Elenco Upgrade Kit SC500 to SC750 - Manual (Page 42)

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Project #589
OBJECTIVE: To use AC voltage.
AC Voltage
Turn the slide switch (S1) on. The LED’s (D1 & D2) flash so fast that
they appear to be on, and the speaker (SP) sounds. As in other
projects, the relay’s (S3) contacts open and close rapidly. This causes
the magnetic field in the transformer (T1) to expand and collapse,
creating an AC voltage lighting the LED’s.
Project #590
OBJECTIVE: To use AC voltage.
AC Voltage (II)
You can modify project #589 by adding two light bulbs (L1 & L2).
When the slide switch (S1) is turned on, the relay (S3) sounds and the
light bulbs and LED’s (D1 & D2) flash.