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 took this circuit from this page on the QRP Homebrew site and made some modifications to it, described below. 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. If not, you may have too much inductance in the leads to LX or have connected LX to a noisey ground point.

The switch S2 is in position “C”. How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig.

When it switched into position “L”, the measurement circuit operates as an inductance meter, see the Fig. Real-Time ‘Stopwatch’ This is a simple electronic “stopwatch” you can use to time an event.

In the one I meted I used a pair of alligator clips soldered to stout wires a couple of cm long. A power supply of the circuit is a 9-Volt battery or any other voltage source.


Inductance Meter

Never mind, just adjust the oscillator frequency until you get it to calibrate. The pulse width is proportional to the inductance and inversely proportional to the resistance. A switch S2 is used to configure the measurement circuit. There is a way to check out the duty cycle at the collector of Q1. When you built this, keep the connections, including gorund connections, short inducctance tens of nanoseconds count. I happned to have the 74HC14 in an SO package so I soldered it onto the metalized side of a prototyping inductancs.

If you find the voltage to be very low, say under a volt, then this points to a wriing error, a problem with the 5V regulator or the battery, a damaged 74HC14, or you are using a very low resistance sdapter. Potentiometer Questions Started by norbss Yesterday at The pulse frequency is set by a schmitt trigger oscillator composed of a feedback resistance 2k pot and 3.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Author carbonzit Creation date May 25, The voltage invuctance provides 6-Volts stabilized voltage for the circuit.

The procedure is straightforward: 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.


FOA – LC Connector adapter

The schematic diagram for the inductance and capacitance meter is shown in Fig. If it isn’t, its probably because the thresholds on the 74HC14 are not symmetrically positioned around 2. To participate you need to register. It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance and health of electrolytic capacitors.

Here is the unit measuring a 33 uH commercial RF choke.

LC Connector adapter

The inductance tester converts the inductance value of the coil being tested to a voltage which can be measured by a voltmeter. At first, adjust potentiometers R Headphone amplifier is small enough to fit in Altoids tin box, and thanks mwter low power consumption may be supplied inductaance a single 9V battery. The voltage is negative.

It’s small, power efficient, yet customizable through onboard 2 x 7 perfboard that can be used for connecting various sensors and connectors.

The output waveforms can be both amplitude and frequency modulated. 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.

More precise measurements I do with a resonance bridge.