Firmtech FBS100BC, Быстрое руководство

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The Melody IC is configured to play a familiar melody "Für Elise" from a mini speaker from when the car moves in reverse.
The control method of this Melody IC is quite simple. This Melody IC plays the melody stored in the IC in analog form
when power is supplied to it. Generally, low-cost models look like TO220 type TR and consist of three legs. (Melody IC
Model used here is UM66T19L.) But, it is difficult to operate a mini speaker directly because the output current from the
Melody IC is very weak. Therefore, a simple TR amplifying circuit is used to amplify the melody played by the Melody IC
and operate the mini speaker.
3. Outline of the Melody IC control practice
PIO 6
The melody is played at the time when the
PIO6’s signal is Low.