Post Description

Review from user "streamline": A collection of articles & simple circuits - mostly small, simple construction items, many from EFY magazine. Contents: Handy Zener Diode Tester House Security System Low-Cost Transistorised Inverter Low Frequency Sinewave Generators Micromotor Controller Multipurpose Circuit for Telephones PC-based DC Motor Speed Controller PC-based Oscilloscope Pendulum Display Phone Broadcaster Powerful AM Radio Transmitter Designing an RF Probe Smart Fluid Level Indicator Smell sensors Shortwave AM Transmitter Watch-Dog for Telephones Touch Activated Light Unregulated Power Supply Nat. Semi. App. Note AN-233 Variable Power Supply Washing Machine Motor Controller Touch Dimmer Transistor Organ Friendly Charger for Mobile Phones LED Chaser Computerised Morse code generator/transmitter DC Motor Drive for a Dyno - Microcontroller and Power Electronics Decibel Meter Digital Dice with Numeric Display 6-Digit Frequency Counter Digital Volume Control Drill Speed Controller DTMF Proximity Detector Electronic Card-Lock System Electronic Number Lock Electronic Security System Electronic Stethoscope Fan Controller Fire Alarm Using Thermistor Long-life Flasher and Continuity Tester Flashing-cum-running Light Fluid Level Detector FM Beacon Broadcast Transmitter FM Transmitter Frost Alarm Fuel Reserve Indicator for Vehicles Heat Sensitive Switch Infrared Cordless Headphone Infrared Toy Car Motor Controller IR Remote Control & Decoder IC 12 Volt Lamp Dimmer LED Photo Sensor LED-based Message Display Low Cost Automatic Gate Light With A Musical Bell Low-cost Hearing Aid Low-Cost Transistorised Inverter Low Distortion Audio Preamplifier Night Light Ready to Use Object Counter Radio Control Electric Switch Radio Remote Control using DTMF Stacking Six A/B Station Selector Relays Add-on Stereo Channel Selector Telecom Headset Telephone Audio Interface The Super-Heterodyne Receiver