This is a replica of the ARP 2600 Voltage Controlled Amplifier, which is a transistor VCA. This Euro Rack module makes use of matched transistor arrays and a high quality buffer Op Amp at the output stage. The 4019 VCA is very similar to the 2500 VCA, which was the first 4010 VCA module in […]
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The 12HP wide AM1008 is a completely new module that marries a VCA and ADSR envelope generator in the style of ARP 2500 dual modules (e.g. Filt Amp, Mod Amp). The design makes use of 1980’s synth chips to create a simple but elegant design that works well with the AMSynths range of 2500 style […]
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A 14HP Eurorack replica of the ARP 1042 module which has three voltage controlled amplifiers. The original was announced by Tonus/ARP back in 1970 but unfortunately never made it into production or a prototype stage. It would have provided a set of VCA’s to be used for CV and signal control with having to tie […]
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In August 2020 I bought a set of Behringer System 55 modules, as my first journey into Moog modular. The plan was to recreate the Klaus Schulze Moog IIIp synthesizer and Dual Sequencer setup that Klaus bought on 22nd December 1975, and used successfully for many years. I thought it would be useful to explain […]
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The 12HP wide AM1005 is a re-imaging of the four quadrant multiplier and VCA that ARP launched as the 1005 module in 1970, and was included in the 2500 synthesizer. The electronic design is close to the original, with CV inputs and level potentiometers for the VCA, and audio inputs going straight into the four […]
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When Roland developed the System 100M they created a rather nice Dual VCA module (130). This is a fantastic module but the signal path is AC coupled, which means the VCA cannot be used for adjusting the level of CV signals. Although Roland added more modules over time, including a DC Mixer, they never produced […]
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This is a 5U replica of the unusual ARP 1005 module from the ARP 2500 analog modular synthesizer, which was designed in collaboration with Hybrid Systems Corp, a semiconductor company in the Boston USA area, close to the Tonus/ARP head office. The module consists of a discrete transistor based Ring Modulator, whose output is then […]
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This 16HP Eurorack module re-imagines the Roland 100M module of 1978. It combines the 24dB OTA filter from the Jupiter 8 with the VCA from the 130, which has linear and exponential modes. The filter has Q compensation, 12 and 24dB modes and a resonance that goes to the edge of self-oscillation. Overview The AM8120 […]
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Overview In 2022 I developed a set of Eurorack modules to replicate the Roland SH-101, which was originally launched in 1982. The AM8112 module is an accurate replica of the ADSR and VCA circuits in the SH-101, made possible by the release of the AS662 chip by Alfa Rpar. It is very similar to the […]
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A 10HP wide module that replicates the VCA and envelope generator from the Roland SH-2 monosynth. Overview In 2022 I developed a set of Eurorack modules to replicate the Roland SH-2, which was originally launched in 1979. A fantastic sounding two VCO analog monster. The AM8103 module is an accurate replica of the ADSR and […]
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