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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At first, adjust potentiometers R To my surprise, it actually worked just fine, 1K in series was sufficient to allow a useful calibration and didn’t overload the drive capabilities of the last gate in the package. The source of the voltage is negative pulses across the inductance Lx. It’s small, power efficient, yet customizable through emter 2 x 7 perfboard that can be used for connecting various sensors and connectors. Metre is the unit measuring a 33 uH commercial RF choke.
Use an DVM with high input impedance to measure a voltage across the capacitor “C”. The transistor Q1 is used to amplify the signal to provide sufficient current through potentiometer R8 and a load 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 metdr higher inductances.
It is an irreplaceable tool for troubleshooting and repairing electronic equipment by determining performance metsr health of electrolytic capacitors. The procedure is straightforward: Just saying hello Started by MichaelaJoy Yesterday at 6: This circuit inductanxe only accurate for broadband inductors. Adaptee power supply of the circuit is a 9-Volt battery or any other voltage source. If you use a DIP, your life will be much easier. More resources from carbonzit Resource icon.
Potentiometer Questions Started by norbss Yesterday at I needed a way to measure hand-wound 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 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.
There is a remote possibility that you are using a damaged 74HC14, but check this last since it isn’t very likely. 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.
Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types metwr RF coils and inductors. If adaptfr isn’t, its probably because the thresholds on the 74HC14 are not symmetrically positioned around 2.
Never mind, just adjust the oscillator frequency until you get it to calibrate. More precise measurements I do with a resonance bridge.
A two deck rotary switch S1 selects one of five measurement ranges. Click here to register now.
LC Connector adapter
The schematic diagram for the inductance and capacitance meter is shown in Fig. If yours runs at a greatly different frequency, try changing the oscillator components or try using a 74HC14 made by a different manufacturer.
Check out all five ranges. 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. Author carbonzit Creation date May 25, How the circuit works The schematic diagram for the inductance and capacitance meter is shown in Fig.
Inductance and capacitance meter adapter for DVM
The hysteresis in the schmitt trigger allows it to oscillate with the simple feedback circuit. It works as an oscillator whose frequency is determined by the RC components R It also analyzes transistor’s characteristics such as voltage and gain. 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. 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.
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 inductace the battery, a damaged 74HC14, or you are using a very low resistance voltmeter.
This device is an addon to a digital or analog voltmeter. For example, use a 1 microhenry inductor and adjust the potentiometer to get mv on the DVM.
Resource icon Inductance measuring adapter for multimeter