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[[File:Optoisolator.jpg|thumb|right|100px|Schematic symbol for a phototransistor optocoupler.]]The '''vactrol''', also known as '''resistive opto-isolator''' (RO), or '''photoresistive opto-isolator''' in its simplest form
There are reports of success using the Fairchild H11FxM family.<!-- for what?--> These devices use a silicon photo-detector (rather than an LDR), which behaves like a [[FET]], and so they don't suffer from the lag in response that LDR-based devices have, i.e. they can be modulated at audio rates.<ref name="ts" />
== Manufacturers ==
* Excelitas, [https://web.archive.org/web/20120707054657/http://www.excelitas.com/Pages/Product/Analog-Optoisolators-and-Optocouplers.aspx Analog Optoisolators and Optocouplers]
* Some [[Doepfer Musikelektronik GmbH|Doepfer]] modules are known to use Macron devices, [https://web.archive.org/web/20130731213605/http://macron.com.hk/specification.htm Macron specification page]
* The Silonex 'NSL' series, [https://web.archive.org/web/20120821204302/http://www.silonex.com/audiohm/index.html Silonex Audiohm Optocouplers]
* Fairchild H11FxM, [https://web.archive.org/web/20110607053714/http://www.fairchildsemi.com/tree/optoelectronics/solid-state-relay-optocouplers/solid-state-relay/ Solid State Relay Optocoupler]
== References ==
{{From Mod Wiggler Wiki|Analog Optical Isolators aka Vactrols}}
{{reflist}}
==
* There is also much useful info in the Wikipedia article: [http://en.wikipedia.org/wiki/Vactrol#Resistive_opto-isolators Resistive opto-isolators]
* This Perkin Elmer document contains a good introduction to such devices: [http://denethor.wlu.ca/pc300/optoisolators/analogoptoisolatorintroduction.pdf Analog Optical Isolators: Vactrols]
* A more complete Perkin Elmer 'databook' contains not only the spec sheets of the various types of Vactrols, but also has many useful 'application note'-type circuits of how they might be used: [http://www.datasheetcatalog.org/datasheet/perkinelmer/VT500.pdf Photoconductive Cells and Analog Optoisolators (Vactrols)]
* Current spec sheets are to be found on the Vactrol product page at Excelitas: [https://web.archive.org/web/20120707054657/http://www.excelitas.com/Pages/Product/Analog-Optoisolators-and-Optocouplers.aspx Analog Optoisolators and Optocouplers]
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