Telegraph; Mosquito Sound; Mosquito Sound (Ii); Mosquito Sound (Iii) - Elenco Electronics Snap Circuits Instruction Manual

Project #347
Project #349
Mosquito
Sound (II)
OBJECTIVE: Show variations of project 347.
Use the circuit in project 347. Connect the
whistle chip (WC) across points B & E.
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OBJECTIVE: Making telegraph sounds.
Press the 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
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.
Project #350
Mosquito
Sound (III)
OBJECTIVE: Show variations of project 347.
Use the circuit in project 347. Connect the
whistle chip (WC) across points E & D.

Telegraph

Project #348

Mosquito Sound

Project #351
Touch-Control
Mosquito Sound
OBJECTIVE: To use the photo resistor to
adjust the oscillator sound.
Use the circuit in project 347. Replace the
100kΩ resistor (R5) with the photo resistor
(RP). Wave your hand over the resistor and
the sound changes.