Give Me Some Figures in dB

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Joined: Fri Jun 02, 2017 12:24 am

Give Me Some Figures in dB

Post by aisle » Fri Jun 02, 2017 12:33 am

Good day,all

I am interesting in a audio mixer circuit, which just need simplest one transistor that can support as many audio signal as you can afford. I have built a circuit according to the following diagram after buying one transistor--BC109C and a few resistors and capacitors from site].
6.2.1.gif (3.39 KiB) Viewed 2181 times
Now I would like to incorporate six inputs for this mixer. Suppose I feed signal to one input, and all the other volume controls are at minimum position, there will be a drop in the gain in the active input (which is actually the loading effect of all the volume controls). Can you please give some figures in dB to specify this loading? In virtual earth mixers using opamps, there is practically no loading effect at all.

Can anyone here help me ?Thanks.

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