Elaine Radique is the most famous musician to have worked with the ARP 2500, and she has spent over 25 years making music with this remarkable instrument. Her music is well worth listening to, and a video example is attached below. ARP 2515 Elaine’s ARP 2500 is a model 2515 with 15 module spaces in […]
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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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Introduction One of the projects I worked with Behringer on during 2019/20 was the range of ARP 2500 clone modules, and one of the best sounding and most versatile modules is the 1047 Multi Mode filter. I bought a Behringer 1047 module in September 2021 to see how well the filter had turned out and […]
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Introduction During 2019 I worked with Behringer to develop their range of 2500 modules, and one of the most challenging was the 1050 Mix Sequencer. This post describes how it works and how I designed it, ably assisted by the Behringer Manchester team to achieve production status in late 2021. The original ARP design dates […]
Continue ReadingThis post is about how I replicated the ARP 1036 Dual Sample & Hold from the ARP 2500 Modular Synthesizer that was designed in June 1970. This is a pair of sample and hold circuits with clock oscillators and noise sources included. The module is feature rich, having external voltage control of the clocks, trigger […]
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The 1040 Noisillator module from the ARP 2500 synthesizer (also referred to as a VCO/Noise/Random Voltage module) was in the original ARP Tonus announcement of 1970. It can be seen in the initial brochures and in the price list at $595. However it was never put into production and we have only a black and […]
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The ARP 1004 VCO is one of the first(THE first?) dual core precision VCO’s ever created. It is cutting edge for 1970 but replicating it is not easy, as the schematics have lots of selected resistors (marked SEL) with no values stated, and the calibration section in the ARP service manual is rather brief on […]
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The ARP 2500 used a variety of potted sub modules to provide stable exponential generators and current mirrors. They typically contain matched transistor pairs and wire wound Tempco resistors. in a potted plastic container. Initially in the 1006 filter I put the 4001 circuit onto the main PCB and used a metal film resistor instead […]
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This is a 5U replica of the 1027 Analog Sequencer from the ARP 2500 Analog Modular Synthesizer, which has 10x step rows and 3x control voltage on vertical columns. The ARP module is double width and has a voltage controlled analog clock which drives the 3x rows of control voltages on the right. The left […]
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The ARP 1050 is the most amazing module in the ARP 2500 synthesizer, a door into a new world of musical creativity. This post describes the technology in the 1050 and how I replicated it back in 2018 as a 5U module. The original was designed back in December 1970 using TTL logic chips and […]
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