help with ear-phones

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There is no earphone load, the earphone output is the signal source.
Click to expand...
I realise that. That's why I referred to it as a signal wire (but I should have said signal input wire). If the OP is still using a 741 and has mistakenly connected the earphone between R1 and the negative rail it might explain his lack of output amplitude.
 
audioguru said:
The title of this thread is wrong.
There is no earphone load, the earphone output is the signal source.
The load is an ADC0808 analog to digital converter with an input resistance of 1k to 3k ohms.
Click to expand...

Look, main target is ADC. It is the load...check
It requires a signal of like 3.5V to detect it (according to datasheet Vin = Vcc - 1.5 )
Now, the resistance of speaker is like 10ohm and of head-phone is 30 ohm... I got amplification upto 7 V somehow and it is fine.
I hope it will work with ADC's input resisitance..
 
I think this is getting more complex than Salman Rushdie's mind or John Terry's scandals.
I'll start a new thread, clarifying my problem
 
This is another classic example of inaccurate and/or incomplete information being given in the original post.
 
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