EP-130 62315RevC.qxp EP-130 062812 6/23/15 11:16 AM Page 1 ELECTRONIC TM PLAYGROUND and LEARNING CENTER MODEL EP-130 ELENCO Wheeling, IL, USA Copyright 2015, 2009 by Elenco Electronics, Inc. All rights reserved. REV-C Revised 2015 753039 No part of this book shall be reproduced by any means electronic, photocopying, or otherwise without written permission from the publisher.EP-130 62315RevC.qxp EP-130 062812 6/23/15 11:16 AM Page 2 Important: If you encounter any problems with this kit, DO NOT RETURN TO RETAILER. Call toll-free (800) 533- 2441 or e-mail us at: help elenco.com. Customer Service 150 Carpenter Ave. Wheeling, IL 60090 U.S.A. WARNING: Always check your wiring before Batteries: turning on a circuit. Never leave a circuit Do not short circuit the battery Non-rechargeable batteries should not unattended while the batteries are installed. terminals. be recharged. Rechargeable batteries Never connect additional batteries or any should only be charged under adult other power sources to your circuits. Never throw batteries in a fire or supervision, and should not be attempt to open its outer casing. recharged while in the product. WARNING: Use only 1.5V AA type, alkaline Do not mix old and new batteries. batteries (not included). CHOKING HAZARD - Small parts. Remove batteries when they are used Not for children under 3 years. Insert batteries with correct polarity. up. Do not mix alkaline, standard (carbon- Batteries are harmful if swallowed, so Conforms to all applicable U.S. government zinc), or rechargeable (nickel- keep away from small children. requirements. cadmium) batteries. TABLE OF CONTENTS Before We Begin Page 4 III. LED DISPLAY CIRCUITS 36 Installing the Batteries 4 23. LED Display Basics 37 Making Wire Connections 5 24. Digital Display Circuit for the Seven-Segment LED 38 Components 5 25. LED Display with CdS and Transistor 39 Building Your First Project 9 26. Switching the LED Display Using Transistor Control 40 Troubleshooting 10 IV. WELCOME TO DIGITAL CIRCUITS 41 Helpful Suggestions 10 27. Flip-Flop Transistor Circuit 42 I. PLAYGROUNDOFELECTRONICCIRCUITS 11 28. Toggle Flip-Flop Transistor 43 1. Woodpecker 12 29. AND Diode Transistor Logic with LED Display 44 2. Police Siren 13 30. OR DTL Circuit with Display 45 3. Metronome 14 31. NAND DTL Circuit with Display 46 4. Grandfather Clock 15 32. NOR Transistor Circuit with Display 47 5. Harp 16 33. Exclusive OR DTL Circuit 48 6. Tweeting Bird 17 V. MORE FUN WITH DIGITAL CIRCUITS 49 7. Meowing Cat 18 34. BUFFER GATE using TTL 50 8. Calling Fish 19 35. INVERTER GATE using TTL 51 9. Strobe Light 20 36. AND GATE using TTL 52 10. Sound Effects for Horror Movies 21 37. OR GATE using TTL 53 11. Machine Gun Oscillator 22 38. R-S Flip-Flop using TTL 54 12. Motorcycle Mania 23 39. Triple-Input AND Gate using TTL 55 13. Vision Test 24 40. AND Enable Circuit using TTL 56 14. Patrol Car Siren 25 41. NAND Enable Circuit using TTL 57 42. NOR Enable Circuit using TTL 58 II. BASIC ELECTRONICS CIRCUITS 26 43. NAND Gate Making a Toggle Flip-Flop 59 A MAJOR CHANGE 27 44. Exclusive OR GATE using TTL 60 15. Dimming the Light 28 45. OR Enable Circuit using TTL 61 16. Flip Flopping 29 46. Line Selector using TTL 62 17. Capacitor Discharge Flash 30 47. Data Selector using TTL 63 18. Transistor Action 31 19. Series and Parallel Capacitors 32 20. Transistor Switching 33 21. Series and Parallel Resistors 34 22. Amplify the Sound 35 -2-