Digital Remote Thermometer circuit
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage, which...
Digital Voltmeter circuit
The ICL7107 is a 3 1/2 digit LED A/D convertor. It contains an internal voltage reference, high isolation analog switches, sequential control logic, and the dis...
Analog Milliamp Meter Used as Voltmeter circuit
A milliamp meter can be used as a volt meter by adding a series resistance. The resistance needed is the full scale voltage reading divided by the full scale cu...
Field-strength meter circuit
You can`t expect great performance from such a simple detector-based meter. Sensitivity is just adequate enough to get a basic idea of the power that your trans...
Battery Tester Circuit
Is the battery empty, or is there something wrong with the device That`s always a difficult question when your walkman or some other battery-powered device appe...
Digital Step-Km Counter Circuit
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the follow...
PIC Freq Counter
A prescaler attached to a PIC to get a simple frequency counter. I would suspect that it would just become a "module" that I include in some other design projec...
sonar
The receiving systems used with the scanning type of echo-ranging equipments are of the dual-channel type, which is required in present methods of video portray...
Electromagnetic Field Probe with Meter Output
This tester is designed to locate stray electromagnetic (EM) fields. It will easily detect both audio and RF signals up to frequencies of around 100kHz. Note, h...
Digital Remote Thermometer
This circuit is intended for precision centigrade temperature measurement, with a transmitter section converting to frequency the sensor`s output voltage propor...
Digital Radar Speedometer
This circuit is a Digital Radar Speedometer. It allows us to evaluate the speed of any object moving, especially cars and other vehicles. The speed is calculate...
Oscilloscope testing module (huntron circuit)
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Led display digital Voltmeter
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Digital Voltmeter
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Linear Resistance Meter
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Digital Step-Km Counter
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the follow...
Channel Imbalance in DAC
Tested all the resistors and noted 2 resistors` readings were out compared to the other channel (i. e.1. 2Kohm vs 2. 2 kohm). Based on the color codes, should b...
Smiths Tachometer
Calibrating the Smiths electronic tachometer some time ago when I realized that my tach was completely out of calibration. I used a technique similar to the one...
NSH Field Strength Meter
A well tuned antenna system works like a dummy load, i. e. the SWR is 1. 2:1 or below but the hunting range is low. What`s wrong Insufficient radiation How to k...
LCD Frequency Counter Using PIC
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