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The '''Resistive [[opto-isolator]]''', '''photoresistive opto-isolator''' or '''vactrol''' in its simplest form, the analog optoisolator consists of
An early manufacturer of these devices was Vactec Inc, who used the trademark ''Vactrol'', and this has since largely become genericized to cover all such available devices, whoever might make them. Through acquisitions etc., Vactec became part of Perkin Elmer, and recently it appears the Vactrol trademark has passed to a company called 'Excelitas'.
There are reports of success using the Fairchild H11FxM family. These devices use a silicon photo-detector (rather than an LDR), which behaves like
==Manufacturers==
*Excelitas, [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, [http://macron.com.hk/specification.htm Macron specification page]
*The Silonex 'NSL' series, [http://www.silonex.com/audiohm/index.html Silonex Audiohm Optocouplers]
*Fairchild H11FxM, [http://www.fairchildsemi.com/tree/optoelectronics/solid-state-relay-optocouplers/solid-state-relay/ Solid State Relay Optocoupler]
==References==▼
==See also==
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*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: [http://www.excelitas.com/Pages/Product/Analog-Optoisolators-and-Optocouplers.aspx Analog Optoisolators and Optocouplers]
▲==References==
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