More about the ICs in Snap Circuits Although Snap Circuits includes several parts that are called integrated circuits, they are actually modules containing a number of parts. The modules contain specialized sound-generation and amplifier 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. Music IC Alarm IC The music IC module contains sound-generation ICs and supporting components. It can play several musical tunes that are recorded in it. Its actual schematic is complex and looks like this: The alarm IC module contains a sound-generation IC and supporting components. It can make several siren sounds. Its actual schematic looks like this: Its Snap Circuits connections are like this: Its Snap Circuits connections are like this: (+) IN2 TRG HLD IN1 IN3 (–) OUT (–) OUT Music IC: (+) - power from batteries (–) - power return to batteries OUT - output connection Alarm IC: HLD - hold control input TRG - trigger control input IN1, IN2, IN3 - control inputs (–) - power return to batteries OUT - output connection Music for ~20 sec on power-up, then hold HLD to (+) power or touch TRG to (+) power to resume music. Connect control inputs to (+) power to make five alarm sounds. This module has two different control inputs. The OUT connection pulls current into the module (not out of it), usually from a speaker. This current is adjusted to make the music. Snap Circuits projects 15 and 16 show how to connect this part and what it can do. This module has three control inputs, and can make five siren sounds. The OUT connection pulls current into the module (not out of it), usually from a speaker. This current is adjusted to make the siren sounds. Snap Circuits project 17 shows a simple way to connect this part, and projects 113-117 show the connections needed to make the five possible sounds.
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