Turn your Digital Voltmeter into an Inductance and capacitance meter. Page 1. Page 2. Products 1 – 20 of 22 Source LCR Meter Accessories at ; the leading distributor of IT, Test Peak Electronic Design LLSm LCR Meter Adapter.

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It is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc. When it switched into position “L”, the measurement circuit operates as an inductance meter, see the Fig.

Inductance Meter

How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. When the switch S1 is in “C” position, it connects another diode into the circuit, making a voltage doubler rectifier circuit see the Figure 3. At first, adjust potentiometers R Never mind, just adjust the oscillator frequency until you get it to calibrate.

It can be connected to any type of stereo audio source such as iPod, Computer, Laptop, CD Player, Walkman, Television, Satellite Receiver, Tape Deck or other stereo system to transmit stereo sound with excellent clarity throughout your home, office, yard or camp ground. In the one I built I used a pair of alligator clips soldered to stout wires a couple of cm long.

This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors.

The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored.

The circuit relies on a voltmeter with a millivolt range and a high input impedance as a readout device, so it doesn’t have a buffer on the output. The schematic diagram for the inductance and capacitance meter is shown in Fig. The inductance tester converts the inductance value of the coil being tested to a voltage which can be measured by a voltmeter. When you built this, keep the connections, including gorund connections, short because tens of nanoseconds count.


Inductance and capacitance meter adapter for DVM

The output waveforms can be both amplitude and frequency modulated. Resource icon Inductance measuring adapter for multimeter This circuit provides DC output voltage on the clamps X6, X7, and this voltage is directly proportional to the inductance of Lx.

To participate you need to register. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Here are some things to check when calibrating: Potentiometer Questions Started by norbss Yesterday at C5 in feedback circuits. Author carbonzit Creation date May 25, Pay particular attention to the leads and contacts for LX.

The pulse frequency is set by a schmitt trigger oscillator composed of a feedback resistance 2k pot and 3.

Use an DVM with high input impedance to measure a voltage across the capacitor “C”. Simple Audio Signal Injector Here’s a signal injector for those of us like me who don’t have a bench full of nice test equipment. Media New media New comments Search media. Click here to register now.

I took this circuit from this page on the QRP Homebrew site and made some modifications to it, described below. If it isn’t, its probably because the thresholds on the 74HC14 are not symmetrically positioned around 2.

I needed a way to measure meteer RF inductors in my second lab, and since I would only be doing this occasionally, I didn’t need anything fancy, and since once a friend finishes his AT90Sbased design, I plan adpater make one myself, I figured I’d use this for less than a year, so I didn’t want to invest a lot of time in making it.

By continuing to use this site, you are consenting to our use of cookies. The Circuit The circuit’s operating principle is meher if you make a pulse width proportioal to inductance, and keep the pulse frequency and amplitude constant, and then pass the pulse through a low pass filter so that only the average voltage comes out, the resulting DC voltage is proportional to the inductance.


Inductance and capacitance meter adapter for DVM

It works as an oscillator whose frequency is determined by the RC components R Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. The procedure is straightforward: The voltage regulator provides 6-Volts stabilized voltage for the circuit. Forums New posts Search forums. The hysteresis in the schmitt trigger allows it to oscillate with the simple feedback circuit.

A power supply of the circuit is a 9-Volt battery or any other voltage source. The pulse width that is proportional to the inductance is made by drving the unknown inductance through a resistor and connecting the resultant sawtooth waveform to the input of another schmitt trigger which, because of the sharp switching action on its output that results from its hysteresis, provides a nice rectangualr pulse.

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Just saying hello Started by MichaelaJoy Yesterday at 6: Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter. Any inductance in that path will add to the measured inductance, so keep it short and small.

FOA – LC Connector adapter

You might have some trouble getting the thing to calibrate if the switching thresholds on your 74HC14 are very different from the one I used, so you might have to change the resistance in the osicllator inductaance the capacitor in order to claibrate the circuit. Check out all five ranges. The switch S2 is in position “C”.

There is a remote possibility that you are using a damaged 74HC14, but check this last since it isn’t very likely.