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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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I happned to have the 74HC14 in an SO package so I soldered it onto the metalized side of a prototyping board. The pulse frequency is set by a schmitt trigger oscillator meteg of a feedback resistance 2k pot and 3. The hysteresis in the schmitt trigger allows it to oscillate with the simple feedback circuit.

Inductance Meter

When it switched into position “L”, the measurement circuit operates as an inductance meter, see the Fig. C5 in feedback circuits. Resource icon Inductance measuring adapter for multimeter I calibrated my unit for uH, as this is the range I am generally most interested in, and it gives direct-readings on the uA scale of the meter.

Potentiometer Questions Started by norbss Yesterday at In order to get a pulse with a width that is substantiall longer than the rise and fall time of the schmitt trigger, whcih is a requiremnt for good linearity, while the inductance was in the nH range, I had to use a very low resistance, hence the three ohm resistors and their drivers in parallel. Click here to register now. If yours runs at a greatly different frequency, try changing the oscillator components or try using a 74HC14 made by a different manufacturer.


At first, adjust potentiometers R The transistor Q1 is used to amplify the signal to provide sufficient current through potentiometer R8 and a load circuit. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.

A two deck rotary switch S1 selects one of five measurement ranges. Here are some things to check when calibrating: Connect a battery and a DVM digital volt meterput a known inductor in the LX position then adjust the potentiometer until you get the anticipated reading on the DVM.

Real-Time ‘Stopwatch’ This is a simple electronic “stopwatch” you can use to time an event. Articles Top Articles Search resources. Inductance Meter In-Use The resolution of the analogue 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.

In the one I built I used a pair of alligator ineuctance soldered to stout wires a couple of cm long.

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More precise measurements I do with a resonance bridge. If not, you may have too much inductance in the leads to LX or have connected LX to a noisey ground point. 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.

This RC network operates as an integrator circuit. Headphone amplifier inductancee small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery. How adaptee circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig. A power supply of the circuit is a 9-Volt battery or any other voltage source. Never mind, just adjust the oscillator frequency until you get it to calibrate.


The output waveforms can be both amplitude and frequency modulated.

You can control lights, fans, AC system, computer, printer, amplifier, indductance, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think of. The voltage regulator provides 6-Volts stabilized voltage for the circuit. The procedure is straightforward: This circuit provides DC output voltage on the clamps X6, X7, and this voltage is directly proportional to the inxuctance of Lx.

It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance jeter health of electrolytic capacitors. 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.

This circuit is only accurate for broadband inductors. 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.