Skip to main content


Showing posts from January, 2016

Doepfer A-106-5 12dB SEM Filter Special Edition

Temporarily a special edition of the Doepfer A-106-5 12dB SEM Filter is available. It is equipped with a stylish Oberheim-style cream-coloured anodized front panel and black knobs.

Module A-106-5 is a 12dB multimode filter that is based on the filter circuit of the Oberheim SEM
The filter is equipped with a band pass output and a combined low/notch/high pass output.  For this output a control knob defines the relation between low and high pass signal.  If both signals appear at the same level (i.e. middle position of the Mix knob) one obtains a notch filter. Otherwise the low or high pass signal predominates.  The module does not feature self oscillation in contrast to most of the other filters of the A-100 system.  The module generates a distorted audio signal if the level control is set to about 50% (i.e. center position) or more with A-100 standard signals like VCOs.

Inputs: Audio In, CV1 In without attenuator, CV2 In with Polarizer
Outputs: Bandpass Out, Low/Highpass Mix-…

Doepfer A-184-1 Ring Modulator / S&H/T&H / Slew Limiter Combo

Another unexpected release from Doepfer

A-184-1 is the combination of 3 functions which are actually already available in other modules (e.g. A-114, A-148, A-170). In many systems it's not necessary to have two ring modulators (A-114) or two S&H units (A-148) or two slew limiters (A-170) available. That's why we have compiled these function in one small 4 HP module.
The upper section is nothing but half of an A-114, i.e. a ring modulator with the usual X/Y inputs and the X*Y output.

The lower section is a Sample & Hold (S&H) / Track & Hold (T&H) unit followed by a slew limiter.
An internal jumper is used to set the mode to S&H or T&H. In S&H mode the unit picks out a sample from the voltage at the SH input at the rising edge of the trigger signal input. In T&H mode the output follows the input voltage as long as the level of the trigger signal is high.
As soon as the trigger signal turns low, the last voltage is stored.
The trigger input is …

Downloadable Frontplate Templates for Doepfer Modules Announced

You might have noticed the colorful new frontplates on the Doepfer website recently.
I had almost mistaken them for new Special Editions, but Doepfer clearly writes:

"The custom versions of a few modules featured on the Doepfer website are only a design study made with a self adhesive foil, printed by a color laser printer.

That way the customer will be able to design "his" personal module by printing his design on an self adhesive foil and stick the foil to the module (for this the module has to be dismantled).There are no plans to offer these versions of the module, but they do plan to offer suitable templates for download."

Knobs in different colors are also still available so your only limit will be your imagination.
I wonder how Doepfer will further develop this idea... i.e. if there could be such a thing as an online Doepfer Template designer tool or such... Hmmm... Nice.

The first examples look very impressive IMO...

Doepfer A-110-6 Trapezoid Thru Zero Quadrature VCO Announced

The Doepfer A-110-6 Trapezoid Thru-Zero VCO is the third of Doepfer's Thru-Zero oscillator-range. The module is based on an idea by Donald Tillman from 2003 but has been revised for the use of modern electronic circuits (no OTAs/CA3280).  Because of it's unique trapezoid core it's totally different compared to other VCOs but the trapezoid core is not the only specialty: it is also a quadrature VCO and features linear thru zero frequency modulation.
The term "quadrature" means in this connection that the oscillator outputs two trapezoid waves with 90 degrees phase shift. The same as sine and cosine of a standard quadrature oscillator. These waveforms are called TRASIN (trapezoid sine) and TRACOS (trapezoid cosine).
The term "Thru-Zero" means that even "negative" frequencies are generated. But this a bit a misleading term as negative frequencies do not really exist. "Negative" means in this connection simply that the TRASIN/TRACOS wav…

Doepfer A-110-3 Triangle Thru Zero VCO Specifications

The Doepfer A-110-3 Triangle Thru Zero VCO is the second Thru-Zero module that Doepfer is releasing ( after the A-110-4 Quadrature Thru-Zero VCO )
This module was first shown in November 2014 ( read HERE ), and now there's an official release right before NAMM2016.

The A-110-3 is a Thru Zero VCO with triangle core. The term "Thru-Zero" means that even "negative" frequencies are generated. But this a bit a misleading term as negative frequencies do not really exist. "Negative" means in this connection simply that the triangle wave will stop when the linear control voltage reaches 0V and continue with the opposite direction as the linear control voltage becomes negative and vice versa.

The module has two control sections: linear and a exponential. The exponential section consists of the XTune control, the 1V/Oct input and the XFM input with the corresponding attenuator XFM. The exponential control voltage is the sum of these three voltages.  The linear …

Doepfer A-121 Multimode Filter Re-Design

We all knew a re-design of the Doepfer A-121 Multimode Filter has been in the pipeline for a while, due to the unavailability of certain chips inside.

Since the beginning this has always been one of my favourite filters, because of it's sophisticated sound and the VC infut for resonance control. Oh, and the multiple simultanuous outputs...

At Namm 2016 Doepfer will present the A-121-2, the successor of the obsolete module A-121.
The circuitry is totally different from the A-121 which used the obsolete CEM3320 filter circuit. 
Module A-121 is a voltage-controlled multi-mode filter with a cut-off slope of -12 dB / octave.
Four simultaneous outputs are available, each with different characteristics: low-pass, band-pass, high-pass and notch (or band reject).  The cut-off frequency determines the point at which the respective filter effects appear.  The frequency can be adjusted manually, or by voltage control (Filter modulation, for instance by an LFO or ADSR).  Two CV inputs are ava…

Doepfer in Black... Vintage Style

Exciting news from Doepfer for this upcoming NAMM2016.

First this:
Finally they decided to release modules featuring black frontpanels with white print and vintage style knobs.
The result is truly stunning... i would love to change all my silver frontpanels rightaway :)
It will also look great with their latest series of Special Edition modules.

Imagine this with their new colored knobs too... i'm very excited for this :)

So far for these modules vintage versions are planned:
A-110-1 Standard VCO, ƒA-110-2 Basic VCO, A-114 Ring Modulator, ƒA-118 Noise/Random, A-120 24dB Transistor Ladder Lowpass Filter, A-132-3 Dual Linear/Exponential VCA, A-138 Mixer, A-140 ADSR, A-147-2 VCDLFO, A-148 S&H/T&H, A-180-2 2x4 Multiple and the A-190-3 USB/MIDI-to-CV/Gate Interface.
If there are sufficient inquiries they will offer the black panels and vintage style knobs as spare parts.
There are also plans to offer more modules with black panels (e.g. the sequencer series A-154/A-155/A-156).