CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 1 Copyright © 2014 by Elenco® Electronics, Inc. All rights reserved. No part of this book shall be reproduced by any means; electronic, photocopying, or otherwise without written permission from the publisher.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 2 Table of Contents Basic Troubleshooting 1 Parts List 2 How to Use Circuit Maker Skill Builder 125 3 About Your Circuit Maker Skill Builder 125 Parts 4, 5 Introduction to Electricity 6 DOs and DON’Ts of Building Circuits 7 WARNING: SHOCK HAZARD - Never connect Circuit Maker Skill Builder 125 to the electrical outlets in your home in any way! ! WARNING FOR ALL PROJECTS WITH A ! SYMBOL Moving parts.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 3 Parts List (Colors and styles may vary) Symbols and Numbers Important: If any parts are missing or damaged in shipping, DO NOT RETURN TO Target. Call toll-free (800) 533-2441 or e-mail to help@elenco.com. Customer Service ● 150 Carpenter Ave. ● Wheeling, IL 60090 U.S.A. Qty. ID r1 Name Symbol Part # Qty. ID Name Base Grid (11.0” x 7.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 4 How to Use Circuit Maker Skill Builder 125 Circuit Maker Skill Builder 125 uses building blocks with snaps to build the different electronic circuits in the projects. Each block has a function: there are switch blocks, light blocks, battery blocks, different length wire blocks, etc. These blocks are different colors and have numbers on them so that you can easily identify them.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 2:51 PM Page 5 About Your Circuit Maker Skill Builder 125 Parts (Part designs are subject to change without notice). BASE GRID The base grid is a platform for mounting parts and wires. It functions like the printed circuit boards used in most electronic products, or like how the walls are used for mounting the electrical wiring in your home. BATTERY HOLDER The batteries (B1) produce an electrical voltage using a chemical reaction.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 6 About Your Circuit Maker Skill Builder 125 Parts SPEAKER MOTOR The motor (M1) converts electricity into mechanical motion. An electric current in the motor will turn the shaft and the motor blades, and the fan blade if it is on the motor. Motor (M1) How does electricity turn the shaft in the motor? The answer is magnetism.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 2:51 PM Page 7 Introduction to Electricity What is electricity? Nobody really knows. We only know how to produce it, understand its properties, and how to control it. Electricity is the movement of sub-atomic charged particles (called electrons) through a material due to electrical pressure across the material, such as from a battery. There are two ways of arranging parts in a circuit, in series or in parallel.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 8 DOs and DON’Ts of Building Circuits After building the circuits given in this booklet, you may wish to experiment on your own. Use the projects in this booklet as a guide, as many important design concepts are introduced throughout them. Every circuit will include a power source (the batteries), a resistance (which might be a resistor, capacitor, speaker, integrated circuit, etc.), and wiring paths between them and back.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 9 Advanced Troubleshooting (Adult supervision recommended) ELENCO® is not responsible for parts damaged due to incorrect wiring. If you suspect you have damaged parts, you can follow this procedure to systematically determine which ones need replacing: 1. 2.5V lamp (L1), motor (M1), speaker (SP), and battery holder (B1): Place batteries in holder. Place the 2.5V lamp directly across the battery holder, it should light.
CM-125_Manual_031514.
CM-125_Manual_031514.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 12 Project #1 Turn on the Light Circuit Maker Skill Builder 125 uses electronic blocks that snap onto a clear plastic grid to build different circuits. These blocks have different colors and numbers on them so that you can easily identify them. Build the circuit shown on the left by placing all the parts with a black 1 next to them on the board first. Then, assemble parts marked with a 2.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 13 Project #3 Super Circuit Placement Level Numbers This complex circuit is pictured on the box cover. Use that as a guide to help in building it. + ! WARNING: Moving parts. Do not touch the fan or motor during operation. Do not lean over the motor. ! WARNING: Fan may not rise until switch is released. Circuit Maker Skill Builder 125 uses electronic blocks that snap onto a clear plastic grid to build different circuits.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 14 Project #4 Space War Build the circuit shown on the left, which uses the space war integrated circuit. Activate it by flipping the slide switch (S1) or pressing the press switch (S2), do both several times and in combination.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 15 Project #7 Stick Around Saucer + Build the circuit shown on the left which is the same as the circuit in Project #2 but with the motor part reversed. Place the glow fan on the motor. Turn on the slide switch (S1), wait for the motor to reach full speed, then turn off the switch. This time, the glow fan does not fly because the fan is now rotating in the opposite direction such that the airflow is pushing the fan downward.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:24 PM Page 16 Project #9 The parts are arranged as a series circuit. You can swap the locations of any of the parts without affecting circuit operation. Spin & Dim Build the circuit shown on the left. When you turn on the slide switch (S1), the fan will spin and the lamp (L1) should turn on. The fan will take a while to start turning due to inertia.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 17 Project #11 The Diode Dude Build the circuit shown on the left. When you turn on the slide switch (S1), current flows from the batteries (B1) through the switch, through the 100W resistor (R1), through the LED (D1, light emitting diode) and back to the battery. The turned on switch completes the circuit. The resistor limits the current and prevents damage to the LED.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 18 Project #13 Clippy the Conductor Rebuild the circuit from Project #11 but leave the slide switch (S1) out as shown on the left. When you place a paper clip across the terminals as shown in the picture on the left, current flows from the batteries (B1) through the 100W resistor (R1), through the LED (D1), and back to the battery. The paper clip completes the circuit and current flows through the LED.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 19 Project #15 Mumbling Motor Place the fan on the motor (M1). Press the press switch (S2) and listen to the motor. Why does the motor make sound? + If you replace the motor with the 2.5V lamp (L1), then it will work the same as the “Hear the Motor” project, but only make noise when the lamp is turned ON or OFF. A motor uses magnetism to convert electrical energy into mechanical spinning motion.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 20 Project #17 Hi-Low Fan Build the circuit shown on the left. ! WARNING: Moving parts. Do not touch the fan or motor during operation. When you close the slide switch (S1), current flows from the batteries through the slide switch (S1), motor (M1), the lamp (L1), and back to the battery (B1). When the press switch (S2) is closed, the lamp is shorted and motor speed increases.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 21 Project #19 Magical Music Build the circuit shown on the left. When you turn on the slide switch (S1), the music integrated circuit (U1) may start playing one song then stop. Each time you press the press switch “doorbell button” (S2) the song will play again and stop. Even if you let go of the press switch (S2), the integrated circuit keeps the song playing until it has reached the end of the song.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 22 Project #21 Simple Siren Build the circuit shown on the left. When you turn on the slide switch (S1), the integrated circuit (U2) should start sounding a very loud alarm sound. This integrated circuit is designed to sweep through all the frequencies so even hard of hearing people can be warned by the alarm.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:26 PM Page 23 Project #23 Build the circuit below. It uses a paper clip and a 3-Snap Wire as “shorting bars”. Setup: Player 1 sets the target by placing the 3-snap shorting bar under the paper on column 2, 3 or 4. Player 2 must NOT know where the shorting bar is located under the paper.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 24 Project #24 Don’t Make a Sound Use the circuit from Project #23, but now place a 3-snap wire and the LED (D1) as “shorting bars” under the paper sheet as shown on left. Setup: Player 1 sets the “Quiet Zone” by placing the 3-snap wire and the LED (D1) under the paper on columns 2, 3 or 4, leaving only one open. Player 2 must NOT know where these “shorting bars” are located under the paper.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 25 Project #26 Shine On Siren Build the circuit shown on the left. Cover the photoresistor (RP) and turn on the switch (S1). A police siren is heard for a while and stops, then you can control it by covering or uncovering the photoresistor. This circuit demonstrates how sounds can be synchronized to light patterns through the photoresistor. Project #27 Shooting Sounds Modify Project #26 by connecting points X & Y.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 26 Project #31 Transistor Control Project #32 Slow & Bright Place the fan on the motor (M1) and turn on the slide switch (S1) - nothing happens. Push the press switch (S2), the lamp lights and the motor spins. ! WARNING: Moving parts. Do not touch the fan or motor during operation. The NPN transistor (Q2) uses the lamp current to control the motor current.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 27 Project #35 Mixed Up Music In the circuit, the outputs from the alarm and music ICs are connected together. Build the circuit shown and then place the alarm IC (U2) directly over the music IC (U1), resting on two 1-snaps and a 2-snap. Turn on the switch (S1) and you will hear a siren and music together while the lamp (L1) varies in brightness.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 28 Project #39 Space Battle Build the circuit shown on the left. Turn on the switch (S1) and you will hear exciting sounds, as if a space battle is raging! The motor (M1) is used here as a 3-snap wire, and will not spin. Project #41 Sporadic Sounds Build the circuit shown on the left and turn it on. The lamp (L1) alternates between being on and off while the speaker (SP) alternates between two musical tones...
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 29 Project #43 Motor Magic This circuit is controlled by spinning the motor (M1) with your hands. Turn on the switch. A police siren is heard and then stops. Spin the motor and it will play again. Note, however, that music can be heard faintly in the background of the siren. This project shows how a motor can be used to convert mechanical energy to electrical energy and sound.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 30 Project #48 Wave & Watch This circuit does not use the noisy speaker (SP) but instead uses a nice quiet LED (D1). Turn on the slide switch (S1), the LED flickers. Wait a few seconds, and then cover the photoresistor (RP), and the flicker stops. The flicker is controlled by the photoresistor; uncover it and the flicker resumes. People that are deaf need lights to tell them when a doorbell is ringing.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 31 Project #50 Lingering Light Build the circuit and press the switch (S2). You see that the LED (D1) turns off slowly after you release the switch. This delay in turning off the LED is caused by the 470mF capacitor (C5). Capacitors can store electricity and are used to delay changes in voltage. They can block unchanging voltages while passing fast-changing voltages.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 32 Project #53 Auto-Off Night Light Build the circuit to the left. When you turn on the slide switch (S1) the first time the LED (D1) will come on and very slowly get dimmer and dimmer. If you turn the slide switch (S1) off and back on after the LED goes out it will NOT come on again. The 470mF capacitor (C5) has charged up and the NPN transistor amplifier (Q2) can get no current at its input to turn it on.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 33 Project #55 Reflection Detector Build the circuit to the left. Place it where there won’t be any room light hitting the photoresistor (RP) (such as in a dark room or under a table), and then turn it on. The 2.5V lamp (L1) will be bright, but there should be no sound. Take a small mirror and hold it over the lamp and photoresistor. You should hear sound now.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 34 Project #57 Laser Flasher When you press the press switch (S2), the integrated circuit should start sounding a very loud laser gun sound. The red LED will flash simulating a burst of laser light. You can shoot long repeating laser burst, or short zaps by tapping the press switch. This circuit demonstrates how toy laser guns can be designed.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 35 Project #59 Spinning Rings Setup: Cut out the disc on page #62 that looks like the one shown here. Using Scotch tape, attach the disc with the printed side up on the top of the fan blade. Place the blade on the motor as shown to the left and below. When the press switch (S2) is pressed, the arcs will turn into colored rings with a black background. Notice how the color drops in brightness when it is stretched to make a complete circle.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 36 Project #61 Race Game Modify Project #59 by adding the pointer as shown on the left. The paper should be cut from page #62 and taped high enough on the speaker so the pointer will stick over the fan with paper. Bend the pointer at a right angle as shown on the left. Setup: Cut out the grid with four (4) colors from page #62 and place it under the base as shown on the left.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 37 Project #63 Spin Draw Rebuild the simple motor connection as shown on the left. This is the same setup as Project #59. Setup: Cut out a circular piece of thin cardboard from the back of an old spiral notebook or note pad. Use the fan blade as a guide. Place the fan on the cardboard and trace around it with a pencil or pen. Cut the cardboard out with scissors and tape it to the fan blade.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 38 Project #65 Visual Volume Build the circuit shown on the left. Turn on the slide switch (S1), a police siren is heard. The loudness of the sound depends on how much light reaches the photoresistor (RP). Try partially shielding it or placing near a very bright light, and compare the sound. The photoresistor contains material that changes its resistance when it is exposed to light.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 39 Project #70 Pop On, Pop Off Turn the slide switch (S1) on and off several times. You hear static from the speaker (SP) when you turn off the switch. The speaker uses electromagnetism to create changes in air pressure, which your ears feel and interpret as sound. Think of the speaker as creating pressure waves in the air just like waves in a pool.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 40 Project #73 Little to Big Place the fan on the motor (M1) and turn on the slide switch (S1), then compare this circuit to Project #31. Push the press switch (S2), the lamp doesn’t light now but the motor still spins. The lamp is dark because the 100W resistor (R1) limits the current through it. The NPN transistor (Q2) uses the small lamp current to create a large current that spins the motor.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:19 PM Page 41 Project #76 Switch & Store Turn on the slide switch (S1) and the LED (D1) lights; it will not be very bright so turn off the room lights or hold your fingers around it to see it better. Push the press switch (S2) several times slowly; the LED and lamp (L1) go on and off. Push the press switch many times quickly - the lamp still goes on and off but the LED stays on.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 42 Project #78 Alien Alarm 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 (L1) brighter. Project #79 Same or “NOT” Build the circuit shown. Notice that when the press switch (S2) is pressed, the LED (D1) goes off. This is an example of an inverter circuit, or NOT gate.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 43 Project #80 This OR That Build the circuit shown. Notice that if you turn on the slide switch (S1) OR press the press switch (S2) the LED (D1) lights up. There is no partially lit state here, the diode is either totally on or totally off. While this may seem very simple and boring, it represents an important concept in electronics.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 44 Project #82 Neither This NOR That Build the circuit at left and test the combinations of the slide switch (S1) and press switch (S2). If you compare it to the OR circuit in Project #80, you can see the LED (D1) lights in the opposite combinations of that circuit. Hence, we refer to it as a NOR circuit (short for “NOT this OR that”). Like the OR and AND, it is an important building block in computers.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 45 Project #84 Two-way Light Switch Build the circuit on the left. Note that two of the 2-snaps are left unconnected on one end because they will be used as switches in this project. If you connect the free ends of each of these 2-snaps both to the “high bar” or positions B in the figure or both to the “low bar” or positions A in the figure, the LED (D1) lights up.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 46 Project #86 Light Makes Light Build the circuit to the left. Cover the photoresistor, turn the switch on, and notice that the LED is on for several seconds and then goes off. Uncover the photoresistor and place the unit near a light and the LED will light. Cover the photoresistor (RP) again and the LED will turn off.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 47 Project #89 Flashing Flare Build the circuit shown on the left. The circuit uses the Alarm and Space War ICs to flash the LED (D1). Turn the switch on and the LED starts flashing. Project #91 Project #90 Touch & Go Wet your fingers with some water or saliva and touch them across points A and B several times to hear some space war sounds. Push the press switch (S2) to hear more sounds at the same time.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 48 Project #92 Fan Flash Energy Place the fan on the motor (M1). Hold down the press switch (S2) for a few seconds and then watch the LED (D1) as you release the switch. The LED flashes briefly but only after the batteries (B1) are disconnected from the circuit. Do you know why the LED flashes? It flashes because the mechanical energy stored in the fan blade makes the motor act like a generator.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 49 Project #95 Fun with the Alarm IC Place the fan on the motor (M1) and turn on the slide switch (S1). The lamp (L1) lights, the motor spins, and you hear a machine gun sound (with very faint music in background). Thoroughly cover the photoresistor (RP) with your hand and the sound becomes a siren. After a while the sound will stop, hold down the press switch (S2) and the sound resumes.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 50 Project #98 Music Alarm Combo Build the circuit shown and then place the alarm IC (U2) directly over the music IC (U1), resting on the three 1-snaps. Turn on the slide switch (S1) and you will hear a siren and music together. After a few seconds, covering the photoresistor (RP) will stop the music (but the siren continues).
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 51 Project #101 Sing & Fling In the circuit, the outputs from the alarm and music ICs are connected together. Build the circuit shown and then place the alarm IC (U2) directly over the music IC (U1), resting on two 1-snaps and a 2-snap. Turn on the slide switch (S1) and you will hear a siren and music together while the lamp (L1) varies in brightness. Push the press switch (S2) and the fan spins, while the sound may not be as loud.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 52 Project #103 Long Gone Light Push the press switch (S2). If the fan is off the motor (M1) (or flies off) then the LED (D1) will be bright. It takes a lot of current to spin the motor when the fan is on it, and the voltage drops because the batteries (B1) cannot supply enough. When the fan flies off, the current drops and the voltage rises.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 53 Project #105 The Dark Dimmer Turn on the slide switch (S1) and push the press switch (S2). If there is light on the photoresistor (RP), then the LED (D1) will stay on for a long time after you release the press switch. The energy stored in the 470mF capacitor (C5) keeps the controlling current to the NPN transistor (Q2) on even though the press switch was turned off.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 54 Project #107 Sonic Flasher Set the slide switch (S1) on, a space war sound plays and the LED (D1) flashes. Cover the photoresistor (RP) and press the press switch (S2) to change the sound. See how many sounds are programmed into the space war sound IC (U3). Project #108 Stay or Blink Build the circuit and turn on the slide switch (S1).
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 55 Project #109 Glow & Go Build the circuit to the left. Turn on the slide switch (S1). The alarm will sound, as long as light is present. Slowly cover the photoresistor (RP), and the volume goes down. If you turn off the lights, the alarm will stop. The amount of light changes the resistance of the photoresistor (less light means more resistance).
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 56 Project #111 Light the Motor This circuit combines Projects #1, #2, and #10 into one circuit. Build the circuit and place the fan on the motor (M1). Depending on which of the switches (S1 and S2) are on, you can turn on either the lamp (L1) (Project #1), the motor (M1) (Project #2), or both together (Project #10). ! WARNING: Moving parts. Do not touch the fan or motor during operation.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 57 Project #114 This simple circuit can be used for communication. Press the press switch (S2) in long and short bursts to make a pattern of light flashes representing the dots and dashes shown in the Morse Code table below. You can use Morse Code and this circuit to send secret messages to some friends in the room without others knowing what you’re saying.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 58 Project #117 Touch of Light Build the circuit on the left. You’re probably wondering how it can work, since one of the points on the NPN transistor (Q2) is unconnected. It can’t, but there is another component that isn’t shown. That component is you. Touch points X & Y with your fingers. The LED (D1) may be dimly lit. The problem is your fingers aren’t making a good enough electrical contact with the metal.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:31 PM Page 59 Project #119 Electricity You Can Wear Snappy says: clothes can cling together because electricity is all around us. Find some clothes that cling together in the dryer, and try to uncling them. Rub a sweater (wool is best) and see how it clings to other clothes. The crackling noise you hear when taking off a sweater is static electricity. You may see sparks when taking one off in a dark room. These effects are caused by electricity.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 60 Project #121 Static electricity was discovered more than 2,500 years ago when the Greek philosopher Thales noticed that when amber (a hard, clear, yellow-tinted material) is rubbed, light materials like feathers stick to it. Electricity is named after the Greek word for amber, which is electron. Bending Water You need a comb (or plastic ruler) and a water faucet for this project.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 61 Project #123 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. Push the press switch (S2) and reset the circuit. The resistance of the photoresistor controls how long it takes to charge up the 470mF capacitor (C5).
CM-125_Manual_031514.
CM-125_Manual_031514.
CM-125_Manual_031514.qxp_CM-125_Manual_031514 4/2/14 12:20 PM Page 64 CM-125 Block Layout Important: If any parts are missing or damaged, DO NOT RETURN TO RETAILER. Call toll-free (800) 533-2441 or e-mail us at: help@elenco.com. Customer Service ● 150 Carpenter Ave. Note: A complete parts list is on page 2 in this manual. Wheeling, IL 60090 U.S.A.
