Owner: Test and Measurment Circuit URL:http://testmeasurementcircuit.blogspot.com/ Join Date: Fri, 31 Oct 2008 10:49:44 -0500 Rating:0 Site Description: Electronic Test and Measurement Schematic Circuits Collection Site statistics:Click here
Simple 2.5 GHz Frequency Counter 2008-07-10 14:46:04 The 2.5Ghz frequency counter project is very simple but has a great use. High frequencies are more important for radio amateur who are dealing with radio transmitters and receivers. This frequency counter have ability to subtract the incoming frequency by offset(10.7MHz or 455kHz), so Intermediate Frequency
of oscillator could be seen.As this frequency counter is built under PIC16F870, it can’t Read more:Counter
, Simple
Sound Pressure Level Meter 2008-07-10 14:41:24 This electronic circuit project is to setup home-cinema set adjusting all the loudspeaker outputs to the same level when heard from the listening position.In practice this device is a simple (though linear and precise) ac millivoltmeter, using an existing multimeter set to 50 or 100µA fsd with the probes connected to J1 and J2 to read the results.The precision of the measure is entirely depending Read more:Meter
, Pressure
, Sound
The Simplest Possible pH Meter 2008-07-10 13:41:28 Here's a schematic diagram for the simplest possible pH meter. Two 9-volt batteries power a high-input-impedance operational amplifier, such as a TL082. The pH probe is connected to the non-inverting input. The output voltage (V out), which is directly proportional to pH, is read with a voltmeter.How It WorksThe TL082 (or any other operational amplifier with a high impedance input) works as a unit Read more:Meter
, Possible
ESR and Low Ohms Meter 2008-07-10 12:10:54 If you repair switch-mode power supplies, TV receivers, computer monitors, vintage radios, or similar equipment, and/or if you need to measure very low values of resistance, this project can save you lots of time and aggravation - as it has for me. It measures an aspect of electrolytic capacitor performance which is very important, but normally very difficult to check: the equivalent series resis Read more:Meter
Audio Test Equipment - Pink Noise Generator 2008-07-05 22:27:46 This audio test equipment is for audio testing, a pink noise source is an invaluable tool. It is essentially a flat frequency response noise source, and will quickly show any anomolies in speaker systems, room acoustics and crossover networks.White noise (the sound you hear when a TV is tuned to a non-existent station) has a frequency characteristic which raises the power level by 3dB with each in Read more:Audio
, Equipment
, Generator
, Noise
Electronic Distance Meter 2008-06-30 11:03:56 This electronic circuit project is to measure distance while riding bicycle. Direct display in meter unit. Detection of rolling is made by proximity effect, when the magnet close to the reed switch. This close/open reed switch contact can use to make on-off signal. I chose MCU from Motorola, a 16-pin 68HC908QY4 for counting the pulse signal produced by reed switch.The MCU uses internal oscillator, Read more:Electronic
, Meter
Exclusive 2.5 GHz Frequency Counter 2008-06-30 10:43:03 A frequency counter is one of the most important measuring tool we need as homebrew's of RF electronic. This frequency counter has very high performance and still is very easy to build and to use. Anyone can build it and have a professional frequency measuring tool.The counter is based around a LCD display with 2 lines and 16 chars. I have used a HD44780 based display which is very common. A PIC16 Read more:Counter
, Exclusive
, Frequency
Infrared Remote Control Tester 2008-06-29 22:19:18 This is a fairly easy circuit that can be used to test TV and VCR remote controls. The infrared detector module (GP1U52X) (Radio Shack 276-137) produces a 5 volt TTL pulse train corresponding to the digital code of the particular remote control key pressed. In the lower circuit, the module output is normally low with no signal received and becomes a positive going pulse train when a signal is pres Read more:Control
, Infrared
, Remote
, Tester
In Circuit Transistor Checker 2008-06-29 04:23:33 This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the output power transistors on amplifier circuits.Circuit
operation is as follows. The 555 timer ( IC1 ) is set up as a 12hz multi vibrator. The output on pin 3 drives the 4027 flip-flop ( IC2). This flip-f Read more:Checker
Plant Moisture Meter 2008-06-29 04:19:08 Stick the metal probes into a freshly watered plant and adjust R5 for a mid-scale meter deflection. The meter will monitor the soil wetness and the meter will indicate whether it is to moist or to dry. This circuit uses a dual power supply which could be created by two 9 volt batteries.Source: Randy Linscott Read more:Meter
, Plant
Audible Logic Probe 2008-06-29 04:15:33 When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible.This probe is designed for TTL circuits only but could be modified for CMOS. The way it works is as follows. The 5 volt power source will be the circuit under test. Clip the ground input of the probe to the ground of the circu Read more:Logic
, Probe
Audio VU Stereo Meter 2008-06-28 11:36:50 This project will indicate the volume level of the audio going to your speakers by lighting up LEDS. The LEDS can be any color so mix them up and really make it look good. The input of the circuit is connected to the speaker output of your audio amplifier.You want to build two identical units to indicate both right and left channels. The input signal level is adjusted by the 10k ohm VR. If you wis Read more:Audio
, Meter
, Stereo
Milligauss Meter Circuit 2008-06-28 11:02:12 The circuit provides an easy yet reliable way to detect the intensity of a.c. (or e.l.f.) fields around the home or workplace. It is doubly effective because it does not merely detect the electromagnetic radiation emitted by electrical appliances, but the electromagnetic energy actually absorbed by the body.The circuit in is a standard charge pump which is charged by the alternating eddy currents Read more:Circuit
, Meter
UTP Cable Tester 2 2008-06-28 10:52:54 The UTP CableTester
can be used for many purposes. Mainly to test a UTP network cables of course. However it can also be used to find the right cable in a large bundle of identical looking cables. In fact the circuit can be used or adapted to test any type of cable of any number of wires, provided that the tester is equipped with the appropriate connectors.The UTP Cable Tester consists of 2 tiny
A Simple UTP Cable Tester 2008-06-28 09:58:29 The circuit below is designed so that when the ends of a UTP cable are plugged into each of the "RJ45 Sockets", the circuit for each pair is completed and the LEDs light up. If there is a break in a wire (or the leads are incorrectly terminated) the corresponding LED will not light. For remote testing (where you can't get at both ends) cut the board apart and plug the "terminator" section into one Read more:Cable
, Simple
, Tester
Microwave SWR Meter 2008-06-17 01:15:05 Basically it consists of 2 pieces of UT141 semi rigid coax. On both pieces of semi rigid coax, a slot of around 30mm in length is filed to expose the centre conductor. The slot width is about 2mm. The two slots, one on each coaxial cable are then put together, such that the transmission lines are parallel, and soldered along the full length on both sides. Make an effort to solder properly. The 30m Read more:Meter
Power and SWR Meter 2008-06-17 01:03:12 The Power and SWR Meter
kit, is a handy accessory for both station and field use, designed by Steve "Melt Solder" Weber KD1JV. It is a self contained power meter and SWR indicator for 50 Ohm coaxial transmission lines.With this device, you can measure the output power of your QRP transmitter and the SWR on the transmission line to your antenna. Frequency coverage is all amateur bands from 160 to
Privacy Policy 2008-06-10 06:53:02 Privacy Policy
for Test and MeasurementIf you require any more information or have any questions about our privacy policy, please feel free to contact us by email at ecircuits@telkom.net.At Test and Measurement Blog, the privacy of our visitors is of extreme importance to us. This privacy policy document outlines the types of personal information is received and collected by Test and Measurement B Read more:Privacy
, Privacy Policy
Simple RF Probe 2008-10-31 12:24:17 This simple RF probe can be used to determine if the oscillator is working. It will not tell you the frequency (you need a good RF frequency counter for that), but at least you will know if it is oscillating or not.
This RF probe is useful for any low level RF work, and simply connects to your multimeter. The voltage shown will not be accurate, since this is a rectifier probe, but the measurem Read more:Probe
, Simple
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