This circuit is a simple mixer circuit. It can mix two signal channels and one channel is output. Using a codec circuit,Convert stereo audio to mono audio time.
-In circuit a FET number 2N3819 is main, it is better than a common transistors that a high impedane input and high gain too. so cause low noise and.. It can increase the number of channels too, By adding a VR1, R1 and C1 to the amount needed. Then connected to Buffett a new one. Most importantly is eating circuit current is very low.Can use with 9-volt batteries immediately.
When entering voice signal, one of input 1 and input 2. Audio is via C1 and C2 of each channel,served coupling signals to VR1 and VR2. To adjust the audio to the Fet Q1.Which it serves, including audio. Then expand signal the output pin S through C3 For coupling signal again, before leaving to the output.
This is the idea of the simple audio mixer circuit. Perhaps you might need to take advantage of it.
Buy 2N3819 Here!
Some time you want high gain than FET, I think an OP-AMP IC is good way for you. The LF353 has JFET within it so very well same common FET but it has many components inside it, makes high gain and better than 2N3819 but in normal using we may need it because too cost in some places.
Audio Mixer by IC LF353
This is a very simple 4-channel audio mixer. We used a number IC of LF353 is the main equipment, the function of each channel combined with upper signal level. They is low noise for J-fet op-amp IC (NO. View to LF353)
3 CH MIC preamplifier with Mixer using LM348
If you are looking for a mixer with a microphone, and can easily make your own.I highly recommend this circuit.It is a microphone pre-amplifier for 3-channel or 3-channel mixer itself. When looking at the circuit, we have featured the use of a single integrated circuit LM348. The internal structure of the four IC-741 ICs. When It costs was similar, thus allowing us to save all of IC-741 and convenient to use than one x 4pcs.
And we can adjust the volume, each microphone freely by VR1,VR2,VR3. But this circuit used to the dual power supply +12V -12V and GND that should be dc voltage regulator with IC-7812,7912 or transistor follow you want.
–Power Regulator +12V_-12V by 7812 , 7912
You should preamplifier before enter single to power amplifier because the out of this circuit is low power.
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