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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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. Inductors with iron cores, high permeability ferrites, or with large amonts of shunt capacitance cannot be measured accurately. If you use a DIP, your life will be much easier. The last inverter in merely to make the pulse positive in polarity so that indcutance voltage increases as the inductance increases.

If yours runs at a greatly different frequency, try changing the oscillator components or try using a 74HC14 made by a different manufacturer. The circuit includes an auto ranging as well as reset switch and produces very accurate and stable readings.

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MFJ Enterprises Inc.

For example, use a 1 microhenry inductor and metdr the potentiometer to get mv on the DVM. There is a way to check out the duty cycle at the collector of Q1. Never mind, just adjust the oscillator frequency until you get it to calibrate.

Check out all five ranges.

This circuit is only accurate indutcance broadband inductors. Potentiometer Questions Started by norbss Yesterday at adapted If not, then match the value of the resistor R7 to make shape of the signal as close to square wave as possible. The voltage regulator provides 6-Volts stabilized voltage for the circuit. I had run across the forerunner of this circuit, one that is more sophisticated in that it has a zero adjustment and range switch, but it was limited to higher inductances.


It also analyzes transistor’s characteristics such as voltage and gain. I needed a way to measure hand-wound RF inductors inductxnce 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 to 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.

FOA – LC Connector adapter

This circuit provides DC output voltage on the clamps X6, X7, and this voltage is directly proportional to the inductance of Lx. A two deck rotary switch S1 selects one of five measurement ranges. It’s small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors. It works as an oscillator whose frequency is determined by the RC components R 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 or the capacitor in order to claibrate the circuit.

Author carbonzit Creation date May 25, You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of. By continuing to use this site, you are consenting to our use of cookies. This device is an addon to a digital or analog voltmeter. Inductance and capacitance meter adapter for DVM This device is an addon to a digital or analog voltmeter.


The source of the voltage is negative pulses across the inductance Lx. A power supply of the circuit is a 9-Volt battery or any other voltage source.

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. The switch S2 is in position “L”. The pulse width is proportional to the inductance and inversely proportional to the resistance.

The switch S2 is in position “C”. At first, adjust potentiometers R The procedure is straightforward: Inductance Meter In-Use The resolution of the metdr meter obviously limits its performance, but I generally use it to just ensure I am in the right ballpark while winding coils or picking from the junk box.

LC Connector adapter

When you built this, keep the connections, including gorund connections, short because tens of nanoseconds count. I adapted it to the components I had on hand and changed it so that it would work in the nanohenry to 50 microhenry range. I calibrated my unit for uH, as this is the range I ada;ter generally most interested in, and it gives direct-readings on the uA scale of the meter.