometer for finer resolution in the lower range is used, also the fine control is exponential (thank's to Václav of Bastl Instruments for this tip at Superbooth in Berlin) access to internal bus CV (via jumper, optional, please remove the bus jumper if this feature is not used to avoid unwanted frequency modulation as then the unused CV line of the bus works as a kind of antenna) linear frequency section: linear frequency modulation input LM (without attenuator), DC coupled Pulsewidth section for rectangle output: Manual pulsewidth control PW, adjusts pulsewidth from 0% (output = fixed at "low" state) up to 100% (output fixed at "high" state) Pulsewidth modulation input PM (without attenuator), about 5Vpp required for full PW range Sync input SY (selectable hard or soft sync via internal jumper, CEM3340 hard sync type) Waveform outputs: Sawtooth, rising edge, output level ~ 10Vpp (voltage range 0 ... +10V, can be modified for -5V...+5V, see A111_3_trimming_potentiometers_and_jumpers.pdf for details) Rectangle (controlled from pulsewidth section), output level ~ 10Vpp (voltage range 0 ... +10V) Triangle, output level ~ 10Vpp (voltage range -5V ... +5V, DC offset can be adjusted also also to 0 ... +10V, see A111_3_trimming_potentiometers_and_jumpers.pdf for details) Nearly "perfect" waveforms LED (for display in LFO mode) only 4HP panel


Behringer Neutron! Semi modular

...kind of accepted that now, and moved on. My KARP module doesn't do it, and neither does my CEM based Doepfer A-111-3, so my feeling is that the Neutron shouldn't do it either, but I guess it just does, and that's all there is to it. I can live with it. Possibly it is EM...

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Behringer Model D - DIY Mods

...I like the idea of being able to modulate PWM. It's one of my favourite features of my Doepfer A-111-3 VCO. Is the CV going to the point between the 7k5 and the 1k resistors, in your diagram, effectively? I've considered whether it would be worth adding a waveform mixer, but it would...

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Behringer Neutron! Semi modular misbehave then cut out, when the batteries need changing (when I use my main modular stuff)... My Doepfer A-111-3 VCO also tends to go really flat just before that. For my purposes, that's fine - it just means it's time to change the batteries. I keep a few sets charged...

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