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Electronic Analog Thermometer
new
Based on 2N2903
Anemometer
new
Air flow meter based on thermal sensor. Low cost anemometer.
Digital Capacitance meter
(Circuit on demand)
Capacitance meter measuring capacitance form micro to pico Farad range.
LED Voltmeter
(Circuit on demand)
Battery voltage monitor based on comparator and LED
OpAmp Tester
(Circuit on demand)
The circuit can test single, dual or quad OpAmp
Anemometer Home made
DC permanent magnet motor as the basis for anemometer
Anemometer
Anemometer 2
Breath alcohol tester
Digital Radar Speedometer
Allows to measure the speed of moving vehicle using RADAR. Speed is displayed in KPH.
Digital engine race meter
Measures the speed of engine using a microcontroller
Digital capacitance meter
Digital meter using a microcontroller.
Capacitance Meter
Use of Ferro magnetic material to measure capacitance.
Capacitance meter
Use of analog meter to see capacitance value.
Plant moisture sensor
Checks the amount of water in plant.
Plant watering watcher
Checks the amount of water in a pot plant.
Plant watering watcher 2
Plant watering watcher 3
Simple Battery Monitor
Uses zener diode and a variable resistor to adjust trip point.
12B Battery Condition Indicator
Indicates battery voltage in 10 different level.
Battery power indicator for pinball machine
Battery power monitor
LM3914 Battery Monitor
This circuit should be powered by its own battery, otherwise you might get an inaccurate reading
NiCad Battery Discharger/Capacity Indicator
12 Volt Battery Capacity Tester
Circuit tests the ampere hour rating of battery.
Car battery power monitor.
Indicates battery power in different level.
Self-Powered Fast Battery-Tester
Tests battery from 1.5 to 15 volt range
Resistance meter
Salt-Taster
Detects the amount of salt contained in a liquid food.
Digital Step Km Counter Max
This circuit measures the distance covered during a walk.
Digital distance meter
Use of microcontroller and LCD display
Digital Remote Thermometer
Consist separate receiver and transmitter unit for remote sensing.
DS1620 Based USB Digital Thermometer
Digital Thermometer
In the circuit
IC S8100 or the diode 1S1588 can be used as sensor.
Machine Vibration Activates Hour Meter
PC Based Thermometer 1
Using the circuit one can see the temperature display on PC monitor.
PC Based Thermometer 2
PC Based Thermometer 3
Thermostat
Thermistor used as sensor.
Wireless Tachometer
Measure speed of engine without any physical connection.
Seismometer
Microprocessor Based.
Light intensity monitor
Measures intensity of light, Includes PCB layout.
Light pollution meter
Ultrasonic Dog Wistle
Can be used to train dog with frequency 15-25 KHz
Ultrasonic transreceiver
Ultrasonic Motion Detector
Ultrasonic range finder
Uses single transmitter and receiver.
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