About: http://webisa.webdatacommons.org/17000493

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Input signal, for example microphone goes to pin 3 of IC. Its really simple circuit using just 6 elements including speaker and battery.
http://www.w3.org/ns/prov#wasQuotedFrom	wordpress.com