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25
Turn on the slide switch (S1); the display on the LED-MC (U29) shows
“00”. Press the A button on the selector (S8) to increase the ones digit on
the display, and press the C button on the selector to increase the tens
digit on the display. When the display shows “21”, press the B button on
the selector to start.
Strange sounds will be heard on the speaker (SP2).
Project 42
Funky Siren
Use the preceding circuit, but add a connection between the points
marked B & C using a 1-snap and a 2-snap. The sound is different now.
Use the preceding circuit, but remove the connection between B & C,
and add a connection between C & D. The sound is different now.
Project 43 Funky Siren (II)
Project 44 Funky Siren (III)
Use the preceding circuit, but remove the connection between C & D,
and add a connection between A & D. The sound is different now.
Project 45 Funky Siren (IV)
Use the project 42 circuit, but remove the connection between C & E,
and add a connection between D & E using a blue jumper wire. The
sound is different now.
Project 46 Funky Siren (V)
Turn on the slide switch (S1); the display on the LED-MC (U29) shows
“00”. Press the A button on the selector (S8) to increase the ones digit on
the display, and press the C button on the selector to increase the tens
digit on the display. When the display shows “21”, press the B button on
the selector to start.
The “2” in the display will be toggling on/off at a varying rate.
Project 47
Vibrato 2
Use the preceding circuit, but add a second blue jumper between
points A & B. Now both digits on the display are toggling, but opposite
to each other.
Project 48 Vibrato 21
The LED MC (U29) is turning on the alarm
IC (U2) in short bursts, and varying their duration.
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