magnetics application schematics
Calibrate the measurement circuit by forcing a known conductor current and measuring the resulting voltage output. If sensor to conductor displacement changes, ...
lf253 Frequency counter 1Hz-100Mhz with LCD display and RS232 interface
This article continues the AT90S4433 Microcontroller series. I suggest you to read the previous articles on Atmel Microcontroller programming with regards to: T...
lf365 A digital thermometer or talk I2C to your atmel microcontroller
The Atmega8 microcontroller from Atmel has plenty of digital and analog input/output lines. It is the ideal device to develop any kind of measurement equipment....
USB-DUX
The input range of the USB-DUX sigma board (+/-1. 35V) matches perfectly the output voltage range of the LM35. GND is available on many pins on the HD connector...
Potentiometric voltmeter
The potentiometer value is not critical: anything from 1 k © to 100 k © is acceptable. If you have built the "precision potentiometer" described earlier in th...
Sensitive voltage detector
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Ohms Law
Restricting the resistance values between 1 k © and 100 k © for the sake of obtaining accurate voltage and current readings with your meter. With very low res...
Flash ADC
Also called the parallel A/D converter, this circuit is the simplest to understand. It is formed of a series of comparators, each one comparing the input signal...
Meter check of a diode
Being able to determine the polarity (cathode versus anode) and basic functionality of a diode is a very important skill for the electronics hobbyist or technic...
Video Tracer For Trouble-Shooting
This circuit was designed as an aid to installers and maintainers of video systems. It is basically a video sync separator (IC1) followed by a LED and buzzer dr...
Spike Detector For Oscilloscopes
Dynamic‚ip-‚ops ignore pulses at their inputs that are shorter than 40 ns or do not have TTL levels. This means that TTL flip-flops are poorly suited to cap...
relative field strength meter
Many passive field strength meters have appeared in the past, typically using a 50mA analog meter movement if reasonable sensitivity was to be obtained. This ci...
Quick On-Board Junction TesterCircuit
Short circuits or broken pcb tracks can be easily recognized by means of a Multimeter, but this tool can give wrong results when testing the efficiency of a tra...
Optical Pulse Generator
This little aid was originally designed to test the Shutter Time Meter. This meter was specifically designed for analogue` SLR cameras. In order to measure the ...
Maximum Minimum Voltage Indicator
This circuit indicates which of three voltages in the range from about about -4V to about +4V - at A, B and C - is the highest by lighting one of three indicato...
Mains Frequency Monitor
Here is a simple frequency counter designed to monitor the 240VAC mains supply. It as a frequency range of 0-999Hz, so it could also be used with 400Hz equipmen...
Low Ohms Adaptor For DMMs Based On An LM317 Regulator
This adaptor circuit is essentially a 100mA constant current source. It is applied across a low-value resistor of unknown value (ie, the resistance to be measur...
LED Volt Meter
Here is a Simple LED Volt meter to Monitor the charge level in Lead Acid Battery or Tubular battery. The terminal voltage of the battery is indicated through a ...
Four-Channel Oscilloscope Adaptor
This circuit enables you to display four signals simultaneously using only one channel of your oscilloscope. Essentially, it switches each of the inputs through...
Floating 9V Supply For DVM Modules
Most commercial DVM modules with an LCD readout are 9-V powered and based on an ICL7106 or similar A-D converter chip. These modules are typically used in labor...