Project #69, Space war siren project #70, Sunrise light – Elenco Electronics 202 User Manual
Page 42
-41-
Project #69
OBJECTIVE: To combine effects from the space war and alarm
integrated circuits.
Build the circuit shown on the left and turn on the slide switch (S1).
Press and hold the press switch (S2) to make the lamp (L2) brighter.
Space War Siren
Project #70
OBJECTIVE: To learn about one device that is used to delay
actions in electronics.
Sunrise Light
Cover the photoresistor (RP) and turn on the slide switch (S1). The
LED (D1) is off, but if you wait a long time then it will eventually light
up. Uncover the photoresistor and the LED will light up in just a few
seconds. Press the press switch (S2) and reset the circuit.
The resistance of the photoresistor controls how long it takes to
charge up the 470
μF capacitor (C5). Once the capacitor is charged,
current can flow into the NPN transistor (Q2) and turn on the LED.
Pressing the press switch discharges the capacitor.
- Upgrade Kit SC100 to SC300 (76 pages)
- Snap Circuits Jr.® Educational 100 Exp. (48 pages)
- Upgrade Kit SC300 to SC500 (64 pages)
- Snap Rover ® (24 pages)
- XP&trade (64 pages)
- Snap Circuits LIGHT ® (84 pages)
- Snap Circuits Extreme® Educational 750 Exp. (88 pages)
- Projects PC1-PC73 (60 pages)
- Snaptricity® (92 pages)
- Upgrade Kit SCROV10 to SCROV50 (48 pages)
- Snap Circuits Green ® (80 pages)
- C Adapter for Snap Circuits® (2 pages)
- Motion Detector Kit (20 pages)
- Digital Roulette Kit (16 pages)
- FM Wireless Microphone Kit (12 pages)
- AM Radio Kit (32 pages)
- AM Radio Kit (36 pages)
- AM/FM Radio Kit (64 pages)
- Circuit Maker Skill Builder 125 (64 pages)
- Circuit Maker Sound Plus 200 (80 pages)
- Understanding Logic Gates (16 pages)
- Understanding Logic Gates and Circuits (42 pages)
- Tumbling Robot (12 pages)
- Solar Energy (16 pages)
- C2D Scope (16 pages)
- 288x Astrolon Telescope with Aluminum Tripod (1 page)
- Simulated Frog Dissection Kit (1 page)
- Talking Galaxy Planetarium with Night Light (1 page)
- Night’n Day® (10 pages)
- Radio Controlled Black Widow (1 page)
- Handheld Microscope (2 pages)
- Water Filtration Kit (8 pages)
- 6-in-1 Solar Kit (18 pages)
- Microscope Set in Carrying Case (1 page)
- Mobile 20 Telescope (1 page)
- Mechanical Drum (20 pages)
- Aerial Screw (20 pages)
- Swing Bridge (20 pages)
- Printing Press (24 pages)
- MultiBarrel Cannon (20 pages)
- Armored Car (24 pages)
- Paddleboat (20 pages)
- SelfPropelled Cart (20 pages)
- Catapult (24 pages)