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Doepfer A-111-6V Vintage Mini Synth


Doepfer A-111-6V Vintage Mini Synth

Doepfer A-111-6V Vintage Mini Synth


Module A-111-6 contains a complete, monophonic synthesizer with VCO, VCF, VCA and envelope generator with these properties:
( bold = control element or socket)


  • Triangle core
  • Frequency range: approx. 32 Hz ... 16 kHz
  • Precise 1V / octave tracking: approx. 32 Hz ... 4 kHz
  • Tune: manual control for the pitch adjustment, range can be selected with a jumper between approx. +/- 0.5 octaves or approx. +/- 2 octaves
  • Oct. : Range switch -1 / 0 / +1 octave
  • Mod .: Modulation depth (attenuator connected to the Mod. Socket )
  • Dest .: Toggle switch for addressing the modulation as frequency modulation (position FM ) or pulse width modulation (position PM ), neither of the two modulations is active in the middle position
  • PW: manual controller for the pulse width from 0% / output permanently to "low" up to 100% / output permanently to "high"
  • Wave : Waveform switch (sawtooth / off / triangle), the sum signal from the waveform that is selected with this switch, and the square wave signal is used as an input for the VCF (to switch off the square wave, the PW controller is set to the left or right stop )
  • 1V / Oct. (Socket): external control input with 1V / octave for the VCO frequency
  • optional access to the internal bus CV via jumper (please remove the jumper if this function is not used to avoid unwanted frequency modulations, since the unconnected CV line of the bus board acts as a kind of large antenna)

Balance unit

  • The balance unit consists of two oppositely controlled VCAs
  • the balance control signal consists of the sum of the manual balance controller Bal.  and the control input CV Bal.
  • The audio input of the first VCA is fixedly connected to the VCO output which is the second VCAs with the socket Ext. In connected
  • this is normalized to the internally generated suboctave signal f / 2, ie if there is nothing in the Ext socket . The second VCA receives the suboctave signal
  • The output of the balance unit is the audio input of the VCF.
  • Bal .: manual balance control, left stop, the VCO signal at the right stop on the bushing Ext. In use the signal applied from audio signal to the VCF, to the middle position, both signals have approximately the same level
  • CV Bal. : Balance control input (range approx. 0 ... + 5V for the entire range when the balance control is at the left stop)
  • Ext. In : External audio input VCA2, approx. 5 Vss level required, so that VCO and external signal have approximately the same volume. Possibly. an attenuator can be connected upstream ( e.g. A-183-1 ), normalized to the internally generated suboctave signal f / 2


  • 24 dB low pass
  • Frequency range approx. 10 Hz ... 20 kHz
  • Manual controller Frq. for setting the cut-off frequency (corner frequency) of the filter by hand.
  • Two inputs FM1 and FM2 for controlling the filter frequency with external control voltages
  • FM1 is equipped with an attenuator and the internally generated envelope signal ( envelope normalized), that is, unless a different control signal to the socket FM1 is applied controls the controller FM1 the intensity of the envelope for controlling the filter frequency
  • FM2 has no attenuator and has approximately a control characteristic of 1V / octave, the FM2 socket can be normalized with a jumper to the 1V / Oct socket of the VCO (i.e. if no other control signal is applied to the FM2 socket , the frequency of the VCF follows that of the VCO, so-called filter tracking)
  • This can be used, for example, to implement filter tracking (ie that the frequency of the filter follows that of the VCO by also supplying the control voltage supplied to the VCO to the FM2 socket)
  • Manual controller Res. For the resonance of the filter, the resonance extends to self-oscillation, so that the filter can be used as a sine oscillator, for this the VCO can be switched off
  • Optional access to the internal bus CV via jumper for bus-controlled filter tracking (please remove the jumper if this function is not used to avoid unwanted frequency modulation, since the unconnected CV line of the bus board acts as a kind of large antenna)


  • Manual setting of the basic gain (Initial Gain) with the Gain control, with this the VCA can also be opened without an envelope signal
  • Toggle switch for switching the VCA control between gate and envelope (envelope), in the middle position the VCA is neither controlled via the gate nor the envelope, in this case the VCA volume is only determined by the manual gain control
  • Note: If the VCA is controlled directly via the gate signal, the inter certain conditions can lead to crackling noises, since the VCA opens and closes "hard" (especially at low VCO frequencies or dull signals) with the help of a jumper the rise and fall time of the gate signal used for VCA control can be increased in order to avoid the aforementioned cracking noises (additional slew limiter), but in return the gate signal then no longer acts as "crisp" "on the VCA, slew limiting affects only the internal gate signal processing and has no influence on the externally applied gate signal 
  • the VCA has a special characteristic: exponential from approx. - 90dB to   - 20dB, linear between approx. - 20dB and 0 dB, this characteristic results in a volume behavior that deviates from the usual behavior of a linear or exponential VCA
  • Out : audio output of the module (= VCA output)


  • Operating mode switchable with a toggle switch between AD (Attack-Decay), ADSR (Attack-Decay-Sustain-Release) and AR (Attack-Release)
  • In ADSR mode, the sustain level is fixed at 50% and the parameters decay and release are the same
  • Gate (socket): level min. + 5V, a jumper is used to determine whether the gate signal of the backplane should be used to control the envelope
  • Att : Manual control for attack
  • D / R : Manual control for decay / release
  • Envelope (socket): Envelope output (approx. + 10V)
  • CVT (socket): Time control input, with the help of two internal jumpers (jumpers) it can be determined which of the time parameters are controlled via the CVT input (e.g. only D / R or only A or A + D / R) and in which direction the control takes place, ie whether an increasing control voltage increases or decreases the times
  • LED display (shows the envelope curve)
  • Attack time range: approx. 1 ms ... 5 sec (can be expanded significantly via the CVT input)
  • Decay / release time range: approx. 1ms ... 15 sec (can be expanded significantly via the CVT input)

The controls are arranged a little closer than the standard modules and smaller, rubberized knobs are used. The front panel is only 10 TE wide. The module is primarily intended for applications in which little space is available. The module can be considered the compressed version of the  A-111-5 Synthesizer Voice.

The following document shows the positions and functions of the trim potentiometers and jumpers: A111_6_trimming_potentiometers_and_jumpers.pdf . As a precaution, we would like to point out that incorrect adjustments caused by the customer changing the trim potentiometer settings are not covered by the guarantee. In this case we may have to invoice the working time for the readjustment of the module!