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Old 23rd September 2006, 02:59 PM   #1
Leolabs is offline Leolabs  Malaysia
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Question FET optocoupler as VR

I already read the thread about the Silonex's Audiohm optocoupler "Lightspeed Attenuator",wondering how about Fairchilds's H11F1???Although the Ron is higher,about 200 ohms.
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Old 24th September 2006, 05:38 AM   #2
EUVL is offline EUVL  Europe
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You get poor linearity for any input signal more than +/- 0.02V (see Figure 2 Output Characteristics of Datasheet).

Patrick
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Old 24th September 2006, 07:48 AM   #3
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Poor linearity is another way of saying distortion
Thanks for the heads up on the lightspeed attenuator thread
Those devices are sometimes known as vactrols and used by record producers to get the sound they like using compression, an ugly word for hi-fi enthusiasts. In fact the compressor is also called a joemeek after the legendary record producer who first used the technique.
Until I discovered the Silonex parts (perkin-elmer stuff is difficult to get in the UK) I made my own devices using a yellow Led (to match the wavelength of the LDR) a LDR and some 5mm heatshrink sleeve.
In the Lightspeed attenuator the device is simply used as a volume control there is no compression.
Another way of doing it is here:
http://www.maxim-ic.com/appnotes.cfm...te_number/1118
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