doepfer/a-126-2
A-126-2
Capabilities 1
- Frequency Shifterfrequency-shifter
- 363
Jacks 9 — 6 in / 3 out
| Name | Signal | Voltage | Description |
|---|---|---|---|
| Inputs (6) | |||
| Audio In | audio | — | Audio input with attenuator (Level knob). Typical input level 1Vpp. Adjust Level so overload LED just begins to light; full LED = clipping, permanently off = level too low.363 |
| Cos (input) | audio | — | External cosine input for an external quadrature VCO. Normalled to the internal quadrature VCO. Expected level ~10Vpp (8–10Vpp OK), must be zero-symmetrical.363 |
| FCV In | cv | — | CV input with attenuator for external voltage control of the shifting frequency.363 |
| Mix CV In | cv | — | CV input with attenuator for external voltage control of the up/down shift mixing ratio.363 |
| Sin (input) | audio | — | External sine input for an external quadrature VCO. Normalled to the internal quadrature VCO. Expected level ~10Vpp (8–10Vpp OK), must be zero-symmetrical.363 |
| VCA ext. CV | cv | — | External CV input to control the output VCA, bypassing the internal squelch. Normalled to squelch control signal. From about +8V the VCA is fully open.363 |
| Outputs (3) | |||
| Audio Out | audio | — | Audio output of the frequency shifter; output of the up/down mixing unit.363 |
| Cos (output) | audio | -6V to 6V | Cosine output of the internal quadrature VCO, approximately 12Vpp (+6V/-6V).363 |
| Sin (output) | audio | -6V to 6V | Sine output of the internal quadrature VCO, approximately 12Vpp (+6V/-6V).363 |
Parameters 7
| Name | Type | Range | Behavior |
|---|---|---|---|
| FCV | knob | — | Attenuator for the FCV In jack; controls the amount of external CV applied to the shifting frequency.363 |
| Frequ. 1 | knob | 20Hz – 5000Hz | First manual control of the shifting frequency. Factory default is coarse setting (about 20Hz–5kHz). Can be swapped to fine via internal jumper JP15.363 |
| Frequ. 2 | knob | — | Second manual control of the shifting frequency. Factory default is fine setting. The coarse-to-fine ratio is about 25:1 (approx. 8 octaves to 1/3 octave). Can be swapped to coarse via internal jumper JP16.363 |
| Level | knob | — | Attenuator for the audio input. Adjust so overload LED just begins to light; full LED = clipping/distortion, permanently off = level too low (degrades SNR). Typical input level 1Vpp.363 |
| Mix | knob | — | Controls the ratio of up-shift to down-shift signal at the audio output. Fully CCW = down shift only; fully CW = up shift only; in between = blend of both.363 |
| Mix CV | knob | — | Attenuator for the Mix CV In jack; controls the amount of external CV applied to the up/down mixing ratio.363 |
| Squelch | knob | — | Controls squelch function. Fully CCW: output VCA follows the envelope derived from the audio input (mutes when no signal). Fully CW: VCA permanently open, squelch disabled. In between: continuously adjustable squelch intensity.363 |
Firmware history 0 versions
No firmware history recorded.
References 2
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[363]
Doepfer A-126-2 Voltage Controlled Frequency Shifter II Manualmanual● verified 2026-05-15
- [364]