PatchPierre

Old version of the A-135 The original A-135 module was a simple quad voltage controlled mixer. It was made of 4 independent linear VCA...

Yay... finally a new filter-module :-) Last week i treated myself with an A-106-5 SEM Filter . The A-106-5 is a 12dB multimode filter th...

Another good way to mess up your audio ( and CV signals ) is with the A-116 VC Waveform Processor module. After the input amplifier, the ...

I might have underrated the A-137-1 Voltage Controlled Wave Multiplier a bit. Until lately... The basic idea of a wave multiplier is to m...

Another A-100 module that was discontinued a few years ago is the  A-197 Analog Meter . This simple module could be used to display DC or...

Good value-for-money and serious rackspace-savers are Doepfer's Quad modules. These modules offer four (-duh-) identical but individual...

Module A-122 (VCF 3) is a voltage-controlled low-pass filter, which's circuitry uses a Curtis Electromusic chip (CEM3320), and sounds v...

Module A-132-1 Dual Low Cost VCA contains two simple voltage controlled amplifiers, each with a linear response. They are most suitable for...

A Voltage Controlled Amplifier ( VCA or variable-gain amplifier) is an electronic amplifier that varies its gain depending on an incoming co...

Module A-138 is a simple four channel mixer that can be used for either control voltages or audio signals. (although i hardly ever use one ...

Module A-146 (LFO 2) is a Low Frequency Oscillator, which produces periodic control voltages over a wide range of frequencies. The LFO can ...

Perhaps i should have started my whole PatchPierre blog with writing about the most basic and essential A-100 modules first. How the four...

Perhaps the best known low-pass filter in analogue synthesis was developed by Dr Robert (Bob) Moog in the late sixties. It was used in the...

" A Logic Gate is an idealized or physical device implementing a Boolean function. It performs a logical operation on one or more log...

The A-103 18 dB Low Pass filter (VCF6) is Doepfer's own 'TB-303 filter clone' ; It uses a so-called transistor ladder with a...

The A-162 Dual Trigger Delay contains two separate delay circuits for trigger signals. This module makes it possible to delay the onset of...

The A-175 (Dual) Voltage Inverter simply does what the name says;  it contains 2  separate  inverters that invert the voltage of incoming s...

The A-124 is a special 12dB multimode filter using the filter circuit of the EDP Wasp , a monophonic black and yellow analog synthesizer...

Low Frequency Oscillators  or LFO's produce periodic control voltages that can be used as a modulation source for all kinds of other mod...

I mentioned my A-170 Dual Slew Limiter earlier in a few BFF posts, but so far i never took the time to write a separate blogpost about it. ...