Doepfer A-126-2 Frequency Shifter V2

€359.00 *
Net price: €301.68

Prices incl. VAT plus shipping costs

Color

  • 210446
  • 41
This is the Board A Version 2 revision featuring an Audio In pin for the expander module.... more
Product information "Doepfer A-126-2 Frequency Shifter V2"

Analog frequency shifter with Quadrature VCO and envelope follower for squelch function.

This is the Board A Version 2 revision featuring an Audio In pin for the expander module. Doepfer's new frequency shifter is a complex, fully analog effect generator for audio signals. The module consists of a considerable amount of sub-functions like Quadrature VCO, ring modulators, filters, envelope follower, VCA and crossfader, which add up to a sophisticated frequency shifter. The special features of the A-126-2 are functions like the squelch parameter, that can follow the level of the input signal, thus muting the frequency shift effect when the input level is correspondingly low and the crossfader for smoothly blending between upshift and downshift outputs of the frequency shifter. In addition, the sine and cosine outputs of the quadrature oscillator can be tapped individually. 

For DIYers there are pin headers on the back of the module for connecting a DIY breakout module with the following connectors:

  • Envelope follower output
  • Dome filter output 1
  • Dome-Filter Output 2
  • Ring Modulator 1 Output
  • Ring Modulator 2 Output
  • Up Shift Output
  • Down Shift output

 

And for the particularly technically minded, here are a few more details from the Doepfer website:

Technical details:

  • The analog frequency shifter is based on these trigonometric equivalences:
  • sin(a)*sin(b) = cos(a-b) - cos(a+b)
  • cos(a)*cos(b) = cos(a-b) + cos(a+b)
  • Building the sum and difference of these formulas one obtains:
  • Sum: sin(a)*sin(b) + cos(a)*cos(b) = 2 cos(a-b)
  • Difference: sin(a)*sin(b) - cos(a)*cos(b) = -2 cos(a+b)
  • When (a) in these formulas is treated as an audio signal and (b) as a sine signal it's possible to derive an up or down frequency shift with the frequency amount (b) for the audio signal (a). To realize the formulas these electronic circuits are required:
  • A phase shifter that shifts all frequencies of the audio signal (a) by 90 degrees (sine and cosine are the same signals but with 90 degrees phase difference). Such a circuit can be realized by means of a so-called Dome filter (named after the inventor Robert Dome). The circuit is made in principle with several allpass filters which have to be dimensioned very carefully so that the phase shift for all relevant frequencies is as close as possible to 90 degrees. In the A-126-2 a 12-stage Dome filter is used which is made with close-tolerance parts (resistors with 0.1% tolerance and capacitors with 1% tolerance). That way the time killing adjustment of many trimming potentiometers (with mutual influence) is avoided.
  • The Dome filter of the A-126-2 generates 90 degrees phase shift with less than 0.3 degrees error over a frequency range of about 50 Hz to 14 kHz.
  • A quadrature oscillator (i.e. an oscillator with simultaneous sine and cosine output, similar to the already existing modules A-143-9 or A-110-4  
  • two multipliers: in the A-126-2 two ring modulators are used for this job
  • a summing unit
  • a subtracting unit

Beyond that the A-126-2 has some special features:

  • An envelope follower is used to derive an envelope signal from the audio signal. It generates a voltage that corresponds to the current level of the audio signal. A comparator is used to drive an LED which works as overload display. In addition the envelope signal is used to control a VCA which works as a squelch unit.
  • The up and down outputs are internally connected to the inputs of a voltage controlled crossfader. That way the relation between up and down signal can be controlled manually and by means of an external control voltage.
  • The module is fully DC coupled so that even very low frequency shifts are possible (with external quadrature VCO)

HE: 3
TE: 8
Depth: 41
Power consumption +12V: 80
Power consumption -12V: 70
Related links to "Doepfer A-126-2 Frequency Shifter V2"
"Doepfer A-126-2 Frequency Shifter V2"
A-126-2 @Doepfer
Here is the information available on the brand...... more
Doepfer Musikelektronik GmbH

WIth a long trajectory building synths, MIDI keyboards and designing bespoke devices for music pioneers Kraftwerk, Dieter Doepfer decided to design his own modular synthesizer in 1995 based on existing electrical and mechanical specifications of lab equipment he used during his years at university. The official presentation of the system at 1996 Frankfurt Musikmesse caught everyone by surprise and created lots of interest. After Doepfer published the specifications on his website, many instrument designers and engineers saw the potential of the new Eurorack format. Doepfer continues expanding their catalog of over 200 modules (and counting), operating from their modest offices in the outskirts of Munich.

210614_1 Doepfer A-126-2exp Expander
From €49.00 *
Net price: €41.18
150036_1 Doepfer A-110-4 Quadrature ThruZero VCO
€139.00 *
Net price: €116.81
190493_1 Tiptop Audio - Stackcable 40cm (cyan)
€7.80 *
Net price: €6.55
190012_1 2hp - Mix
€110.00 *
Net price: €92.44
230234_1 Joranalogue - Pivot 2
€159.00 *
Net price: €133.61
230166_1 Blukač - Endless Processor
€328.00 *
Net price: €275.63
220601_1 Expert Sleepers - Pandora
€188.00 *
Net price: €157.98
220497_1 Koma Elektronik - Solenoid
€15.00 *
Net price: €12.61
220414_1 WMD - Legion
€549.00 *
Net price: €461.34
220413_1 WMD - Subway
€298.00 *
Net price: €250.42
220415_1 WMD - Orion
€268.00 *
Net price: €225.21
220248_1 AJH Synth - Multi Burst Envelopes
From €289.00 *
Net price: €242.86
210521_1 XAOC Devices - Erfurt
€159.00 *
Net price: €133.61
190154_1 Qu-Bit Electronix - Chord V2
€338.00 *
Net price: €284.03
220120_1 Audio Gear Obsession - Dynamic Engine
€1,098.00 *
Net price: €922.69
220073_1 Intellijel Designs - USB Extender 1U + 3U
€44.00 *
Net price: €36.97
210314_1 Endorphin.es - Total Recall
€199.00 *
Net price: €167.23
190315_1 Endorphin.es - Squawk Dirty To Me
From €199.00 *
Net price: €167.23
210548_1 Joranalogue - Enhance 2
€189.00 *
Net price: €158.82
210547_1 Joranalogue - Orbit 3
€248.00 *
Net price: €208.40
210573_1 Instruo - [1]f
€108.00 *
Net price: €90.76
210545_1 Neuzeit Instruments - Quasar
€488.00 *
Net price: €410.08
210537_1 Tubbutec / LPZW - 6m0d6
€689.00 *
Net price: €578.99
210382_1 Miso Modular - Cornflakes
€498.00 *
Net price: €418.49
210241_1 ALM Busy Circuits - Axon-1
€128.00 *
Net price: €107.56
180089_1 Noise Engineering - Clep Diaz
€199.00 *
Net price: €167.23
200340_1 Mutable Instruments - Beads
€282.00 *
Net price: €236.97
200381_1 Norand - Mono
€638.00 * €838.00 *
Net price: €536.13
200355_1 Erica Synths - Black Sequencer
€534.00 *
Net price: €448.74
200308_1 Klavis - Twin Waves MKII
€249.00 *
Net price: €209.24
200099_1 Divkid - Rnd Step
€238.00 *
Net price: €200.00
160214_1 Doepfer A-111-2 High-End VCO 2
€249.00 *
Net price: €209.24
190741_1 IO-Instruments - Euporie
€129.00 *
Net price: €108.40
200007_1 Qu-Bit Electronix - Aurora
€418.00 *
Net price: €351.26
190624_1 Tendrils - Patch Cables 15 cm (6 Pack)
€14.00 *
Net price: €11.76
190627_1 Tendrils - Patch Cables 45 cm (6 Pack)
€14.00 *
Net price: €11.76
190628_1 Tendrils - Patch Cables 60 cm (6 Pack)
€15.00 *
Net price: €12.61
190629_1 Tendrils - Patch Cables 90 cm (6 Pack)
€15.00 *
Net price: €12.61
220284_1 XAOC Devices - Koszalin
€329.00 *
Net price: €276.47
210614_1 Doepfer A-126-2exp Expander
From €49.00 *
Net price: €41.18
230675_1 Schlappi Engineering - Nibbler
€269.00 *
Net price: €226.05
HOT SHIT
230272_1 Critter & Guitari - 5 Moons
€348.00 *
Net price: €292.44
200196_1 WMD - C4RBN
€268.00 *
Net price: €225.21
160214_1 Doepfer A-111-2 High-End VCO 2
€249.00 *
Net price: €209.24
160236_1 ALM Busy Circuits Akemie's Taiko
€358.00 *
Net price: €300.84
230608_1 Fancy Synthesis - Rung Divisions
€348.00 *
Net price: €292.44
230651_1 Forge TME - VHIKK X Drone Voice
€528.00 *
Net price: €443.70
230540_1 Doepfer A-147-5 Quad VCLFO
From €105.00 *
Net price: €88.24
230633_1 Bastl Instruments - Ciao!!
€249.00 *
Net price: €209.24
230205_1 ALM Busy Circuits - TAZM-O
€378.00 *
Net price: €317.65
120242_1 Analogue Systems RS-240 Bode Freq Shifter
€1,250.00 *
Net price: €1,050.42
190272_1 Doepfer A-121-3 Multimode VCF Slim Line
€98.00 *
Net price: €82.35
180540_1 Koma Elektronik - Field Kit FX Standalone
€349.00 *
Net price: €293.28
150036_1 Doepfer A-110-4 Quadrature ThruZero VCO
€139.00 *
Net price: €116.81
180224_1 Befaco - Output V3
€144.00 *
Net price: €121.01
230583_1 Dnipro Modular - Ewa
€148.00 *
Net price: €124.37
HOT SHIT
230673_1 Lorre Mill - Comb Room
€399.00 *
Net price: €335.29
230568_1 Squarp - Hermod+
€545.00 *
Net price: €457.98
220581_1 ALM Busy Circuits - Pamela's PRO Workout
€318.00 *
Net price: €267.23
220408_1 XAOC Devices - Sofia
€489.00 *
Net price: €410.92
210435_1 Olivella Modular - Signos
€238.00 *
Net price: €200.00
160288_1 Mordax - Data
€485.00 *
Net price: €407.56
160294_1 Doepfer A-110-6 Trapezoid Thru Zero VCO
€259.00 *
Net price: €217.65
190093_1 Buchla - 261e Complex Waveform Generator
€1,998.00 *
Net price: €1,678.99
190092_1 Buchla - 259e Twisted Waveform Generator
€1,898.00 *
Net price: €1,594.96
120871_1 Make Noise - Optomix (Rev.2)
€225.00 *
Net price: €189.08
150289_1 Make Noise - Skiff (with power)
€299.00 *
Net price: €251.26
190276_1 Doepfer A-145-4 Quad LFO Slim Line
From €82.00 *
Net price: €68.91
120122_1 Doepfer A-138d Crossfader / FX insert
€75.00 *
Net price: €63.03
170029_1 WMD - MSCL
€308.00 *
Net price: €258.82
160201_1 AJH Synth - Ring SM
€359.00 *
Net price: €301.68
230709_1 Cosmotronic - Messor
€235.00 *
Net price: €197.48
HOT SHIT
240040_1 Make Noise - modDemix
€158.00 *
Net price: €132.77
240037_1 Make Noise - Maths 2
€329.00 *
Net price: €276.47
230730_1 APB - ProSpec 1U4M4S
€1,269.00 *
Net price: €1,066.39
Viewed