Elenco Upgrade Kit SC500 to SC750 - Manual (Page 66)

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Project #650
OBJECTIVE: To use the alarm IC with the 7-segment display.
Segment Jumper
Turn the slide switch (S1) on; segments A, B, and F light and then
segments C, D, and E. The two groups of segments are connected to
different voltages. As the voltage changes from high to low, the
segments toggle back and forth.
Project #651
OBJECTIVE: To use the alarm IC with the 7-segment display.
DP & Zero Flasher
As in project #650, we use the alarm IC (U2) to flash segments and
LED’s. Turn the slide switch (S1) on and the number “0” and the green
LED (D2) flash as the speaker (SP) sounds. When they turn off, the
DP segment lights.