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[[File:Sequential Circuits Prophet-5 Rev 3.3.jpg|thumb|right|400px|Sequential Circuits Prophet-5 Rev 3.3]]The '''Sequential Circuits Prophet-5''' released in 1978, was the first completely programmable [[polyphony|polyphonic]] [[analog]] synthesizer. [[Dave Smith]] designed the electronics and coded the firmware.<ref name="oman">''[http://www.synthfool.com/docs/SequentialCircuits/Prophet_Series/Sequential%20Circuits%20Prophet%205%20Owners%20Manual.pdf Prophet-5 Synthesizer Operation Manual]'' by Stanley Jungleib, Synthfool.com</ref><ref name="vail">''Vintage Synthesizers'' by Mark Vail, Miller Freeman, 1993, {{ISBN
== Features ==
The Prophet-5 is five voice [[subtractive synthesizer]]. Each voice is an individual synthesizer with two [[VCO]]s (voltage controlled oscillators) osc A and osc B, a [[mixer]], a 24dB per octave four pole resonant low-pass [[VCF]] (voltage controlled filter) controlled by an ADSR [[envelope generator|EG]] (envelope generator) and a final [[VCA]] (voltage controlled amplifier) controlled by another ADSR EG. It also has a single [[LFO]] (low frequency oscillator) and pink noise source.<ref name="techman">''[http://www.synthfool.com/docs/SequentialCircuits/Prophet_Series/Sequential%20Circuits%20Prophet%205%20Technical%20Manual.pdf Sequential Circuits Prophet 5 Technical Manual]'' by Stanley Jungleib, Synthfool.com, s. 2.2</ref><ref name="mbll">[
Both oscillators can generate [[sawtooth]] wave and [[square]] waves (with variable pulse width). Osc B can also generate a [[triangle wave|triangle]] wave and be detuned over a [[semitone]]. The oscillators can be played in sync, or in poly-mod (polyphonic modulation), where osc B and the filter EG modulates the frequency or pulse width of osc A, or the filter cutoff frequency.<ref name="oman" /><ref name="vail" /><ref name="ko" /><ref name="mbll" /><ref name="forrest" />
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There were three ''revisions'' of the Prophet-5 between 1978 and 1984:
* Revision 1, , instrument code 1000.1, serial numbers 1-182. The least common. Uses [[Solid State Micro Technology
* Revision 2, instrument code 1000.2, serial numbers 184 to 1299. Uses SSM ICs. Is usually considered to be the better-sounding version of the Prophet-5.<ref name="ko" /><ref name="techman" /><ref name="mbll" /><ref name="forrest" /><ref name="vse" /><ref name="reid" />
* Revision 3, instrument code 1000.3.0 to 1000.3.3, serial numbers from 1300. The most common. Uses [[OnChip Systems|Curtis]] ICs for increased stability and reliability. Is considered by some to have a thinner sound than the previous revisions. These start at serial number 1300.<ref name="vail" /><ref name="ko" /><ref name="techman" /><ref name="mbll" /><ref name="forrest" /><ref name="vse" />
== Significant electronics ==
[[File:Prophet 5 analog section block diagram.png|thumb|center|500px|A simplified block diagram of the Prophet 5's analog section.]]
The Prophet's eleven oscillators – two per voice and one LFO, are based on the [[CEM3340]] VCO IC, (before Rev 3 the [[SSM2030]]). The IC is scaled at 1V/octave. This means that an overall CV change of 1V ideally produces a pitch change of exactly one octave. So, a CV change of 1/12V (83.3 mV) changes pitch by one semitone.<ref name="techman" /><ref name="mbll" />
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The voltage controlled amplifiers are based on the [[CA3280]] transconductance op-amp IC (before Rev 3 the [[SSM2020]]).<ref name="techman" />
A [https://en.wikipedia.org/wiki/Zilog_Z80 Z80] [[CPU]] keeps the VCOs in tune, generates most [[CV/
== Modifications ==
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* [https://www.davesmithinstruments.com/ Dave Smith Instruments]
* [http://www.siliconbreakdown.com/prophet5.html Sequential Circuits Prophet 5 Synthesizer], photos
* [https://web.archive.org/web/20161008052906/http://users.telenet.be/prophet-5/main.htm Sequential Circuits Prophet 5 Tribute Site]
* ''[http://www.synthmuseum.com/magazine/0011bc.html Sequential Circuits Prophet-5]'' by Brad Coates (www.melmusic.com.au)
* Scroll down for [http://www.synthmuseum.com/sequ/seqpro501.html Comparing the Rev2 to the Rev3] by David Bellamy
* ''[http://greatsynthesizers.com/en/test/sequential-circuits-prophet-5-milestone-and-musical-legend/ Sequential Circuits Prophet-5 – Milestone and Musical Legend]'' by Theo Bloderer 2 July 2016
* ''[https://youtu.be/Ruh0B5QKBMs The History of the Prophet Synthesizer]'' by Alex Ball, YouTube, Oct 2018
* ''[https://imgur.com/a/SDcaqU3 The guts and glory of a Sequential Circuits Prophet-5 Rev 2]'' by Synthead
=== Other wikis ===
* [https://en.wikipedia.org/wiki/Sequential_Circuits_Prophet-5 Sequential Circuits Prophet-5], Wikipedia
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* [https://archive.org/details/synthmanuals-sequential Archive.org], Rev 3.3 owners & rev. 3.0/3.1/3.2 technical manual
=== Mods ===
* [
* Kenton [http://www.kentonuk.com/ MIDI Retrofit Kit]s for Prophet 5 Rev 2 and 3.x
* [http://electricdruid.net/wp-content/uploads/2015/07/NoiseGen1Datasheet.pdf Electric Druid Noise Generator], replacement noise generator for Sequential Circuits Prophet-5
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