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NO. Name Description
10 Phono Preamplifier Simple circuitry suitable for moving-magnet cartridges
Passive high-frequency equalization
11 Digital Remote Thermometer Remote sensor sends data via mains supply
Temperature range: 00.0 to 99.9 °C
12 Three-Level Audio Power Indicator Battery-operated 3 LED display
Simply connect it to loudspeaker output
13 1KHz Sinewave Generator Simple circuitry, low distortion, battery operated
Variable, low impedance output up to 1V RMS
14 LED or Lamp Flasher Minimum parts counting
Designed for 3V battery operation
15 Fridge door Alarm Beeps if you leave open the door over 20 seconds
3V battery operation, simple circuitry
16 Room Noise Detector One LED monitors three levels: 50, 70 & 85 dB
Useful to detect too noisy environments
17 Self-powered Sine to Square wave Converter Converts sine to square waves without a power-source
Useful as a test instrument for audio purposes
18 Plants Watering Watcher Varying brightness LED signals the necessity to water a plant
Very low consumption, 3V powered circuit
19 Cranial Electrotherapy Stimulator Current generated flows through clips placed on the earlobes
Output current adjustable from 80 to 600 microAmperes

 
 

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