Institute Newton C. Braga

Mark generator (CB7526E)
Found in an English Maplin documentation from 1983, this circuit generates separate frequency...
Mini-Buzzer (CB459)
This circuit uses a piezoelectric transducer to produce sounds like a buzzer. Frequency is...
Guitar preamp (CB22146E) Found in an English publication from 1989, this circuit uses a still common operational amplifier. The power supply does not have to be symmetrical. a href="images/stories/bc/04291029"
Guitar preamp (CB22146E) Found in an English publication from 1989, this circuit uses a still...