It will take me a few days to answer the replies thus far,so I will tackle this one first.
The circuit is an attenuator using in a L pad using 4x NSL32SR3
http://lunainc.com/wp-content/uploads/2016/06/NSL-32SR3.pdf
a pair are the shunt for Left and Right , and a pair are for series Left and Right. Another pair of series are activated for the second input
and a third pair of series, are activated for the third input.
A natural asset of the NSL32SR3 is to exhibit extremely high resistance when in its off state - so forms a contact- less switch.
The stated figure of 20ma in my circuit is never used ( and has never been used ). Total current draw volume full off is 2.78ma
and 4.76ma full on of the LDr circuit measured wiper of the cathode arranged potentiometer to the main board. As the volume is increased
current lessens to a minimum of 0.26ma at mid volume. A discovery of a auto circuit found 2 years ago, begins removing voltage from the
series pairs to give silence at zero volume - a problem that has beset LDR designs from their inception.
The internal led has forward voltage in every circuit I have used them in between 1.3v and 1.8v - making them red or pink
The EU provided me a letter in June of 2014 as follows:
"
Thank you for your message.
The Commission Directive 2012/51/EU has enabled the use of cadmium in photoresistors for analogue optocouplers as an exemption from the ROHS directive. Therefore, indeed, the use of cadmium in photoresistors for analogue optocouplers is currently allowed as there are no other substitutes. We draw your attention in this context to the recitals of the Directive:
http://eur-lex.europa.eu/legal-conte...LEX:32012L0051
This new delegated Directive is based on the Recast of the RoHS Directive which entered into force in January 2013. The information relating to the recast of this Directive with the comments submitted during the public consultation is available on the following website of the Directorate-General for the Environment:
http://ec.europa.eu/environment/wast...e/index_en.htm
If you wish to voice your opinion on waste management issues and changes to the EU legislation, we invite you to consult the public consultations webpage on DG Environment:
http://ec.europa.eu/environment/consultations_en.htm
We hope you find this information useful. Please contact us again if you have other questions.
With kind regards,
EUROPE DIRECT Contact Centre
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