Data Sheet
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267. Distant Siren with Indicator
Replace the switch (62) in project #257 with the press switch (61).
Press and hold the press switch (61) and you will hear some low volume
sounds of a police siren from the speaker (93). Also, you will see the
heart LED (69) is ashing at the same time. In this circuit the heart LED
(69) is in series with the speaker (93), so the voltage drop across the
heart LED (69) reduces the voltage across the speaker (93) reducing
the volume of the sound.
268. Battle Far, Far Away
Connect points C and D with a 4-wire (4) in project #267. Press and
hold the press switch (61) and you will hear gun shots in low volume and
the heart LED (69) with ash at the same time. The red light indicator
will help indicate sounds from the speaker (93) if the room is noisy and
sounds are hard to hear. These are special effects for a space battle
in a galaxy far away.
269. Non-Polarity Speaker
Connect points A and B with a 4-wire (4) in project #267. Press and
hold the press switch (61) and you will hear a re siren in low volume
and the heart LED (69) will icker at the same time. Try turning the
speaker (93) around in this circuit. You will still hear the same sound.
This shows that the speaker is a non-polarity component since it works
both directions.
270. In a Galaxy Far, Far Away
Connect points E and F with a 4-wire (4) in project #267. Press and
hold the press switch (61) and the sounds of space battle will turn on
in low volume with the heart LED (69) ashing with each sound. The
ashing red light from the heart LED (69) is indicator that there is
sound in case the room is noisy.
271. Audio Spectrum Display
Connect points G and H with a 4-wire (4) in project #267. Press and
hold the press switch (61) and you will hear music in low volume and
the heart LED (69) will change to the music. This is a crude example of
how an audio spectrum display works on an amplier/music system.
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