The big website for the Doepfer A-100 analog modular system

This website is the continuation of “The big book on the Doepfer A-100 analog modular system” that I published in 2011 (German only).
Here you will find a few pages on the basics of the modular system (9 chapters under the menu item “Basic knowledge“) and then there will be a separate page for each module. The modules will be created piece by piece and continuously expanded. At the moment the German section contains about 150 modules (these are almost all from the book and some new ones), another 50 are still in preparation, more than 80 already translated into English. Since these 50 are mostly newer modules that have not yet been described in the book, progress is now a little slower…
You can find the latest posts here, a list of all the modules described by category here.
In the meantime, the contents of the original book (German) as a PDF download:
Das Große Buch zum Doepfer A-100 Analog Modular Synthesizer
Have fun!
Andreas Krebs


New post on the A-130-8 Octal Linear VCA (10/29/2023)
New post on the A-111-5 Mini Synthesizer (10/22/2023)
New post on the A-121s Stereo Multimode VCF (09/25/2023)
New post on the A-111-3 Micro VCO / VCLFO (08/25/2023)
New post on the A-171-4 Quad VC Slew Limiter (07/25/2023)
Update on the polyphony chapter (06/23/2023)
New posts on the (unfortunately no longer produced) Vocoder moudles A-129 / 1+2, A-129 / 3, A-129 / 4 and A-129 / 5 - with sound examples for each (06/21/2023)
Being busy with translating the original German content we now have 70 module descriptions in English ... more will come soon. (04/22/2023)
Website update: New and hopefully more comfortable layout than before. (03/07/2023)
The post on the A-111-4 had a defective audio file for the hard sync vs. soft sync - sound sample. The bug is fixed. (02/23/2023)
New chapter: Polyphony in the A-100 (12/26/2022)

Recent posts:

  • A-131 Exponential Voltage Controlled Amplifier
    The A-131 module is the “sibling module” of the A-130 VCA. In contrast to this, it works with an exponential characteristic, but is otherwise identical. This makes it rather unsuitable for amplifying control voltages, but in most cases it is … Read more
  • A-121-2 12 dB Multimode Filter
    Like its predecessor A-121, the A-121-2 filter is a multimode filter with 12dB slope that offers separate outputs for highpass, lowpass, bandpass and notch (bandstop). Technically, the filter is a direct offshoot of the “Dark Energy II” synthesizer, which basically … Read more
  • A-120 24dB Low Pass Filter
    The A-120 module is – the name “Low Pass 1” suggests it – something like the “mother of all Doepfer filters” (from a historical perspective, not from a technical perspective). The circuit is based on the famous 24 dB Moog … Read more
  • A-119 External Input / Envelope Follower
    The idea of running an audio signal such as vocals or drums through a modular system is always popular – with hopefully musically usable output. In addition to the often heard filtered drums, you can of course do a lot … Read more
  • A-130-8 Octal Linear VCA
    It’s hard to imagine even more VCAs in a small space than the A-130-8 allows. No fewer than eight independent, linear VCAs are housed here in just 6HP. And because there was still some space on the front panel, there … Read more

All photos and module drawings (unless they come from the author himself) with the kind permission of Doepfer Musikelektronik GmbH, Gräfelfing.