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in my project i am using a laser diode of 2.6v dc and max operating current of 45mA to transmit audio signal. what is the cost for this laser? country-INDIA state-KERALA
http://www.bing.com/search?q=2.6V+45mA+laser+diode&src=IE-Address
Eventually, you will need to learn how to source your own parts. That's part of the learning experience.
Until you do this, you will be at the mercy of someone else to gather your knowledge for you. This will make it difficult to succeed in life.
Do your own homework.