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How to connect an active mixer to a mobile phone.

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Riaandk

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I build a small mixer circuit from, Electronic Projects for Video Enthusiasts, and i want to plug its output into a Nokia 1200 mobile phone. If I connect the mixer output to a bench amp it works very well, but if i connect it to the headset mic, it is very soft. Any ideas, please.
 

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The opamp has a voltage gain of 68k/47k= 1.45 times which is not much gain. Its output is capacitor-coupled to an attenuator made with a 10k resistor feeding a 1k resistor so its output is 1/11th the level at the output labelled "To Amp". Try connecting the output labelled "To Amp" to the mic input of your phone.
 
Thanx Audioguru, I followed your advice and it worked.
Regards
Riaan
 

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