The Build-it Book of Electronic Projects |
Contents
Soil Moisture Checker | 8 |
Flood Alarm and Liquid Level | 17 |
Tarry Light | 24 |
Copyright | |
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12 volts adjust alarm amplifier anode antenna Audio Tach Bakelite bulb button calibration capacitor C1 checker circuit clip coil collector components connected contacts current flow cycle Darlington transistor device diode D1 door drill electrical electrolytic capacitor electronic engine equiv given in Table ground hole hookup ignition ignition coil inches indicator lamp input installed jack lamp I1 lead List metal minibox monitor mounted neon neon lamp normal operation oscillator outlet output perf board phenolic photocell plastic plug position potentiometer probe pulse push-button switch Radio Shack rectifier reed relay relay K1 resistance resistor resistor R1 Schematic diagram Schmitt trigger SCR1 screws shown in Fig signal silicon controlled rectifier solder Sonalert sound stoplight strobe supply switch S1 tape Tarry Light Tell-A-Bell temperature terminal thermistor timer toggle switch transformer transistor Q1 transmitter triac trigger turn turn-signal unit Voltminder volts wire zener diode