Tone Mixing Amplifier
Électronique / Electronic
NE5532, 7400

How about building a tone mixing amplifier that mixes two tones together?

There are many different kinds of tone mixing circuits, but the operational amplifier is considered one of the best. After completing the wiring, slide the switch to position ON to turn on the power.

Note the tone of the sound that is produced. Now press the key to mix this tone with an other. You can change the two separate tones by changing the values for the two 10K resistors.

Thus, the tone mixing amplifier allows you to mix two tones together by changing resistances with no need to change the other circuits.