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[[File:Radio-Electronics May 1973 cover.jpg|thumb|right|300px|The Radio-Electronics May 1973 cover, featuring a PAiA 2720 with button keyboard.]]The '''PAiA 2720 modular synthesizer''', 'a playable but limited instrument', was designed in 1972. The construction was published in [[Radio-Electronics magazine]], May to Oct 1973. While a [[Moog]] system at the time cost from $5,000 to $10,000, the
[[PAiA 4700]] and 2700 modules are mutually compatible.<ref>[https://www.muzines.co.uk/images_mag/pdf/pl/pl_76_02.pdf Editorial], Polyphony 1/76</ref>
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* [https://mou.sr/3DZpyYa 171-PA3191-1-E], 3.5 mm phone connector
* [https://mou.sr/3FJm3q5 530-105-0302-1], Red tip plug
* [https://mou.sr/3E125WT 602-1635-100-03], Red EPR
=== Voltage controlled amplifier ===
The [[Paia 2720-1 voltage controlled amplifier|2720-1 voltage controlled amplifier]] is an op-amp driven by a differential pair.<ref name="sep">[https://worldradiohistory.com/Archive-Radio-Electronics/70s/1973/Radio-Electronics-1973-09.pdf Radio-Electronics, Sep 1973, pp. 53-55]</ref><ref name="cat">[https://archive.org/details/synthmanual_PAIA_catalogue_1978/page/n15/mode/2up PAiA catalogue 1978], pp. 8-9</ref>
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* [https://modwiggler.com/forum/viewtopic.php?t=47298 weird modular lust (early paia!?!?)], Mod Wiggler Forum, Nov 2011
* [https://modwiggler.com/forum/viewtopic.php?t=143551 Paia 2700/4700 power supply and other questions], Mod Wiggler Forum, Aug 2015
* [http://www.armory.com/~rstevew/Public/SoundSynth/2720A_PAiA_Synth/
* [https://www.synthforbreakfast.nl/radio-electronics-1973-paia-2700-diy-synth/ Radio Electronics 1973 – Paia 2700 DIY synth], synthforbreakfast.nl
=== YouTube ===
* [https://youtu.be/IFovqwe4neA 1974 Paia Synthesizers demo record]
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