VU Meter with UAA180
This circuit of measurement of level uses the UAA180 of SIEMENS and a circuit of rectification of precision, round the IC2B. The calibration has become in steps...
Frequency meter 1KHz to 1MHz
This circuit is a frequency meter, low cost. It covers region 1HZ until 1MHZ. The IC1 schmitt trigger that it regulates the signal of entry and him changes in r...
Frequency counter up to 1MHZ
The MK50398 is one modern decimal counter up/down of six tens, with control of screen LED of seven segments and flip-flop of storage. Counter it can measure add...
Zener Diode checker
Many times we have found itself in the necessity to use a Zener diode and cannot to know the voltage of operation. Many times we cannot read the characteristics...
8 channel LCD Teperature meter ( RS232 - AT90S2313 )
This is the fully featured, jammed packed temperature readout unit. I can measure temperature from up at 8 DS1820 digital temperature sensors all on the same 1-...
Function Generator, capacitance and inductance meter
This site contains complete schematics and code for a 68HC11 based frequency counter, square wave synthesizer, sine wave synthesizer, programmable filter, capac...
Adjustable Attenuator for Oscilloscope
The input attenuator uses a commutating capacitor to cancel the input capacitance of the FET buffer (see DC-10 MHz amp schematic). The commutating capacitors ar...
Analog Switch for Oscilloscope
The analog switch multiplexes between channel 1 and channel 2 at the end of each sweep. Controls include Dual Trace/Single Trace mode, sync polarity, sync level...
Blanking Circuit for Oscilloscope
This circuit blanks the CRT starting just before retrace begins. Since the CRT sits at a -1200 volt potential, the blanking circuit must also be based at -1200 ...
Dual-trace, triggered oscilloscope
This site contains public-domain schematics for a dual-trace, triggered oscilloscope, and some theory. Click on the topic in the table below to see the schemati...
Analogue / Digital Logger II
This is a circuit monitoring device. It runs for over 10 days and can log up to 32k events both digital and analog. Samples are logged either on a timing basis ...
Simple analogue Tachometer
Basically, this is a frequency-current converter. It is used as frequency meter. Calibrating it can be used as tachometer. Please be aware this is an experiment...
Capacitance Meter ( 68HC711D3FN )
The proposed capacitance is a very powerful assembly to measure in 7 ranges
capacitors of 1 pF to 999 uF, avecune excellent precision of about 10 -3 .
The r...
2.5 GHz Frequency meter with 2x16 LCD display
This project explain a very powerful frequency counter which has many useful software functions. The software can add or subtract 3 different IF frequencies (±...
LC inductance / capacitance meter
LC-meter will work equally good with or without your knowledge about the theory. The LC meter is actually an LC oscillator based around the familiar comparator...
Frequency prescaler for multimeter up to 2.5GHz
This project will describe a prescaler which will work up to 2.5GHz and with very high input sensitivity. The prescaler will divide the input frequency with eit...
Digital Wattmeter for 0-500MHz with PIC16F870
This project will explain how I build my new wattmeter. This watt meter will be able to measure power from 300nW to 30W @ (0-500MHz). This wattmeter is based up...
Impedance meter for Headphones
This article has two parts. Part I describes a way to determine the effective average impedance of a pair of mono headphones or a speaker using a device called ...
Mini PC Digital Oscilloscope
This is a portable oscilloscope adapter that it can be held in breast pocket. Its operation is only sampling and sending to host PC. The most of functions of th...
frequency counter
The frequency counter is the most popular instrument in the home maid instruments. I think that the reason why it is built widely is: it can be built easily bec...