Class A BJT amplifier - audio mixer

284

08:37:35

An implementation of a Class A amp.  Capacitors act as isolators for the DC voltage, only letting the AC voltage through.

An audio mixer adds separate frequencies together to produce a single frequency.  With this circuit, you can have as many inputs as you want.

To increase the gain, we bypass the emitter resister with a capacitor.  This allows the AC voltage to go straight to ground without providing negative feedback.

The inputs have a different impedance value (The 50 and 600 resistors)  To accommodate for this, we swamp the input with a large resistance on both inputs, so the difference in impedance is negligible.

I included some switches to exclude a source if you wish.  Go ahead and play with the frequencies to see the output.

published 11 years ago

JidhinGeorge

10 years ago

What happens if I ground my Onkyo AV receiver? There is no noise from my receiver now! Can you clear my confusion that ground signal will pass through the audio ground or earth ground?

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