104 EASY Projects for the Electronics Gadgeteer by Robert Michael, Brown

By Robert Michael, Brown

This might rather well be a publishing first—a ebook dedicated to the idea that almost all of the true enjoyable in digital tinkering is derived from scrounging and swiping, trial and blunder, and stable, previous - shaped reasonable - skating. Youll be stunned on the worthwhile and enjoyable stuff you can prepare with a bit mind's eye and to be had components.
Youll be much more stunned in the event you discover what could be refrained from tubes or transistors! the aim of this publication is to offer you a few nutrition for inspiration alongside those traces and to clue you in on a few methods of the exchange in getting the main for the least.
Contents
Introduction 9
Homebrew gentle Meter 13
Tubeless/Transistorless Code perform visual display unit 14
Electric mix Lock 15
Super Crystal Radio 16
Surplus Relay Lamp Flasher 17
Signal Generator 19
Electronic Thermometer 20
Audio Frequency Meter 21
Dry- cellphone Rejuvenator 23
Flashgun Tester 24
Ultra-Cheap sign Generator 25
TV Set Radio Receiver 27
Hi-Fi Tuner 28
Inexpensive Early Morning Alarm 30
Double Battery provide For the automobile 31
Sonalert Intrusion Alarm 32
Hi-Fi within the motor vehicle 33
A «Whistler» Listening equipment 34
TV Ghost Eliminator 36
Adjustable Noise Generator 37
Professional Hygrometer 38
Perpetual Flasher 40
Tone Compensator For Tape Recorders 41
Electronic Tone Generator 42
9-Volt Battery Charger 43
Super box power Meter 44
Telephone Intercom Adapter 46
Neon Bulb Oscillator 47
Add-On Noise Limiter 48
Full-Wave Noise Limiter 50
CB- To-Auto Antenna Adapter 51
Audio Wattmeter 52
Inexpensive vehicle Battery Charger 54
Simple Crystal Detector 56
Super Band Spreader 57
Tunnel Diode Oscillator 58
Signal Blinker 59
Loudspeaker-To-Mike Converter 60
Electronic «Coin Toss» 61
Inexpensive Voltage Tri pi er 63
Line Voltage keep an eye on Unit 64
1000-Volt Buzzer strength offer 65
Blow-Out Protector For Loudspeakers 67
Inexpensive Transistor Checker 69
Free-Power Batteryless energy offer 71
Electrostatic Speaker Converter 72
Two television units With One Antenna 74
Tube Rejuvenator 75
Oscilloscope Calibrator 77
Sequential Neon Flasher 79
Electrifying malicious program Turner 80
Power provide From Filament Transformers 82
Color television photograph Roll Stopper 83
Electronic Anemometer 84
Bubble Lamp evening Lite 86
Scratch clear out For forty five RPM Discs 88
Subminiature energy offer 89
The secret Alarm 90
Junkbox Modulation Indicator 91
Darkroom Timer regulate 93
Effective 6-Meter Antenna Coupler 95
Tubeless Audio Squelch 96
AI I-Purpose Battery Charger 97
«Beeper» Transistor Tester 99
Simplest box power Meter 100
Electronic Reflex-Action video game 101
Kilowatt RF Voltmeter 103
FM Tuner To Hi-Fi Adapter Unit 104
Light Dimmer 105
SCR Diode Checker 106
Mechanized Polarity Reverser 108
«Instant-On» equipment Adapter 109
Cheater twine Cure-Ail 110
Automatic Frequency Finder 111
Worlds most cost-effective Intercom 113
150-Volt common energy provide 114
An digital Shaver Converter 115
Shave-In-Your-Car Adapter 116
Romantic mild Dimmer 117
Taped CQER machine 119
«The tourist» automated residence change 121
9-Volt TR Battery Eliminator 122
Simplest Noise Limiter 123
Slide-Switch Loudness keep an eye on 124
99tf Stroboscope 126
12? Lightning Detector 127
Neon Bulb AC/DC Voltmeter 128
Simple RC Tester 129
Hi-Fi Notch filter out 131
Tubeless/Transistorless AM Modulator 132
Automatic photograph Slide Projector 133
Handy Tube Tester 135
AC Line Alarm 136
Super-Regen S Meter 138
Tubeless Loudspeaker CPO 139
Light Bulb energy Measurer 140
RF «Sniffer» Probe 141
Cheap Push-To-Talk Relay 142
Direct-Reading CB energy Wattmeter 143
Voltage Regulator Hash capture 145
Universal AC Relay Silencer 146
Bike Generator AC-To-DC Converter 147
Foolproof Sequential Switching Adapter 148 Shortwave Trimmer-Booster For classic Receivers 149

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Extra info for 104 EASY Projects for the Electronics Gadgeteer

Example text

2-6. From a total power loss standpoint, 300-400-V MOSFETs compete with bipolar transistors only if the switching frequency is in excess of 30- 100 kHz. However, no definite statement can be made about the crossover frequency because it depends on the operating voltages, with low voltages favoring the MOSFET. Metal- oxide- semiconductor field effect transistors are available in voltage ratings in excess of lo00 V but with small current ratings and with up to 100 A at small voltage ratings. The maximum gate-source voltage is 2 2 0 V, although MOSFETs that can be controlled by 5-V signals are available.

0 V for the 5-7-kV devices. 2. Inverter-grade thyristors. These are designed to have small turn-off times tq in addition to low on-state voltages, although on-state voltages are larger in devices with shorter values of tq. These devices are available with ratings up to 2500 V and 1500 A. Their turn-off times are usually in the range of a few microseconds to 100 ps depending on their blocking voltage ratings and on-state voltage drops. 3. Light-activated thyristors. These can be triggered on by a pulse of light guided by optical fibers to a special sensitive region of the thyristor.

2-6a. 2-2 Consider the resistive-switching circuit shown in Fig. P2-2. V, = 300 V, f’ = 100 kHz and R = 75 a, so that the on-state current is the same as in Problem 2-1. Assume the switch turn-on time to be the sum of tri and tf, in Problem 2-1. Similarly, assume the turn-off time to be the sum of r,, and tfi. Figure P2-2 Assuming linear voltage- and current-switching characteristics, plot the switch voltage and current and the switching power loss as a function of time. Compare the average power loss with that in Problem 2- 1.

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