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AMAZON multi-meters discounts AMAZON oscilloscope discounts 3. Medium-wave receiver using a ferrite-rod aerial 5. Experiments with the NE555 timer 6. Metronome 11. Waves -- Part 2 12. LED flasher 13. Waves -- Part 3 15. Aerial tuning unit for a receiver 17. Receiving aerials for amateur radio 18. The Colt 80m receiver -- Part 1 20. Varactor (or varicap) diode 21. Portable radio for medium waves 22. Colt 80m receiver -- Part 2 24. Introduction to transmitters 25. Colt 80m receiver -- Part 3 26. Two-way Morse practice system 27. Colt 80m receiver -- Part 4 30. A simple short-wave receiver -- Part 1 31. Fruit-powered medium-wave radio 33. Short-wave receiver -- Part 2 34. Continuity tester 35. Charger for NiCad batteries 36. 80 meter crystal-controlled CW transmitter 37. Solar-powered MW radio 38. Receiver for the 7MHz amateur band 39. Diodes for protection 40. RF signal probe 41. RF changeover circuit 42. Low-light indicator 43. J-pole aerial for 50 MHz 44. Measuring light intensity -- the photometer 45. 70 cm Quad loop aerial 46. UHF field strength meter 47. Christmas tree LEDs 48. Audio signal injector 49. Standing waves 50. Standing-wave indicator for HF 51. Moisture meter 52. Simple aerials 53. Breadboard 80 cm CW transmitter 54. 7-element low-pass filter for transmitters 55. Radio-frequency mixing explained 56. voltage monitor for a 12V power supply 57. 1750Hz toneburst for repeater access 58. Circuit for flashing LEDs 59. Digital logic circuits 60. Resistive SWR indicator 61. Audio filter for CW 62. Electronic die 63. Absorption wavemeter 64. HF absorption wavemeter 65. Vertical aerial for 70 cm 66. UHF corner reflector aerial 67. A switched dummy load 68. Morse oscillator 69. Bipolar transistor tester 70. The 'Yearling' 20m receiver 71. Adding the 80 meter band to the Yearling receiver 72. How the Yearling works 73. A field strength meter 74. Preselector for a short-wave receiver 75. An audible continuity tester 76. Experimental 70 cm rhombic aerial 77. Water level alarm 78. Delta loop for 20 meters 79. Simple desk microphone 80. Morse oscillator 81. A simple 6m beam 82. Integrated circuit amplifier 83. A novice ATU 84. CW QRP transmitter for 80 meters 85. Audio booster for your hand-held 86. Grid dip oscillator 87. CW transmitter for 160 to 20 meters 88. Matching the end-fed random-wire aerial Although we are surrounded by sophisticated computerized gadgets these days, there is still a fascination in putting together a few resistors, capacitors and the odd transistor to make a simple electronic circuit. It is really surprising how a handful of components can perform a useful function, and the satisfaction of having built it yourself is incalculable. This guide aims to provide a wide variety of radio and electronic projects, from something that will take a few minutes to a more ambitious weekend's worth. Various construction techniques are described, the simplest requiring no more than a small screwdriver, the most complex involving printed circuit boards. The projects were all chosen to be useful and straightforward, with the emphasis on practicality. In most cases the workings of the circuit are described, and the projects are backed up by small tutorials on the components and concepts employed. In the 21st century it may seem strange that few of the published circuits use integrated circuits (chips). This is intentional as it is much easier to understand how the circuit works when using discrete components. Anyone engaging in this guide will find that it will lead to hours of enjoyment, some very useful and entertaining gadgets, and increased knowledge of how and why electronics circuits work, and a great sense of satisfaction. Beware, electronic construction is addictive! |
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