Space War Alarm By Scr; Light Space War Alarm; Alarm By Scr; Light & Alarm Ic - Elenco Electronics Projects 306-511 Instruction Manual

Project #377
Project #379
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Space War Alarm by SCR

OBJECTIVE: To build an alarm circuit.
The circuit uses the space war IC (U3) and works the same way as
project #320. Remove the jumper wire and a space war sound plays.
Project #378

Light Space War Alarm

OBJECTIVE: To build an alarm circuit.
Use the circuit in project #377. Replace the resistor (R3) with the
photoresistor (RP) and remove the jumper wire.
photoresistor with your hand. Now slowly remove your hand. The
music plays when enough light hits the resistor.

Alarm by SCR

OBJECTIVE: To build an alarm circuit.
The circuit uses the alarm IC (U2) and works the same way as project
#377. Remove the jumper wire and an alarm IC sounds.
Project #380
Light & Alarm IC
OBJECTIVE: To build an alarm circuit.
Use the circuit in project #379. Replace the 10kΩ resistor (R4) with
the photoresistor (RP) and remove the jumper wire. When enough
light strikes the photoresistor, the Alarm IC (U2) plays. Cover the
photoresistor with your hand. Now slowly remove it, when enough light
hits the resistor, the IC plays.
Cover the