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Some types of electronic components can be super-miniaturized, allowing many thousands of parts to fit into an area smaller that your fingernail. These “integrated circuits” (ICs) are used in everything from simple electronic toys to the most advanced computers. The IC's in Snap Circuits® are actually modules containing specialized sound-generation ICs and other supporting components (resistors, capacitors, and transistors) that are always needed with them. This was done to simplify the connections you need to make to use them. The descriptions for these modules are given here for those interested.

U1, U2, and U3Edit

It plays the sound which is recorded by the person who made snap circuits. In U2 and U3, it makes it so it plays the recording again right after it ends. U1 plays "Happy Birthday" (formerly Fur Elise) song. U2 makes a siren or a gun sound. U3 makes 8 space sounds.

U4Edit

This amplifier have some transistor to make a sound louder. It doesn't have a recording.

U5Edit

It has some transistor to make a high power which is needed in radio.

U6Edit

It had 3 pre-recorded songs. You can record the sound in U6 but will be erased if you disconnect a battery.

The three pre-recorded songs are Christmas carols. They are "Sleigh Ride", "Jingle Bells", and "Angels We Have Heard on High"

U7Edit

It is a motion detector. It has a len and if it detects a motion, it will connect a wire.

U8Edit

It is a motor control. It has transistor that control the motor and motor direction.

U9Edit

You can make a tone and record a sound and will not be erased if you disconnect a battery.

U1 (Music IC)
U1

Debut

Sound Activated Switch

Class

U

U2 (Alarm IC)
U2

Debut

Space War Alarm Combo

Class

U

U3 (Space War IC)
U3

Debut

Space War Alarm Combo

Class

U

U4 (Amplifier IC)
U4

Debut

Old-Style Typewriter

Class

U

U5 (High Freq. IC)
U5

Debut

AM Radio

Class

U

U6 (Recording IC)

Debut

Playback & Record

Class

U

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