Project #594, Pulsing motor, Project #593 – Elenco Upgrade Kit SC100 to SC750 User Manual

Page 184: Noisemaker (iii)

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Project #594

OBJECTIVE: To create a pulsing motor circuit.

Pulsing Motor

Set the meter (M2) to the LOW scale. Turn on the slide switch (S1) and
now you have a pulsing motor and LED’s circuit. Replace the meter
with the 470

μF capacitor (C5, “+” on right) to change the rate the LED’s

(D1 & D2) flash.

Project #593

OBJECTIVE: To create a sound circuit.

Noisemaker (III)

Turn the slide switch (S1) on and the speaker (SP) sounds as if a
motor is spinning and an alarm is running. The relay’s (S3) contacts
rapidly open and close the battery connection to the circuit causing the
alarm IC (U2) sound to be different.

WARNING:

Moving parts. Do not touch the fan or

motor during operation. Do not lean over the motor.