Snap Circuits 500-in-1 Manual

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Project #347
OBJECTIVE: Making telegraph sounds.
Press the press switch (S2) down. The circuit oscillates and the AC
voltage generated from the transformer (T1) drives the speaker (SP).
To make a telegraph sound, depress the switch for long and short
periods.
Telegraph
OBJECTIVE: Show variations of project
#347.
Use the circuit in project #347. Connect the
whistle chip (WC) across points B & E.
Mosquito
Sound (II)
Project #349
OBJECTIVE: Show variations of project
#347.
Mosquito
Sound (III)
Project #350
OBJECTIVE: To use the photoresistor to
adjust the oscillator sound.
Touch-Control
Mosquito Sound
Project #351
OBJECTIVE: Use the whistle chip to make a mosquito sound.
Use the circuit in project #347. Remove the speaker (SP). Connect
the whistle chip (WC) across points C & D to make a mosquito sound.
Mosquito Sound
Project #348
Use the circuit in project #347. Connect the
whistle chip (WC) across points E & D (place
it beneath capacitor (C2) or use the jumper
wires).
Use the circuit in project #347. Replace the
100kΩ resistor (R5) with the photoresistor
(RP). Wave your hand over the resistor and
the sound changes.