Elenco 130-in-1 Electronics Playground - Manual (Page 113)

-113-
Want to create an amplifier that mixes two tones
together? There are many different types of tone
mixing circuits, but the operational amplifier is
considered one of the best.
After you complete the wiring, slide the switch to
position A to turn on the power. Note the timbre (the
tone) of the sound produced. To mix this tone with
another, press the key. You can alter the two separate
tones by changing the values for the two 10k
Ω
resistors.
The tone mixer amplifier allows you to mix two tones
together by modifying resistances with no need to
change the other circuits.
Notes:
EXPERIMENT #94: TONE MIXER
Wiring Sequence:
1-29
2-30
3-49-91-119-124
5-67-90
50-51-85-106
52-53-54-87-86
55-88-105-113
56-57-75-110
58-59-60-76-77
78-61-109-111
62-70-134
63-131
68-82-84-89
69-92
81-112
83-138
114-137
121-135
122-132
Schematic