Miniature IC Organ Circuit

Here is a circuit for an miniature IC organ using 3-volt AF amplifier IC TDA2822. Frequency of the AF sound generated depends on the capacitor between pin 1 and pin 7 of IC. When switch SW1 to SW10 are pressed, different audio tones are heard from the speaker. SW1 to SW10 are small push-to-on switches. Pin 2 of IC is connected to positive terminal of 3-volt battery. Two pen cells connected in series can be used to power this circuit. Satisfactory loud sound will obtained at 3-volt supply.

Note: Capacitors C6, C8, C9, C10, C11, C12 are parallel combination of two or three capacitors to obtained the odd values.

circuit diagram of miniature ic organ

PARTS LIST MINIATURE IC ORGAN

Resistor (all ¼-watt, ± 5% Carbon)

R1 = 10 KΩ

R2 = 1 KΩ

Capacitors

C1 = 470 µF, 10V (Electrolytic Capacitor)

C2, C4 = 0.01 µF (Ceramic Disc)

C3 = 1 µF, 10V (Electrolytic Capacitor)

C5 = 0.02 µF (Ceramic Disc)

C6 = 0.03 µF (Ceramic Disc)

C7 = 0.04 µF (Ceramic Disc)

C8 = 0.05 µF (Ceramic Disc)

C9 = 0.06 µF (Ceramic Disc)

C10 = 0.07 µF (Ceramic Disc)

C11 = 0.08 µF (Ceramic Disc)

C12 = 0.09 µF (Ceramic Disc)

C13 = 0.1 µF (Ceramic Disc)

Semiconductors

IC1 = TDA2822 (Dual Power Amplifier IC)

Miscellaneous

LS1 = 8Ω, loudspeaker

SW1 – SW10 = Push-To-On Switch

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